EAP® Abutments – Scientific Research Database

Problem: Suboptimal prosthetic designs may promote plaque accumulation and inflammation, even in compliant patients.

Purpose: To review the biological and clinical relevance of prosthetic design, specifically the emergence profile and restorative angle in influencing peri-implant tissue health.

Methods: Narrative review synthesizing current evidence on the anatomy and function of the implant supracrestal complex, with clinical case report.

Results: Concave, polished emergence profiles on adequately tall titanium bases promote soft tissue stability, facilitate hygiene, and minimize inflammation or recession risk.

Conclusions: Restorative angle and emergence profile are critical, modifiable elements of implant-supported prostheses. A biologically oriented approach is essential for achieving predictable and esthetically successful outcomes.

Problem: Traditional abutment planning does not consider all aesthetic parameters.

Purpose: Development and validation of an AI algorithm for aesthetic abutment planning.

Methods: Comparison of 200 AI-planned vs. conventionally planned abutments.

Results: AI planning achieved 28% better aesthetic scores according to Pink Esthetic Score.

Conclusions: AI algorithms can significantly improve aesthetic planning of abutments.

Problem: Repeated disconnection and reconnection of abutments leads to bone loss and soft tissue disturbance.

Purpose: Description of a digital workflow technique for customized immediate abutments.

Methods: Clinical case documentation with digital design and CAD/CAM fabrication.

Results: Successful integration with optimal soft tissue aesthetics in immediate restoration.

Conclusions: The 'One Customized Abutment One Time' concept optimizes digital workflows and biological outcomes.

Problem: The optimal timing of definitive abutment placement is not clinically established.

Purpose: Randomized study on the influence of abutment height and placement timing.

Methods: 12-month follow-up with radiographic measurement of marginal bone loss.

Results: Early definitive abutment placement and optimal height significantly reduce marginal bone loss.

Conclusions: Immediate definitive abutment provision shows clinical advantages regarding marginal bone preservation.

Problem: A weak soft tissue seal increases the risk of implant failure.

Purpose: Review of strategies to improve soft tissue attachment at the implant abutment.

Methods: Analysis of adhesion-promoting, antibacterial and immunomodulatory surface treatments.

Results: Combined strategies (topography + bioactivity + antimicrobial properties) are most effective.

Conclusions: Advanced surface modification can significantly reduce peri-implant diseases.

Problem: The superiority of customized healing abutments is not systematically documented.

Purpose: Systematic comparison of customized and standard healing abutments.

Methods: Systematic review according to PRISMA with meta-analysis of clinical studies.

Results: Customized abutments show better soft tissue stability and esthetic results.

Conclusions: Patient-specific abutments show advantages in soft tissue stability and esthetic outcomes.

Problem: Repeated connecting and disconnecting of abutments can cause tissue damage and bone loss.

Purpose: Prospective analysis of the One-Abutment-One-Time protocol vs. conventional approach.

Methods: Multicenter RCT with 120 patients, follow-up over 12 months.

Results: Significantly less crestal bone loss in the One-Abutment-One-Time group (0.18 mm vs. 0.52 mm).

Conclusions: One-Abutment-One-Time significantly reduces bone loss and should be considered standard.

Problem: Peri-implant mucosal stability depends on abutment strategy.

Purpose: Review of the influence of definitive abutments on mucosal stability.

Methods: Systematic literature analysis of 18 studies.

Results: Definitive abutment at insertion shows better mucosal adaptation.

Conclusions: One-abutment-one-time is beneficial for mucosal stability.

Problem: Repeated abutment changes can affect peri-implant tissue stability.

Purpose: Quantification of the influence of abutment changes on bone and soft tissue.

Methods: Prospective study with radiographic and clinical follow-up.

Results: Each abutment change led to an average of 0.1 mm additional bone loss.

Conclusions: Minimizing abutment changes is essential for bone preservation.

Problem: Screw holes in crowns can compromise aesthetics.

Purpose: Evaluation of different techniques for screw hole coverage.

Methods: Clinical study with 80 screw-retained restorations.

Results: Composite fillings with layered build-up showed the best aesthetics.

Conclusions: Screw-retained restorations with proper coverage achieve excellent aesthetics.

Problem: Provisionals play an important role in soft tissue shaping.

Purpose: Overview of techniques for tissue conditioning with provisionals.

Methods: Narrative review of clinical protocols.

Results: Dynamic adjustment of provisionals enables optimal soft tissue architecture.

Conclusions: Provisionals are essential for predictable aesthetic outcomes.

Problem: Conventional impressions can lead to inaccuracies.

Purpose: Comparison of digital and conventional impression techniques for abutments.

Methods: Randomized study with 40 implants.

Results: Digital impressions showed comparable precision with reduced treatment time.

Conclusions: Digital impression is an efficient alternative for abutment fabrication.

Problem: Unfavorable crown-implant ratios can cause biomechanical problems.

Purpose: Analysis of the influence of crown-height-to-implant-length ratio on treatment success.

Methods: Retrospective study with 576 implants over 5 years.

Results: No significant correlation between crown-implant ratio and implant failure.

Conclusions: Short implants with tall crowns can be successful with good planning.

Problem: Abutment height can influence marginal bone loss.

Purpose: Investigation of the relationship between abutment height and bone loss.

Methods: Retrospective analysis of 238 implants with different abutment heights.

Results: Abutments under 2 mm height showed significantly more bone loss.

Conclusions: Adequate abutment height (≥2 mm) is important for bone preservation.

Problem: Cement-retained crowns can cause biological complications.

Purpose: Investigation of prevalence of cement residue and its effects.

Methods: Retrospective analysis of 150 implant-supported crowns.

Results: 63% of crowns with subgingival margins showed cement residue.

Conclusions: Subgingival crown margins significantly increase the risk of cement residue.

Problem: The influence of abutment material on peri-implant mucosa is unclear.

Purpose: Systematic review on the influence of abutment materials on soft tissue.

Methods: Analysis of 23 clinical studies.

Results: Titanium and zirconia showed comparable mucosal responses.

Conclusions: Titanium and zirconia are both suitable for peri-implant soft tissue stability.

Problem: The surface texture of abutments influences soft tissue response.

Purpose: Comparison of fibroblast attachment on different abutment surfaces.

Methods: In vitro study with cell cultures on polished, sandblasted, and laser-treated surfaces.

Results: Laser-treated surfaces showed the best fibroblast attachment.

Conclusions: Surface modifications can optimize soft tissue integration.

Problem: The anterior region requires highest aesthetic standards in immediate implantation.

Purpose: Evaluation of the one-abutment-one-time protocol in the aesthetic zone.

Methods: Prospective study with 35 anterior immediate implants and definitive abutments.

Results: 97% of cases achieved excellent aesthetic outcomes after 2 years.

Conclusions: The one-abutment-one-time protocol is very well suited for the anterior region.

Problem: Platform switching could reduce marginal bone loss.

Purpose: Meta-analysis on the effect of platform switching on bone preservation.

Methods: Systematic review of 10 studies with 1,240 implants.

Results: Platform switching reduced marginal bone loss by 0.37 mm.

Conclusions: Platform switching is beneficial for bone preservation.

Problem: The emergence profile can influence peri-implant mucosal height.

Purpose: Investigation of the relationship between emergence profile and mucosal height.

Methods: Retrospective analysis of 45 implants with different emergence profiles.

Results: Concave profiles showed more stable mucosal height than convex.

Conclusions: Emergence profile design influences long-term mucosal stability.

Problem: Crestal bone loss around implants remains a clinical problem.

Purpose: Meta-analysis on the effectiveness of platform switching on bone preservation.

Methods: Systematic review and meta-analysis of 10 clinical studies.

Results: Platform switching reduced crestal bone loss by an average of 0.37 mm.

Conclusions: Platform switching is effective for minimizing crestal bone loss.

Problem: The safety of immediate loading with definitive abutments is questionable.

Purpose: Cochrane review on the effectiveness of immediate loading protocols.

Methods: Meta-analysis of 26 randomized controlled trials.

Results: No significant difference in implant survival rates.

Conclusions: Immediate loading with definitive abutments is safe in suitable cases.

Problem: Papilla recession is a common aesthetic problem after implantation.

Purpose: Analysis of papilla preservation in immediate implantation with definitive abutments.

Methods: Prospective study with 20 patients and 2-year follow-up.

Results: 95% of papillae remained completely preserved with definitive abutments.

Conclusions: Definitive abutments in immediate implantation optimize papilla preservation.

Problem: Soft tissue contour after immediate loading is difficult to predict.

Purpose: Investigation of soft tissue development with immediate provisionals.

Methods: Prospective study with 46 immediate implants and soft tissue measurements.

Results: Gradual adjustment of the provisional optimized soft tissue contour.

Conclusions: Immediate provisionals enable active soft tissue shaping.

Problem: The long-term stability of zirconia abutments is clinically relevant.

Purpose: Systematic review on long-term performance of zirconia abutments.

Methods: Analysis of 29 studies with a total of 1846 zirconia abutments.

Results: 5-year survival rate of 99.1% for zirconia abutments.

Conclusions: Zirconia abutments show excellent long-term stability.

Problem: Mucosal thickness influences abutment show-through.

Purpose: Investigation of the relationship between mucosal thickness and abutment visibility.

Methods: Clinical study with 60 patients and spectrophotometric analysis.

Results: With mucosa under 2 mm, titanium became visible; zirconia remained unnoticeable.

Conclusions: Zirconia abutments are aesthetically superior in thin mucosa.

Problem: The color stability of zirconia abutments is relevant for long-term aesthetics.

Purpose: Evaluation of color stability of different abutment materials.

Methods: Spectrophotometric analysis after artificial aging.

Results: Zirconia showed superior color stability compared to plastic abutments.

Conclusions: Zirconia offers long-term color stability for aesthetic restorations.

Problem: The choice between customized and prefabricated abutments is clinically relevant.

Purpose: Comparison of clinical outcomes of customized and prefabricated abutments.

Methods: Prospective study with 65 implants over 3 years.

Results: Customized abutments showed better soft tissue aesthetics.

Conclusions: Customized abutments offer advantages in demanding aesthetic situations.

Problem: The influence of provisional abutments on soft tissue healing is unclear.

Purpose: Comparison of soft tissue response to provisional and definitive abutments.

Methods: Randomized controlled study with 40 patients.

Results: Definitive abutments showed more stable soft tissue conditions.

Conclusions: Avoiding abutment changes optimizes soft tissue outcome.

Problem: Evaluation of mucosal aesthetics requires standardized parameters.

Purpose: Development of the Pink Esthetic Score for evaluating peri-implant soft tissues.

Methods: Validation study with 30 implants and expert evaluation.

Results: The PES showed high inter-rater reliability.

Conclusions: The PES is a valid instrument for evaluating peri-implant aesthetics.

Problem: Three-dimensional implant position influences aesthetic outcome.

Purpose: Analysis of positioning parameters for optimal aesthetics.

Methods: Review of clinical studies and case series.

Results: Bucco-palatal and apico-coronal position are critical for aesthetics.

Conclusions: Precise implant positioning is prerequisite for aesthetic success.

Problem: Incorrect implant positioning leads to aesthetic compromises.

Purpose: Guidelines for optimal 3D implant positioning.

Methods: Consensus review based on expert opinion and literature.

Results: Clear parameters for mesiodistal, buccolingual, and apicocoronal positioning defined.

Conclusions: Precise 3D positioning is a prerequisite for predictable aesthetics.

Problem: Aesthetic outcomes in immediate restoration are not predictable.

Purpose: Analysis of aesthetic results in immediate implantation with definitive restoration.

Methods: Prospective study with 35 patients and Pink Esthetic Score.

Results: 85% of cases showed excellent aesthetic results.

Conclusions: Definitive abutments in immediate restoration enable predictable aesthetics.

Problem: Standard abutments offer limited aesthetic possibilities.

Purpose: Evaluation of CAD/CAM-fabricated custom titanium abutments.

Methods: Prospective 5-year study with 47 patients.

Results: 98% survival rate with excellent aesthetic results.

Conclusions: CAD/CAM abutments offer precise and aesthetically optimal solutions.

Problem: Fit accuracy influences long-term implant prognosis.

Purpose: Comparison of fit accuracy of CAD/CAM vs. conventionally fabricated abutments.

Methods: Measurements of marginal fit accuracy in 50 abutments.

Results: CAD/CAM abutments showed significantly better fit accuracy.

Conclusions: Digital fabrication optimizes abutment fit accuracy.

Problem: Biological width establishes based on abutment design.

Purpose: Investigation of factors influencing biological width.

Methods: Histological analysis of different abutment configurations in dogs.

Results: Conical abutment connections showed less bone loss.

Conclusions: Abutment design influences peri-implant tissue stability.

Problem: Soft tissue contour influences the final aesthetic result.

Purpose: Techniques for soft tissue shaping with provisional restorations.

Methods: Clinical case series with 25 patients.

Results: Gradual adjustment of provisionals optimized papilla shape.

Conclusions: Provisional restorations are essential for soft tissue optimization.

Problem: Repeated abutment changes can cause bone resorption.

Purpose: Quantification of bone loss with repeated abutment changes.

Methods: Animal study in dogs with histomorphometric analysis.

Results: Each abutment change led to 0.5-1 mm bone resorption.

Conclusions: Minimizing abutment changes is essential for bone preservation.

Problem: Tissue engineering offers new approaches for implant integration.

Purpose: Review of tissue engineering principles for implantology.

Methods: Conceptual analysis and literature review.

Results: Biomaterials can specifically promote tissue regeneration.

Conclusions: Surface modifications of abutments can optimize tissue healing.

Problem: Angled abutments can alter load distribution on the implant.

Purpose: Finite element analysis of stress distribution at different abutment angles.

Methods: Computer simulation with 0°, 15°, and 25° angled abutments.

Results: Higher angulation increased stress concentration at the bone-implant interface.

Conclusions: Abutment angulation should be minimized to reduce biomechanical stress.

Problem: Screw loosening is a common technical complication in implants.

Purpose: Analysis of factors contributing to screw loosening.

Methods: In vitro tests with different torque protocols.

Results: Correct tightening torque and retightening after 10 minutes reduced loosening.

Conclusions: Standardized torque protocols are essential for screw stability.

Problem: New materials require updated biocompatibility assessments.

Purpose: Comparative analysis of cell responses to titanium, zirconia, and PEEK abutments.

Methods: Culture of fibroblasts and epithelial cells on different abutment surfaces.

Results: Titanium showed optimal cell attachment, zirconia comparable, PEEK reduced.

Conclusions: Titanium and zirconia remain gold standard for soft tissue integration.

Problem: The cytotoxicity of different methacrylate monomers is not fully classified.

Purpose: Comprehensive review of the cytotoxicity of dental resins.

Methods: Systematic literature analysis focusing on in vitro cytotoxicity studies.

Results: Bis-GMA > UDMA > TEGDMA > HEMA toxicity ranking confirmed.

Conclusions: Methacrylate exposure to tissue should be minimized. Titanium surfaces can serve as a protective barrier.

Problem: BPA release from composites remains a health concern.

Purpose: Quantification of BPA release from current composite generations.

Methods: HPLC analysis of 25 modern composite materials under clinical conditions.

Results: 70% of tested materials showed measurable BPA release in the first 24h.

Conclusions: BPA-free alternatives should be prioritized.

Problem: Different measurement methods provide different values for the degree of conversion.

Purpose: Comparison of microhardness, FTIR and DSC for measuring degree of conversion.

Methods: Three dental composites were examined with three different analytical methods.

Results: Significant differences between surface and depth curing. Residual monomer can cause postoperative discomfort.

Conclusions: Inadequate polymerization leads to release of residual monomers with potential biological consequences.

Problem: The biocompatibility of dental composites is increasingly subject to scientific investigation.

Purpose: Systematic review of cytotoxicity studies from 2017-2023.

Methods: Analysis of 14 in vitro studies on human and murine cell lines using MTT, LDH and WST-1.

Results: Dose- and time-dependent cytotoxicity demonstrated. Oxidative stress and glutathione depletion are main mechanisms.

Conclusions: Current evidence confirms biological risks of dental composites - further material development is necessary.

Problem: Bisphenol A (BPA) is a known endocrine disruptor found in many materials.

Purpose: Comprehensive analysis of endocrine toxicity of BPA and related substances.

Methods: Systematic literature analysis on hormonal effects of BPA in various tissues.

Results: BPA disrupts thyroid, reproductive and metabolic function even at low doses.

Conclusions: Exposure to BPA-containing materials should be minimized - including in medicine.

Problem: 3D-printed prostheses are becoming more common - their biocompatibility is not sufficiently studied.

Purpose: Comparison of cytotoxicity of 3D printing resins with conventional PMMA according to ISO-10993-5.

Methods: MTT assay on L929 fibroblasts with extracts from various materials.

Results: 3D printing resins showed higher cytotoxicity than conventional PMMA.

Conclusions: Special care is required with 3D-printed provisionals - post-processing and cleaning are essential.

Problem: The influence of curing modes on gingival toxicity is unclear.

Purpose: Investigation of cytotoxicity and inflammatory response with different curing modes.

Methods: In vitro exposure of gingival cells to different cement formulations.

Results: Incompletely cured cements show significantly higher cytotoxicity and inflammatory markers.

Conclusions: Cement exposure to soft tissue should be minimized to reduce inflammatory reactions.

Problem: The toxic effects of resin-matrix cements are not fully characterized.

Purpose: Systematic analysis of cytotoxicity on fibroblasts and mesenchymal cells.

Methods: PubMed search, 277 articles identified, 21 included in review.

Results: Toxicity order: Bis-GMA > UDMA > TEGDMA > HEMA.

Conclusions: Monomer release causes cytotoxic reactions.

Problem: Bisphenol analogues are widespread. Effects on pregnancy are concerning.

Purpose: Investigation of bisphenol analogue toxicity during pregnancy.

Methods: Comprehensive literature search for epidemiological studies in humans.

Results: Significant association between bisphenol toxicity and recurrent miscarriages.

Conclusions: First comprehensive compilation of human studies on bisphenol toxicity.

Problem: The cytotoxicity of resin cements is not fully characterized.

Purpose: Investigation of cytotoxicity and antioxidative gene expression.

Methods: RelyX Ultimate, Variolink II, and RelyX U200 applied to hGF.

Results: Reduction of viable cells. All resin cements induced antioxidative genes.

Conclusions: Antioxidative gene induction is linked to cytotoxicity.

Problem: Temporary restorations from different manufacturing processes differ in their monomer release.

Purpose: Comparison of monomer release from 3D-printed, CAD/CAM-milled and conventional provisionals.

Methods: HPLC analysis of monomer elution over 28 days in artificial saliva.

Results: 3D-printed materials showed significantly higher residual monomer release than milled materials.

Conclusions: Post-processing and thorough cleaning are essential for 3D-printed provisionals to minimize toxicity.

Problem: The biocompatibility of resin provisionals on implants is not systematically evaluated.

Purpose: Systematic review of biocompatibility and peri-implant reactions.

Methods: PRISMA-compliant analysis of 28 studies on provisional materials.

Results: PMMA-based materials showed better biocompatibility than bis-acryl.

Conclusions: Material choice significantly influences peri-implant tissue response.

Problem: The release of BPA from resin-matrix composites is concerning.

Purpose: Systematic review of BPA release and toxicity.

Methods: PubMed search for in vitro and in vivo studies.

Results: BPA is released through incomplete polymerization and degradation.

Conclusions: BPA release depends on matrix composition and polymerization method.

Problem: Composites come into direct contact with gingival tissue and can be cytotoxic.

Purpose: Comparison of cytotoxicity of various commercially available composites.

Methods: MTT test and Alamar Blue assay with human gingival fibroblasts (HGF).

Results: All tested composites showed significant cytotoxic effects - with varying intensity.

Conclusions: The choice of composite affects biocompatibility - direct tissue contact should be minimized.

Problem: Epigenetic changes from dental resin monomers are poorly studied.

Purpose: Review of epigenetic effects of dental resin monomers.

Methods: Literature search on DNA methylation, histone modification, and miRNA.

Results: Monomers can alter DNA methylation patterns.

Conclusions: Epigenetic effects of dental resin monomers require further research.

Problem: Methacrylate monomers show toxicity to gingival cells.

Purpose: Investigation of the toxicity of Bis-GMA, UDMA, TEGDMA on human gingival cells.

Methods: In vitro study with human gingival cells. Analysis of oxidative stress.

Results: Toxicity in the order Bis-GMA > UDMA > TEGDMA.

Conclusions: Bis-GMA and UDMA cause glutathione depletion and cell death.

Problem: Directly fabricated provisionals release monomers that can cause mucosal reactions.

Purpose: Clinical evaluation of mucosal reactions to direct provisionals.

Methods: Prospective study in 40 patients with direct implant provisionals.

Results: Increased incidence of mucositis with direct fabrication vs. indirect.

Conclusions: Indirect fabrication of provisionals is gentler on mucosa.

Problem: The degree of conversion of dental composites varies considerably and influences residual monomer release.

Purpose: Measurement of degree of conversion and residual monomers in experimental and commercial composites.

Methods: FTIR-ATR and HPLC-UV analysis of 6 composite materials after light curing.

Results: Degree of conversion between 35-77%. Two experimental materials showed less than 1% residual monomers.

Conclusions: 23-65% of monomers remain unpolymerized and can be released into tissue.

Problem: BPA can be released from resin-based dental materials. Actual amounts are unclear.

Purpose: Quantification of BPA release from various dental materials.

Methods: UPLC-MS-MS analysis of 4 composites, 3 sealants, and 2 bonding materials after 24h and 2 weeks.

Results: Tetric EvoFlow® and DELTON® showed significantly higher BPA release. No differences between 24h and 2 weeks.

Conclusions: BPA continues to be released from some dental materials – despite health risk concerns.

Problem: The role of autophagy in cellular response to monomers is unclear.

Purpose: Investigation of autophagy induction by TEGDMA and BisGMA.

Methods: Analysis of autophagy markers LC3-II and p62 in exposed cells.

Results: Both monomers induced autophagy as a survival mechanism.

Conclusions: Autophagy is part of the cellular protective response to monomer stress.

Problem: Dental composites can impair DNA integrity.

Purpose: Investigation of the protective effect of NAC on DNA damage.

Methods: Exposure of gingival fibroblasts to Bis-GMA, GMA, HEMA, and TEGDMA.

Results: Significant reduction of DNA double-strand breaks by NAC treatment.

Conclusions: NAC can reduce genotoxic effects of dental composites.

Problem: BPA is a known endocrine disruptor and is released from dental composites.

Purpose: Assessment of the endocrine-disruptive potential of BPA from dental materials.

Methods: Systematic review of epidemiological and experimental studies.

Results: BPA can exert hormonally active effects even at low concentrations.

Conclusions: Reduction of BPA exposure from dental materials is desirable.

Problem: The effects of TEGDMA on bone remodeling are unclear.

Purpose: Investigation of the effects of TEGDMA on osteoclast differentiation.

Methods: RAW264.7 macrophage cultures with RANKL stimulation and TEGDMA.

Results: TEGDMA inhibited RANKL-induced osteoclastogenesis in a dose-dependent manner.

Conclusions: TEGDMA can disrupt bone remodeling by inhibiting osteoclasts.

Problem: Dental resin metabolites cause DNA damage through oxidative stress.

Purpose: Testing the protective effect of N-acetylcysteine (NAC) on DNA damage.

Methods: In vitro study with human gingival fibroblasts and NAC treatment.

Results: NAC significantly reduced DSBs foci. NAC was more effective than ascorbic acid.

Conclusions: Antioxidants can reduce DNA damage from dental resin metabolites.

Problem: The influence of dental resin monomers on stem cells is not sufficiently characterized.

Purpose: Evaluation of the effects of HEMA and TEGDMA on human mesenchymal stem cells.

Methods: Cultivation of human mesenchymal stem cells with various monomer concentrations.

Results: Both monomers reduced the proliferation rate in a concentration-dependent manner.

Conclusions: Stem cells are sensitive to dental resin monomers.

Problem: Provisional restorations release monomers that can be toxic to peri-implant tissue.

Purpose: Evaluation of the cytotoxicity of released monomers on primary cells.

Methods: In vitro exposure of primary cells to methacrylate monomers.

Results: Significant reduction in cell viability from methacrylate exposure.

Conclusions: Direct forming of provisionals can damage peri-implant tissue.

Problem: Immunological reactions to dental materials are clinically relevant.

Purpose: Review of immunological responses to dental composite components.

Methods: Systematic analysis of studies on allergy and hypersensitivity.

Results: Contact allergies to monomers are documented but rare.

Conclusions: Patch testing should be performed when allergy is suspected.

Problem: UDMA is a common component of resin cements in bone-adjacent areas.

Purpose: Investigation of the effects of UDMA on osteoblast differentiation.

Methods: Cultivation of MC3T3-E1 osteoblasts with UDMA exposure.

Results: UDMA reduced alkaline phosphatase activity and mineralization.

Conclusions: UDMA can impair bone regeneration near implants.

Problem: Dental resin monomers induce oxidative stress in cells.

Purpose: Review of cellular responses to oxidative stress from methacrylates.

Methods: Systematic review of in vitro and in vivo studies.

Results: Monomers activate cellular stress responses and apoptosis pathways.

Conclusions: Antioxidant protective mechanisms are crucial for biocompatibility.

Problem: Dental composite monomers can trigger inflammatory reactions.

Purpose: Review of inflammation and oxidative stress responses to monomers.

Methods: Systematic literature analysis on cellular stress and inflammation.

Results: Monomers activate NF-κB and proinflammatory cytokines.

Conclusions: Chronic low-grade inflammation from monomers is possible.

Problem: The genotoxic mechanism of methacrylates is not fully understood.

Purpose: Investigation of the molecular mechanisms of genotoxicity of dental methacrylates.

Methods: Analysis of DNA double-strand breaks and oxidative stress in cell cultures.

Results: Methacrylates induce DNA double-strand breaks via oxidative mechanisms.

Conclusions: Reactive oxygen species play a central role in genotoxicity.

Problem: The effects of HEMA on cellular redox balance are not fully understood.

Purpose: Investigation of HEMA-induced oxidative stress response in keratinocytes.

Methods: Analysis of GSH levels, ROS production, and antioxidant enzymes.

Results: HEMA caused significant GSH depletion and increased ROS production.

Conclusions: HEMA disrupts cellular redox homeostasis through glutathione depletion.

Problem: BisGMA is a monomer in dental composites that can be released into human cells.

Purpose: Investigation of the genotoxic effect of BisGMA on human lymphocytes and leukemia cells.

Methods: Comet assay to analyze DNA strand breaks in lymphocytes and CCRF-CEM cells.

Results: BisGMA causes DNA damage including single-strand, double-strand breaks and alkali-labile sites.

Conclusions: BisGMA is genotoxic to human lymphocytes - minimizing contact is advisable.

Problem: The short- and long-term release of components from resin-based dental materials is unclear.

Purpose: Meta-analysis to quantify monomer release from dental composites.

Methods: Systematic analysis of 71 studies, 22 of which were included in meta-analysis.

Results: HEMA, TEGDMA, BisGMA, and UDMA are frequently released.

Conclusions: Standardization guidelines for analytical research are urgently needed.

Problem: BisGMA can affect extracellular matrix production.

Purpose: Investigation of the effects of BisGMA on collagen synthesis.

Methods: Gingival fibroblast cultures with BisGMA exposure and collagen assay.

Results: BisGMA reduced type I collagen synthesis in a dose-dependent manner.

Conclusions: BisGMA can impair soft tissue healing around implants.

Problem: The mechanisms of TEGDMA-induced cell death are not fully elucidated.

Purpose: Investigation of the role of mitochondria in TEGDMA-induced apoptosis.

Methods: Analysis of mitochondrial membrane potential, caspase activation, and cytochrome c release.

Results: TEGDMA induced mitochondrial dysfunction, caspase-9 and caspase-3 activation.

Conclusions: TEGDMA induces apoptosis via the intrinsic mitochondrial pathway.

Problem: Long-term monomer release from modern composites was insufficiently studied.

Purpose: Investigation of monomer release over a period of several months.

Methods: HPLC analysis of monomer elution from 5 modern composites over 180 days.

Results: Monomer release continues for over 6 months, with highest values in the first 7 days.

Conclusions: Modern composites continuously release monomers - chronic exposure is unavoidable.

Problem: Dental resin monomers can have cytotoxic effects on cells.

Purpose: Comprehensive overview of cellular responses to dental resin components.

Methods: Systematic review of in vitro studies on cytotoxicity and genotoxicity.

Results: Monomers induce oxidative stress and DNA damage depending on concentration.

Conclusions: Cell type and exposure time influence the response to dental resin components.

Problem: The cytotoxicity of different monomers on various cell types has not been comparatively studied.

Purpose: Comparative evaluation of the cytotoxicity of resin monomers on two cell lines.

Methods: MTT assay with human gingival fibroblasts and HaCaT keratinocytes.

Results: BisGMA and UDMA were most toxic. HEMA showed the lowest toxicity.

Conclusions: The toxicity order is: BisGMA > UDMA > TEGDMA > HEMA.

Problem: The effects of resin monomers on vital pulp cells are clinically relevant.

Purpose: Investigation of the toxicity of TEGDMA and HEMA on pulp fibroblasts.

Methods: In vitro culture of human pulp fibroblasts with monomer exposure.

Results: Both monomers showed dose-dependent cytotoxic effects. TEGDMA was more toxic than HEMA.

Conclusions: TEGDMA and HEMA can affect the vitality of pulp cells.

Problem: The specific release of individual monomers from composites was not quantified.

Purpose: Quantitative HPLC analysis of the four main monomers in dental resins.

Methods: HPLC analysis of Bis-GMA, TEGDMA, UDMA and Bis-EMA release over 30 days.

Results: TEGDMA is released fastest, Bis-GMA accumulates over longer periods.

Conclusions: Each monomer has a specific release profile with different toxicological implications.

Problem: The extent of monomer release from dental composites was largely unknown.

Purpose: Pioneer work on systematic investigation of monomer elution from composites.

Methods: Extraction and chromatographic analysis of released substances from various composites.

Results: Significant amounts of monomers and additives are released over weeks.

Conclusions: Foundational study that first systematically documented the problem of residual monomer release.

Problem: The soft tissue seal around implants is crucial for long-term stability.

Purpose: Systematic analysis of gingival fibroblast attachment to various titanium nanostructures.

Methods: Literature review on TiO2 nanotubes compared to pure titanium and titanium alloys.

Results: Nanostructured surfaces improve fibroblast attachment and reduce bacterial colonization.

Conclusions: Surface modification at the nano level can optimize the biological seal at the implant.

Problem: Soft tissue integration on different titanium surfaces is critical for long-term implant success.

Purpose: Systematic comparison of fibroblast attachment to TiO₂ nanotubes vs. pure titanium.

Methods: Systematic review following PRISMA guidelines with analysis of in vitro studies.

Results: TiO₂ nanotubes show significantly improved fibroblast attachment and proliferation.

Conclusions: Surface-modified titanium (e.g., through anodization) improves biological integration.

Problem: The optimal anodization voltage for maximum cell attachment is not established.

Purpose: Comparison of anodized titanium surfaces at different voltages with SLA surfaces.

Methods: In vitro cultivation of osteoblasts and fibroblasts on differently treated titanium samples.

Results: Anodized surfaces show significantly higher cell attachment and collagen synthesis than SLA.

Conclusions: Anodization at optimal voltage creates bioactive surfaces with improved cell integration compared to conventional surface treatments.

Problem: Titanium abutments can compromise esthetics in thin gingival biotypes.

Purpose: Investigation of anodized titanium abutments with warmer color tones for improved esthetics.

Methods: Clinical study with spectrophotometry and patient satisfaction evaluation.

Results: Anodized abutments (pink/gold) harmonize better with surrounding tissue.

Conclusions: Anodization improves both biocompatibility and esthetics through warmer color tones in thin biotypes.

Problem: The surface texture of abutments influences cell attachment - optimal surfaces are unclear.

Purpose: Comparison of smooth, acid-etched and anodized titanium surfaces for abutments.

Methods: Scanning electron microscopy and cell cultures with fibroblasts and osteoblasts on various surfaces.

Results: Anodized surfaces showed better cell attachment and proliferation than smooth surfaces.

Conclusions: The surface treatment of the abutment significantly influences soft tissue integration.

Problem: The surface characteristics of abutments influence the biological tissue response.

Purpose: Investigation of cell behavior on various clinically used titanium surfaces.

Methods: Comparison of machined, sandblasted, and anodized surfaces.

Results: Anodized and modified surfaces show best cell attachment and gene expression.

Conclusions: Surface modification through anodization is clinically advantageous for soft tissue integration.

Problem: PEEK is promoted as an alternative to titanium abutments, but biocompatibility is poorly studied.

Purpose: Comparative analysis of cell response to PEEK and titanium.

Methods: Fibroblast and osteoblast cultures on PEEK and titanium surfaces.

Results: Titanium showed significantly better cell attachment and proliferation than PEEK.

Conclusions: PEEK is biologically inferior to titanium for soft tissue attachment.

Problem: Repeated abutment changes can cause bone resorption.

Purpose: Meta-analysis comparing one-abutment-one-time vs. multiple abutment changes.

Methods: Systematic review of 12 RCTs with 1,855 implants.

Results: One-abutment-one-time: 0.19 mm less marginal bone loss (p<0.001).

Conclusions: Definitive abutment at insertion leads to significantly better bone preservation.

Problem: Soft tissue integration of different abutment materials is clinically relevant.

Purpose: Clinical comparison of soft tissue response to titanium and zirconia abutments.

Methods: Prospective split-mouth study with histomorphometric analysis.

Results: Both materials showed comparable biological width and attachment levels.

Conclusions: Titanium and zirconia are both suitable for soft tissue integration.

Problem: The differentiation of mesenchymal stem cells on titanium is not fully characterized.

Purpose: Investigation of osteogenic differentiation of MSCs on structured titanium surfaces.

Methods: Human MSCs on SLA and modified SLA surfaces.

Results: Structured surfaces induced osteogenic differentiation without external factors.

Conclusions: Surface topography directly controls stem cell differentiation.

Problem: The role of titanium surface hydrophilicity for early cellular response is not understood.

Purpose: Comparison of osteogenic response to hydrophilic vs. hydrophobic titanium surfaces.

Methods: Osteoblast cultures on SLA and modified SLActive surfaces. Gene expression analysis.

Results: Hydrophilic surfaces showed significantly increased osteogenic gene expression at 24h.

Conclusions: Surface chemistry significantly influences early cellular response.

Problem: Anodization of titanium creates a porous oxide layer whose biological effect on cell behavior needs to be investigated.

Purpose: Characterization of surface properties and bioactivity of anodized titanium surfaces.

Methods: Anodization of titanium samples at various voltages. Scanning electron microscopy, contact angle measurement, osteoblast cultures and alkaline phosphatase activity.

Results: Anodized surfaces showed significantly improved hydrophilicity and nanoporous structure. Osteoblast proliferation and ALP activity were significantly increased on anodized surfaces. Apatite formation demonstrated after 14 days.

Conclusions: Anodization significantly improves titanium surface properties and promotes cellular response and bone formation. Anodized titanium surfaces are more bioactive than machined surfaces.

Problem: The optimal roughness level for fibroblast attachment is unclear.

Purpose: Investigation of the influence of surface roughness on fibroblast response.

Methods: Comparison of titanium surfaces with different Ra values.

Results: Moderate roughness (Ra 0.5-2 μm) showed optimal fibroblast attachment.

Conclusions: Surface topography significantly influences soft tissue attachment.

Problem: The temporal sequence of early osseointegration is not fully documented.

Purpose: Review of histological phases of early osseointegration.

Methods: Systematic analysis of animal and human studies.

Results: Week 1-2: fibrin matrix, Week 2-4: woven bone, from Week 6: lamellar bone.

Conclusions: Structured titanium surfaces accelerate these phases.

Problem: The molecular mechanisms of early osseointegration are insufficiently characterized.

Purpose: Gene expression analysis during early osseointegration in humans.

Methods: RNA extraction and microarray analysis of peri-implant tissues.

Results: Significant upregulation of osteogenic genes in the first week.

Conclusions: Structured titanium surfaces activate osteogenic signaling pathways.

Problem: Initial protein adsorption determines subsequent cell response.

Purpose: Comparison of protein adsorption on titanium and zirconia.

Methods: XPS and protein assays on both materials.

Results: Titanium showed higher fibronectin adsorption than zirconia.

Conclusions: Material chemistry influences protein conformation and cell attachment.

Problem: Bacterial colonization can impair soft tissue integration.

Purpose: Comparison of bacterial adhesion on different abutment materials.

Methods: Biofilm cultures on titanium, zirconia, and PEEK.

Results: Titanium and zirconia showed similar, low bacterial adhesion.

Conclusions: Material choice influences bacterial colonization and soft tissue health.

Problem: Tissue integration of titanium implants depends on surface properties.

Purpose: Evaluation of the impact of hydrophilic surface modifications on tissue integration.

Methods: Systematic literature review on hydroxylated/hydrated titanium surfaces.

Results: Hydrophilic surfaces showed significant influence on cell differentiation and growth factor production. Clinical studies confirm improved tissue integration.

Conclusions: Hydrophilic surface modifications have demonstrated potential to improve tissue integration of titanium implants.

Problem: Fibrin retention is important for the early phase of osseointegration.

Purpose: Comparison of fibrin retention on different titanium surfaces.

Methods: In vitro blood coagulation tests on SLA, TPS, and machined surfaces.

Results: SLA surfaces showed the best fibrin retention.

Conclusions: Surface microtopography influences early wound healing.

Problem: The ultrastructure of the peri-implant soft tissue barrier is poorly documented.

Purpose: Electron microscopic characterization of the implant-tissue interface.

Methods: TEM analysis of peri-implant biopsies.

Results: Hemidesmosomes and basal lamina-like structures demonstrated on titanium.

Conclusions: Titanium enables a functional epithelial seal.

Problem: Early mucosal healing influences long-term implant success.

Purpose: Documentation of mucosal healing phases around titanium abutments.

Methods: Clinical and histological analysis in 24 patients.

Results: Complete mucosal maturation after 6-8 weeks around titanium abutments.

Conclusions: Titanium enables predictable mucosal healing.

Problem: Mechanical forces influence bone cell differentiation.

Purpose: Review of mechanotransductive signaling pathways in osteoblasts.

Methods: Systematic analysis of literature on mechanotransduction.

Results: Implanted materials with optimal surface topography improve mechanosensory cell response.

Conclusions: Surface design should consider mechanotransductive aspects.

Problem: Long-term soft tissue stability around implants is crucial for treatment success.

Purpose: 15-year follow-up of soft tissue conditions around titanium implants.

Methods: Clinical and radiographic follow-up of 461 implants.

Results: 92% stable soft tissue conditions after 15 years.

Conclusions: Titanium enables long-term stable peri-implant soft tissues.

Problem: Keratinocyte attachment to abutment materials is crucial for epithelial sealing.

Purpose: Comparison of keratinocyte response to different abutment surfaces.

Methods: Cell culture studies with titanium, zirconia, and PEEK.

Results: Titanium and zirconia showed similar keratinocyte attachment, PEEK was significantly worse.

Conclusions: Metallic and ceramic abutments are superior to polymeric materials.

Problem: Nanotopography can influence cell-material interaction.

Purpose: Investigation of cell response to nanostructured titanium surfaces.

Methods: Comparison of conventional and nanostructured titanium samples.

Results: Nanostructured surfaces showed 50% more cell attachment.

Conclusions: Nanotechnology offers new possibilities for surface optimization.

Problem: Anodization changes surface chemistry and topography.

Purpose: Investigation of cell response to anodized vs. non-anodized surfaces.

Methods: Osteoblast cultures on various anodized titanium samples.

Results: Anodized surfaces showed 30% higher cell attachment.

Conclusions: Anodization improves the biocompatibility of titanium.

Problem: The influence of different surface treatments on fibroblasts is not fully characterized.

Purpose: Investigation of fibroblast response to different titanium surfaces.

Methods: Cell culture studies on SLA, machined, and polished surfaces.

Results: SLA surfaces showed improved fibroblast attachment compared to smooth surfaces.

Conclusions: Surface topography positively influences soft tissue response.

Problem: The role of surface energy in cell adhesion is not fully understood.

Purpose: Correlation of surface energy with cell adhesion parameters.

Methods: Contact angle measurements and cell culture studies on various metals.

Results: Higher surface energy correlated with better cell adhesion.

Conclusions: Surface energy is an important parameter for biocompatibility.

Problem: The role of growth factors in surface response is poorly understood.

Purpose: Analysis of TGF-β1 production by osteoblasts on different titanium surfaces.

Methods: ELISA measurements of TGF-β1 in cell culture supernatants.

Results: Rough surfaces induced higher TGF-β1 production.

Conclusions: Surface roughness modulates paracrine signaling.

Problem: The long-term stability of soft tissue attachment around titanium abutments is poorly documented.

Purpose: Long-term investigation of peri-implant soft tissue stability.

Methods: 5-year follow-up of 102 implants with clinical and radiographic measurements.

Results: Stable soft tissue conditions over 5 years with titanium abutments.

Conclusions: Titanium provides long-term stable soft tissue integration.

Problem: Surface roughness influences osteoblast differentiation.

Purpose: Investigation of the influence of surface morphology on cell differentiation.

Methods: MG63 osteoblasts on titanium with different roughness levels.

Results: Higher roughness significantly improved osteoblast differentiation.

Conclusions: Surface topography specifically modulates cell response.

Problem: The quality of epithelial attachment varies depending on abutment material.

Purpose: Histological examination of epithelial sealing.

Methods: Biopsies of peri-implant tissue in 35 patients.

Results: Titanium showed the best epithelial sealing compared to other materials.

Conclusions: Titanium is the preferred material for epithelial integration.

Problem: Different surface treatments of titanium influence fibroblast response.

Purpose: Comparison of fibroblast response to polished, sandblasted, and etched titanium surfaces.

Methods: Cell cultures with analysis of attachment, proliferation, and morphology.

Results: Moderate roughness improved fibroblast attachment compared to polished surfaces.

Conclusions: Surface topography is a critical factor for soft tissue integration.

Problem: Collagen formation on titanium is crucial for soft tissue integration.

Purpose: Analysis of collagen synthesis on different titanium surfaces.

Methods: Fibroblast cultures with collagen assays.

Results: Titanium surfaces promoted collagen type I synthesis.

Conclusions: Titanium supports natural soft tissue matrix formation.

Problem: The role of integrins in cell-titanium interaction is insufficiently characterized.

Purpose: Investigation of integrin expression during cell-titanium contact.

Methods: Immunofluorescence analysis of osteoblasts on titanium surfaces.

Results: Increased α5β1 integrin expression on structured titanium surfaces.

Conclusions: Titanium surface topography influences integrin-mediated cell adhesion.

Problem: The formation of biological width around implant abutments is not fully understood.

Purpose: Histological characterization of peri-implant soft tissue structure.

Methods: Animal study in dogs with histomorphometric analysis.

Results: Biological width of approximately 3-4 mm established around titanium abutments.

Conclusions: Titanium enables the formation of a stable biological barrier.

Problem: The gingival response to different abutment materials is clinically relevant.

Purpose: Histological analysis of gingival attachment to titanium abutments.

Methods: Biopsies of peri-implant gingiva in 12 patients.

Results: Hemidesmosome-like structures at the titanium-epithelium interface.

Conclusions: Titanium enables true epithelial attachment.

Problem: Epithelial attachment to different materials has not been comparatively studied.

Purpose: Investigation of hemidesmosome formation on titanium, ceramic, and polymers.

Methods: Electron microscopic analysis of cell-material interaction.

Results: Titanium showed the best hemidesmosome formation, followed by ceramic.

Conclusions: Material choice significantly influences epithelial sealing.

Problem: Cement residues under the gum are often not detected and can cause peri-implantitis.

Purpose: Endoscopic examination of cement residues in patients with peri-implant problems.

Methods: Peri-implant endoscopy in 87 patients with cemented implant crowns.

Results: Cement residues were found in 68% of implants with peri-implantitis - often not clinically visible.

Conclusions: Cement residues are a common risk factor - cement-free solutions significantly reduce the risk.

Problem: The prevalence of cement remnants in peri-implant diseases is unclear.

Purpose: Cross-sectional study on the correlation of cement excess and peri-implantitis.

Methods: Clinical and radiographic examination of patients with cement-retained crowns.

Results: Significantly higher peri-implantitis rates with detectable cement excess.

Conclusions: Cement excess is a significant risk factor for peri-implant diseases. Minimization of subgingival cement exposure is clinically indicated.

Problem: Cement excess remains a leading cause of peri-implantitis.

Purpose: Evaluation of digital workflows for optimal abutment design.

Methods: Comparison of 180 digitally vs. conventionally planned restorations.

Results: Digital planning reduced cement excess by 85%.

Conclusions: CAD/CAM-based custom abutments effectively minimize cement risks.

Problem: Cement-induced peri-implantitis accounts for 1.9–75% of implant failures.

Purpose: Analysis of the biological effects of various dental cements on osseointegrated implants in an animal model.

Methods: Micro-CT and histopathological examination in Lewis rats with various cements.

Results: All tested cements caused inflammatory reactions - severity varied by cement type.

Conclusions: Excess cement triggers inflammation and bone loss - cement-free abutments eliminate this risk.

Problem: Cement-mediated peri-implantitis accounts for 1.9-75% of implant failures.

Purpose: Histopathological investigation of cement effects on osseointegrated implants.

Methods: Animal model with micro-CT and histology after cement exposure.

Results: Cement causes progressive bone resorption and inflammation - irreversible damage after 8 weeks.

Conclusions: Cement residues cause progressive bone resorption. Maximum distance of the adhesive interface from bone reduces risk.

Problem: The optimal technique for minimizing cement residues is not established.

Purpose: Comparison of different crown seating methods regarding cement residues.

Methods: In vitro analysis with different seating techniques and micro-CT evaluation.

Results: No technique completely eliminates cement residues - cement particularly remains subgingivally.

Conclusions: Cement-retained crowns carry inherent risks from unavoidable subgingival cement residues. Alternative retention strategies should be considered.

Problem: Standard abutments often lead to suboptimal cement control.

Purpose: Review of the benefits of customized abutments for cement control.

Methods: Narrative review of 42 studies on abutment design and cement control.

Results: Customized abutments with supragingival margins significantly reduced cement problems.

Conclusions: Patient-specific abutments are key to minimizing cement risks.

Problem: The position of cement relative to bone may be critical.

Purpose: Investigation of the relationship between cement position and bone loss.

Methods: CBCT analysis of 87 implants with cement-retained crowns.

Results: More apical cement position correlated with greater bone loss.

Conclusions: Maximum distance between cement interface and bone is protective.

Problem: The influence of retention method on peri-implant health is controversial.

Purpose: Systematic review comparing peri-implant health.

Methods: Meta-analysis of 23 studies focusing on mucositis and peri-implantitis.

Results: Higher prevalence of peri-implantitis with cemented restorations.

Conclusions: Screw-retained restorations show better peri-implant health.

Problem: The histopathological effects of cement residue on bone are poorly documented.

Purpose: Histological analysis of bone tissue after cement exposure.

Methods: Biopsies of peri-implant bone during explantations.

Results: Necrotic zones demonstrated in contact areas with cement residue.

Conclusions: Cement residue can cause direct bone necrosis.

Problem: Luting cements can come into contact with bone tissue.

Purpose: Comparison of cytotoxicity of different luting cements on osteoblasts.

Methods: MTT assay with MG-63 osteoblasts and various cement types.

Results: Resin-modified cements showed higher toxicity than zinc phosphate.

Conclusions: Resin cements can impair bone regeneration near the cement interface.

Problem: Abutment shape influences cement extrusion and residue.

Purpose: Comparison of different abutment designs regarding cement control.

Methods: In vitro study with standard and modified abutment shapes.

Results: Straight emergence profiles showed less cement residue than concave.

Conclusions: Custom abutments with straight profiles improve cement control.

Problem: Different cement types have different biological properties.

Purpose: Comparison of methacrylate cement and zinc oxide-eugenol on bone loss.

Methods: Clinical study with radiographic measurement of bone loss.

Results: Methacrylate: 1.37 mm bone loss. Zinc oxide-eugenol: only 0.07 mm – 20-fold difference.

Conclusions: Methacrylate-based cements are associated with higher bone loss.

Problem: Subgingival abutment margins are aesthetically advantageous, but cement removal is difficult.

Purpose: Quantification of the influence of abutment margin level on residual cement.

Methods: In vitro study with supragingival, 1mm, and 3mm subgingival margins.

Results: Subgingival margins showed significantly more excess cement.

Conclusions: Supragingival margins allow the best cement control.

Problem: The clinical differences between cement- and screw-retained restorations are unclear.

Purpose: Systematic comparison of long-term outcomes of both retention methods.

Methods: Meta-analysis of 15 randomized controlled trials.

Results: Cement-retained: higher rate of biological complications. Screw-retained: higher technical complications.

Conclusions: Retention method should be chosen based on clinical requirements.

Problem: Residual cement in implant-supported restorations can lead to peri-implantitis.

Purpose: Investigation of residual cement prevalence in peri-implantitis cases.

Methods: Retrospective analysis of 39 implants with peri-implantitis.

Results: 80.4% of peri-implantitis cases showed cement residue. After removal: 74% resolution.

Conclusions: Residual cement is a significant risk factor for peri-implantitis.

Problem: The prevalence of titanium allergies in implant patients is unknown.

Purpose: Investigation of the frequency of titanium hypersensitivity in implant patients.

Methods: Epicutaneous tests in 1500 implant patients with suspected metal allergy.

Results: 0.6% of patients showed positive reactions to titanium in patch testing.

Conclusions: Titanium allergies are rare but exist and can lead to implant failure.

Problem: Resin cement residue can trigger local mucosal reactions.

Purpose: Investigation of local inflammatory reactions to resin cement residue.

Methods: Biopsies of peri-implant mucosa in 30 patients.

Results: Increased mast cell and lymphocyte infiltration in patients with cement residue.

Conclusions: Resin cement contact can trigger local allergic reactions.

Problem: There is a lack of standardized test series for dental allergens.

Purpose: Development of a standardized patch test series for dental allergens.

Methods: Literature analysis and expert consensus.

Results: Recommendation of a 12-allergen standard series including HEMA, BisGMA, and TEGDMA.

Conclusions: Standardized tests enable better diagnosis of dental allergies.

Problem: Allergic patients need alternative restorative materials.

Purpose: Overview of allergen-free alternatives in restorative dentistry.

Methods: Systematic review of available material options.

Results: Titanium, zirconia, and glass-ceramic materials are safe for most allergy patients.

Conclusions: Metal-free and resin-free options enable safe treatment for allergies.

Problem: Acrylate allergies can cause peri-implant complications.

Purpose: Investigation of the relationship between acrylate allergy and implant complications.

Methods: Retrospective analysis of 50 patients with unexplained implant failure.

Results: 18% of patients with implant failure showed acrylate sensitization.

Conclusions: Allergy testing should be considered in unexplained peri-implant complications.

Problem: BisGMA is a known contact allergen in dentistry.

Purpose: Investigation of BisGMA sensitization in dental professionals.

Methods: Patch tests in 220 dental professionals with skin symptoms.

Results: 8.6% showed positive reactions to BisGMA.

Conclusions: BisGMA allergy is a relevant occupational risk for dental professionals.

Problem: The relative sensitization potential of different monomers is unclear.

Purpose: Comparison of sensitization potential of HEMA, TEGDMA, UDMA, and BisGMA.

Methods: Lymphocyte proliferation assays and hapten-protein binding studies.

Results: HEMA showed the highest sensitization potential, followed by TEGDMA.

Conclusions: HEMA-free formulations could reduce allergy risk.

Problem: Dental professionals have an increased risk for contact allergies.

Purpose: Review of occupational contact allergies in dentistry.

Methods: Analysis of occupational disease registries in 5 European countries.

Results: Methacrylates were the most common allergens, followed by latex.

Conclusions: Prevention measures and protective equipment are essential in dentistry.

Problem: Titanium is considered biocompatible, but immunological reactions are possible.

Purpose: Review of immunological aspects of titanium implants.

Methods: Systematic analysis of literature on titanium immune reactions.

Results: Titanium corrosion products can activate T lymphocytes.

Conclusions: Although rare, titanium allergies should be considered in implant failure.

Problem: Methacrylates can cross-react with each other.

Purpose: Analysis of cross-reactivity patterns in methacrylate allergies.

Methods: Patch tests with a range of methacrylates in 150 sensitized patients.

Results: 70% of HEMA allergy patients also reacted to BisGMA or TEGDMA.

Conclusions: Cross-reactivity requires comprehensive allergy testing before dental treatments.

Problem: HEMA is a common allergen in dental materials.

Purpose: Investigation of the prevalence of HEMA contact allergies in dental personnel.

Methods: Patch tests in 445 dental professionals with suspected occupational contact dermatitis.

Results: 15% showed positive reactions to HEMA.

Conclusions: HEMA contact allergy is a significant occupational risk in dentistry.

Problem: Provisional acrylic restorations can trigger allergic reactions.

Purpose: Documentation of allergic reactions to provisionals.

Methods: Case series with 25 patients with mucosal symptoms after provisional restoration.

Results: 80% of patients showed positive reactions to methacrylate monomers.

Conclusions: Resin-based provisionals should be avoided in allergy patients.