European Journal of Prosthodontics and Restorative Dentistry最新文献

Aim: To compare the tensile strength, dislodgement forces, marginal gap and failure types between digitally fabricated zirconia root copings and conventionally manufactured cast gold root copings.

Methods: Extracted human teeth (N=30) were prepared for the root copings and randomly divided into 2 groups: (1)zirconia root copings(ZC) and gold root copings(GC). The specimens were tested for tensile bond strength and dislodgement forces in a universal testing machine and the types of the coping failures modes were analyzed. In addition, the marginal gap was measured. Data were analyzed using one-way ANOVA and Pearson correlation test.

Results: Mean tensile bond strength in the total horizontal adhesive area for ZC group was 7.5±2.8MPa and for GC group 10.5±4.8 MPa(p⟩0.05). The mean dislodgement forces for the ZC and GC groups were 242±107N and 311±118N, respectively and with no significant differences between the groups (p=0.12). The mean vertical marginal gap in the ZC group amounted to 27±11.05μm, while in the GC group it was 35.33±10.49μm, showing no statistically significant difference between the two groups (p=0.058). Mixed failure modes were more common (93%) in both groups.

Conclusions: In terms of all tested parameters, the zirconia root copings were comparable to the gold copings.

Objectives: Using computer-aided design and manufacturing (CAD-CAM) technology in restorative dentistry increased the application of lithium disilicate (LD) materials. The bond strength to core and repairing materials is crucial in the restoration's longevity. This systematic review evaluates the shear bond strength (SBS) of CAD-CAM-LD restorative materials to other materials using different surface treatments.

Methods: An electronic literature search was performed through PubMed/Medline, Embase, Web of Science, Scopus, and Google Scholar. Studies were selected based on specific criteria. The risk of bias was assessed using the Joanna Briggs Institute Critical Appraisal Checklist for Quasi-Experimental Studies.

Results: Eleven studies were included, primarily investigating composite resin as the repair material. SBS values ranged from 0.82 to 32.96MPa, with the highest values observed for IPS e.max-CAD subjected to silicon carbide polishing, hydrofluoric acid (HF) etching, and silane application. For core materials, the highest SBS was reported for HFtreated IPS e.max-CAD bonded to tribochemically coated titanium and air-abraded zirconia, with SBS values ranging from 5.88 to 34MPa.

Conclusions: This review indicates that HF etching combined with silane application is the most effective method for improving bond strength in CAD/CAM-LD restorations. Applying surface treatments to both the core material and CAD/CAM-LD can further enhance bond strength.

This study evaluated the clinical performance of a polymer-infiltrated ceramic-network (PICN) material for up to 3 years. Patients (N=286) received 581 indirect restorations as crowns (417), overlays (131), and inlays/veneers (33) fabricated using the PICN (VITA Enamic) by CAD/CAM procedures using intraoral scanning (Cerec Omnicam) and milling systems (Cerec MC XL). The restorations were evaluated annually and in case of complications. Data were analyzed using Kaplan-Meier estimate. Complications were classified as biological or technical failures. Until final recall (mean observation period: 18.3 months) with a dropout rate of 4.8%, 3 biological and 10 technical complications were observed. The overall success rate of the placed restorations was 97.7%. Biological complications included pulpitis and pulp necrosis. Technical complications were debonding (n=7) and fracture (n=3). PICN materials can be used as an alternative to lithium-disilicate or zirconium dioxide for single tooth reconstructions, providing that early failures included debonding and fractures.

Purpose: To systematically review the literature and assess the success and survival rates of anterior composite restorations used in the management of anterior tooth surface loss, and to estimate complete posterior occlusion re-establishment when a Dahl approach is utilized.

Materials and methods: An electronic search was performed in the following databases: MEDLINE via Ovid and Scopus, for articles published from 1970 to November 2020. The systematic review was performed according to the PRISMA and Meta-analyses guidelines. Only randomized and non-randomized clinical trials, and Cohort studies that involved the exclusive use of direct/indirect anterior composite restorations for the management of localized anterior tooth wear were included.

Results: From the 724 studies identified through the initial search, six studies fulfilled the inclusion criteria and were included in the review; three prospective and three retrospective. In total, 141 patients received 1068 direct and indirect composite restorations. Follow-up periods ranged between 5 months and 10 years. The survival rate for anterior composite resin restorations reported in this review was 88% (95% CI: 70% to 98%) over a period of 2 and 10 years; however, high heterogeneity was observed amongst included studies; (I² = 97%). Sensitivity analysis reported survival rates of these restorations of 93% (95% CI: 85% to 98%) over a period of 2 and 7 years, (I² = 83%). Success rates were reported for these restorations of 68% (95% CI: 44% to 87%) over a period of 2 and 10 years, high heterogeneity; (I² = 98%). The success of composite Dahl in re-establishing posterior occlusion was 85% (CI: 73% to 94%).

Conclusions: The result of this systematic review and meta-analysis support the use of anterior composite restorations as a short-medium term option for the management of tooth wear. In the long-term, patients should be informed that these restorations will require monitoring, repairs, or replacements.

Purpose: The purpose of this invitro study was to assess the changes in the color attributes of high-translucency (HT) lithium disilicate and zirconia-reinforced lithium silicate in BL3/0M1, A1, A2, and A3 shades during first, second, and third firing cycles.

Materials and methods: Eighty specimens of two ceramic systems (IPS e.max CAD and Vita Suprinity) in BL3/0M1, A1, A2, and A3 shades, were prepared in thickness of 1 mm (n=10). Each group was subjected to 3 firing cycles and the CIE L*a*b* color parameters of specimens were measured after each firing cycle by a reflectance spectrophotometer. The color change (ΔE) between each two firing cycles was calculated by the relevant equation. Data were analyzed by one-way ANOVA and Tamhane post hoc test.

Results: All ΔE values were significant (P⟨0.001) except for ΔE2-1 (color difference between second and first firing) and ΔE3-2 (color difference between third and second firing) in A2 shade of IPS e.max (P=0.436) and ΔE2-1 and ΔE3-2 in 0M1 shade of Suprinity (P=0.345).

Conclusion: Repeated firing resulted in generally higher ΔE in ZLS than LDS, and 0M1 Suprinity experienced maximum ΔE after repeating firing.

The authors wish to acknowledge that the information on the Monet website⁹ has now changed (2024) to reflect that exposures longer than 3 seconds are required for larger restorations and that overlapping exposures should be used. The website now states that for preparation areas that are larger than 5mm in depth and 8mm in diameter, two overlapping spot cures of 3 seconds are recommended (Figure 2). The single 1 and 3x1- second exposure times used in the article are not recommended by the manufacturer and should now be considered 'off-label' use of the Monet.

This prospective clinical study evaluated the survival of indirect, posterior fiber-reinforced composite fixed dental prosthesis (FRC FDP). Between June-1999 and June- 2000, 58 patients received 65 FCR FDPs made of unidirectional E-glass fibers (Vectris) veneered with resin composite (Signum) that were adhesively cemented (Variolink II). The evaluation protocol involved technical (chipping, debonding or fracture of tooth/restoration) and biological failures (caries, endodontic complications). Altogether, 6 technical failures were observed after a mean observation time of 180 months (survival rate: 89.2%, Kaplan-Meier) in the form of fractures (n=2) and partial debondings (n=4). All defective restorations were repaired or recemented. Secondary caries occurred in one patient after 11 years. The 3-unit posterior FRC FDPs showed good clinical survival rate up to 15 years of clinical function. Limited numbers of experienced failures were due to mainly debonding followed by fracture of the veneering composite.g composite.

Introduction: Mandibular implant-supported overdentures (IODs) show higher retention than conventional complete dentures. However, there is no consensus on the best attachment to ensure resistance to vertical displacement. The most used are o-ring and bar-clip. This systematic review answered "Which type of attachment for overdenture prosthesis provides higher retention: o-ring or bar-clip?

Methods: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) was followed and registered in the International Prospective Register of Systematic Reviews (PROSPERO). The search was applied to 5 databases and grey literature. The selection process occurred in two blinded steps by the reviewers following the eligibility criteria: a randomized clinical trial comparing retention between o-ring and bar-clip in IODs. The risk of bias was analyzed by RoB II.

Results: 206 articles were found, and after removing the duplicates 136 were evaluated by title and abstract of which 24 were selected for full reading, 5 met the eligibility criteria, and all had a high risk of bias. The bar-clip provided higher retention than o-ring in four studies.

Conclusions: The bar-clip system provides a higher retention rate than the o-ring. In addition, the selection of attachment systems is dependent on the patient's anatomical-functional and economic conditions.

Objectives: This study aims to assess the impact of three different strategies of best-fit (BF) alignments of virtual casts on the estimation of the accuracy of intraoral scanner (IOS) in complete-arch scans.

Methods: A maxillary typodont, modified with an Implant Scan Body (ISB) in the retroincisive area, was digitized using a desktop scanner (SW Optor Lab) to obtain a reference STL file. The typodont was then scanned 10 times using two IOSs (Trios4, Itero). Each STL file obtained from the IOS was superimposed onto the reference cast using three methods in CloudCompare: full-arch BF (BF-full), BF at the starting tooth (BF-tooth), and BF at the ISB (BF-ISB). Discrepancies from the reference were recorded, and trueness and precision were compared for each method. Statistical analysis with the Kruskall-Wallis nonparametric test was performed (α = 0.05).

Results: The Kruskall-Wallis test (p ⟨0.05) revealed statistically significant differences in trueness and precision among the alignment methods. Post Hoc multiple comparison test p-values were all below the critical alpha value.

Conclusions: Differences in BF methods lead to significantly different accuracy values of IOS complete-arch scans as different virtual casts' alignment discrepancy. BF-full had the highest accuracy followed by BF-ISB and BF-tooth.

The objective of this systematic review was to investigate the incidence of debonding of fiber posts in root canal-treated teeth with a focus on the cementation strategy employed. This study was registered at PROSPERO (sob number: CRD42022334791). Six databases were searched, in addition to the gray literature. Two independent reviewers performed the selection of the studies as well as data collection. The risk of bias was assessed using the QUIPS (Quality in Prognosis Studies) tool. A meta-analysis was carried out to verify the overall incidence of debonding and the influence of different variables. Random effects were adopted, with a confidence interval (CI) of 95%. Twentynine studies met the eligibility criteria. The overall incidence of debonding was 2.7% (CI: 2.1-3.6%). Similar debonding rates were found when using total-etch and self-adhesive systems while a trend towards a higher debonding rate was observed for self-etch systems. Posterior teeth presented a higher incidence of debonding (3.9%) (CI: 2.5-6.0%) than anterior teeth (1.6%) (CI: 1.0-2.5%). A higher debonding incidence was found when 2 or fewer coronal walls were reported at 3.5% (CI:2.0-5.9%). Debondings in fiber posts are multifactorial, with no direct cementation strategy influence.