European Journal of Prosthodontics and Restorative Dentistry最新文献

Introduction: A clinician must choose the right treatment modality with various fixed and removable prosthetic treatments available for completely edentulous patients. This systematic review aims to evaluate removable and fixed prosthetic treatment modalities in a completely edentulous patient.

Material and methods: A comprehensive search of MEDLINE, PubMed, Scopus, Web of Science, Google Scholar, and LILACS and a manual search across reference lists of included studies were done. The study analyzed clinical and radiological outcome for patients with completely edentulous arches, including bone loss, post-prosthetic rehabilitation challenges and hygiene maintenance across removable and permanent treatment options.

Results: A total of 2182 articles, which, after the thorough screening process yielded 10 studies for qualitative analysis. The success rates of implant-supported fixed prostheses (IFP) were greater than those of implantsupported overdentures (IOD) and complete dentures (CD), respectively. Nevertheless, there were significant differences in the success criteria across the various treatment options, making it futile to compare the success rates directly.

Conclusions: Comparing the fixed and removable treatment modalities for completely edentulous patients regarding successful outcomes is multifaceted and challenging due to the lack of comparable assessments with equivalent follow-up periods and similar outcome criteria.

Objectives: This pilot randomised controlled trial assessed the acceptability of 3D printed complete dentures versus conventionally manufactured dentures. It aimed to identify the sample size needed for a full-scale trial and refine digital fabrication and trial protocols.

Methods: A multi-centre, double-blinded, cross-over design was used with 17 participants (14 completed), all aged 60+ and complete denture wearers. Each participant received 3D printed and conventional dentures, worn for eight weeks each. Tooth positioning and denture shape were standardised. The OHIP-EDENT questionnaire measured comfort, retention, stability, and chewing efficiency.

Results: A sample size of 35 is recommended for a definitive trial. Participants preferred conventional dentures. Issues with 3D printed dentures included unreliable tooth placement and structural failures. Seven breakages (one denture broke four times) and six tooth debondings occured in the 3D printed group.

Conclusions: A sample size of 35 participants is recommended for a definitive trial, post adjustment. 3D printing offers potential benefits, but this study found lower patient satisfaction and material challenges in the 3D printed dentures. Technical and protocol refinements are needed before 3D printed dentures can be recommended for routine use.

Clinical relevance: Until fabrication issues are resolved, conventional dentures remain the more reliable option in prosthodontic care.

Purpose: To analyze the survival rates and influential factors of in situ root posts from 2007 to 2017, identifying key parameters affecting their longevity.

Methods: The study included all restorations treated at the Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe-University, from 2007 to 2017, involving 1120 fibre-reinforced root posts with an 8.0% dropout rate and a significance level of alpha ⟨5%.

Results: Patients had a mean age of 61.1±14.37 years. The study found a survival rate of 60.71±14.70 years versus a loss at 64.58±10.45 years (p⟨0.05). The periodontal condition was the most significant factor affecting survival. Cytec Blanco and DT light post showed similar ten-year survival rates of 79.17% and 79.34%, respectively, without significant differences. Periodontal health was the most critical factor for root post loss.

Conclusion: Root post loss is more influenced by patient's periodontal health and the indication for root canal treatment than by the structural characteristics of the fibre posts.

Clinical relevance: This retrospective cohort study addresses the lack of longterm (⟩10 years) clinical research on fibre-reinforced root posts, focusing on various factors influencing their success or failure.

Objectives: Conflicting evidence exists regarding the optimal impression thickness and the influence of tray spacing on the accuracy of elastomeric impressions and resulting casts. This study evaluated the effect of three tray spacings (2 mm, 4 mm, and 6 mm) on the dimensional accuracy of three addition silicone impression materials (Aquasil, Panasil, and Elite-HD).

Methods: Forty-five impressions of a partially dentate maxillary resin cast were made using standardized custom trays with designated spacer thicknesses. Impressions were scanned using a desktop scanner, and casts were poured into type IV dental stone and subsequently scanned. A digital reference cast was generated and used to superimpose all test scans. Deviations were measured across the full arch, palate, and dentulous-edentulous (horseshoe) regions using digital metrology software. Data were analyzed using multiple regression and Tukey HSD post-hoc tests (α = 0.05).

Results: Spacer thickness and material significantly influenced impression and cast accuracy, with higher deviations observed in the horseshoe region compared to the palate (p ⟨ 0.001).

Conclusions: Panasil at 6-mm spacing produced the most accurate impressions across all regions.

Clinical relevance: For cast accuracy, Elite-HD at 4-mm spacing showed the lowest deviation in the palate, while Panasil at 2-mm spacing demonstrated superior accuracy in both full arch and horseshoe regions.

Objective: This study aimed to assess the hydrolytic stability of the adhesive interface between repaired bulk-fill and bulk-fill resin composites after 12 months of water storage.

Materials and methods: Bulk-fill resin composite specimens were bonded to smooth substrate surfaces using three different primer/bonding systems. A total of 35 specimens were prepared for shear bond strength (SBS) testing, and 30 specimens for micro-tensile bond strength (μTBS) testing. The specimens were aged in water at 37°C for 12 months, after which SBS and μTBS were evaluated.

Results: The mean SBS ranged from 6.0 to 14.9 MPa, with the highest values observed for the Ceramic primer. The mean μTBS ranged from 0 to 7.8 MPa, with the Composite primer yielding the highest values. Both primers outperformed the three-step etch-and-rinse adhesive in terms of bond strength.

Conclusions: The Ceramic primer (containing silane) and the Composite primer exhibited superior adhesive performance compared to the three-step etch-and-rinse adhesive, demonstrating better long-term bond stability.

Clinical relevance: The findings suggest that using Ceramic or Composite primers can enhance the durability of repaired bulk-fill composite restorations, improving adhesive stability and long-term clinical outcomes.

Objectives: Implant-supported mandibular dentures are increasingly preferred for edentulous mandibles due to their superior function, stability, and patient satisfaction. However, when opposed by a conventional maxillary complete denture (CD), it remains unclear whether this configuration contributes to Combination Syndrome. This systematic review investigates the presence and clinical features of Combination Syndrome in such cases.

Methods: A systematic search of Scopus, Ovid Medline, Web of Science, and Embase was conducted for studies published between 1994 and 2024. Of 133 initially identified articles, six met the inclusion criteria. These included four cohort studies, one cross-sectional study, and one randomised controlled trial, involving 141 participants.

Results: Common findings included anterior maxillary bone loss, loss of posterior occlusion, and reduced retention of the maxillary denture-often linked to excessive anterior contact. Some studies reported increased ridge resorption with implant-supported overdentures, while others found no significant differences compared to conventional dentures.

Conclusion: Due to the limited number and quality of available studies, no definitive conclusion can be drawn regarding the prevalence of Combination Syndrome in this prosthetic arrangement. Further well-designed clinical studies are needed to clarify its long-term implications.

Introduction: Thin all-ceramic restorations enhance esthetics but are less predictable, especially with dark substrates, where opaque resin luting agents may be needed, though not always available. This study aimed to evaluate the influence of a resin luting agent on the final color of lithium disilicate crowns and masking of two prosthetic substrates (esthetic and metallic).

Methods: Eighty prostheses with ceramic crowns were simulated from bovine roots. The specimens were randomized, according to the intraradicular retainer used, and divided into 2 groups (n=40): metallic (cast post and core) and esthetic (glass fiber post with composite resin core). The crowns were attached to their cores and the first CIELAB scale was measured with a spectrophotometer. The second color measurement was performed after cementation with a dual resin luting agent. The results were submitted to color variation calculation and statistical analysis.

Results: Coordinate * L and * b values increased significantly (p⟨0.05) after cementation for both groups and there was no statistical difference between the groups for the ΔE00 value (p=0.242).

Conclusions: Resin luting agent positively impacted the final crown color and aided in masking both substrates. The effect of the substrate was attenuated on the final color of ceramic crowns.

Objectives: This study evaluated the microshear bond strength between resin cement and three translucent zirconias (3Y-PSZ, 4Y-PSZ, and 5Y-PSZ) following air abrasion with aluminum oxide (Al2O3) or tribochemical silica coating (CoJet), before and after thermal cycling. 3Y-TZP was included as a control.

Methods: Zirconia specimens were treated with air abrasion or CoJet, followed by the application of a zirconia primer and adhesive. Dual-cured resin cement cylinders were then bonded to the treated surfaces for microshear bond strength testing after 7 days in distilled water or after aging (30 days and 10,000 thermal cycles). Data were analyzed using three-way ANOVA (zirconia, treatment, and aging) and Tukey's test (α = 0.05).

Results: The triple interaction was not significant. Treatment*time and zirconia*time interactions were significant (p⟨0.001). 3YTZP exhibited higher bond strength at 7 days. Higher bond strength values were obtained for CoJet and Al2O3 air abrasion groups at 7 days (13.47 ± 3.55 MPa). All specimens presented adhesive failures.

Conclusion: The type of zirconia significantly influenced the microshear bond strength. 3Y-TZP showed greater bond strength compared to translucent zirconias. Tribochemical coating promoted higher bond strength at both time points. Thermal cycling negatively affected the bond strength of all zirconias evaluated.

Clinical relevance: The observed variations in bond strength among different translucent zirconias emphasize the importance of material selection for optimal clinical outcomes. Additionally, the positive influence of tribochemical silica coating on bond strength highlights its potential as a valuable surface treatment for enhancing the durability of zirconia-based restorations in the oral environment. However, the detrimental effects of thermal cycling on bond strength emphasize the need for careful clinical considerations when fabricating and cementing translucent zirconia restorations.

Introduction: This study investigated the effects of tempering on color stability of glassinfiltrated monochrome (Mo) and multilayer (Mu) 5 mol% yttria-partially stabilized zirconia (5Y-PSZ).

Materials and methods: 180 5Y-PSZ specimens (width-length-thickness = 10-20-2 mm) were prepared from Mo and Mu, comprising cervical (C) and incisal (I) zone, and sintered with traditional versus glass infiltrated technique with different tempering processes through slow (S: 5°C/min), normal (N: 35°C/min), and fast (F: 70°C/min) cooling. CIE-L*a*b*, color difference (ΔEdiff), and microstructures were evaluated. ANOVA and Tamhane's comparisons were determined for significant differences (p⟨0.05).

Results: Mo closely resembled MuI for L* and a*, but was similar to MuC for b* and ΔEdiff. MuC exhibited significantly higher L*, a*, and b*, but lower ΔEdiff than MuI. Glass infiltration and fast tempering significantly increased L*, and ΔEdiff, whereas decreased a*, and b*. Mu had higher color change than Mo, but both were within an acceptable threshold (ΔEdiff≤5.5).

Conclusions: Glass infiltration and tempering processes altered color, with greater influence on Mu>Mo. Glass infiltration and rapid tempering produced a whitechalky and less chroma due to smaller grain size and t→m transformation. Nevertheless, color alterations were still within acceptable limits, thus considered color stable.

Introduction: The objective of this study was to determine the penetration ability of elastomeric impression materials affected by abutment finish line configurations with a simulated gingival sulcus model.

Methods: The gingival sulcus model was simulated using agarose gel and milled abutment models. Twenty impressions of each finish line (feather-edge, mini-chamfer, chamfer, heavy chamfer, and radial shoulder) were made. Four elastomeric impression materials were used for the two-step double-mixed, double-impression technique, consisting of polysulfide, polyvinylsiloxane, polyether, and vinylsiloxanether (N=120). The extension of impression that flowed into the simulated gingival crevices was measured under a stereomicroscope by using image analysis software.

Results: Two-way analysis of variance revealed statistically significant main effects and an interaction between finish line type and impression material type (p⟨0.05). The radial shoulder showed significantly greater penetration than the other finish lines for polyvinylsiloxane, polyether, and vinylsiloxanether (p⟨0.05).

Conclusions: The type of finish line influences the ability of elastomeric impression materials to penetrate within a simulated gingival sulcus model. The penetration ability of elastomers tends to increase due to the increasing width of the finish line. Among all the materials, polyether has the greatest potential to penetrate through the narrow gingival sulcus.