1,721,046 research outputs found
Pilot Evaluation of Four Experimental Conditioning Treatments to Improve the Bond Strength between Resin Cement and Y-TZP Ceramic
No full textPurpose: This study evaluated the bond strength between resin cement and Y-TZP ceramic (Yttrium-stabilized Tetragonal Zirconia Polycrystalline) submitted to different surface conditionings. Materials and Methods: Fifty Y-TZP ceramic discs (Ø= 10 mm) were allocated into five groups: Gr1 (control)-no conditioning; Gr2-tribochemical silica coating (30-μm SiO(2) ) before sintering; Gr3-air abrasion with 50-μm Al(2) O(3) before sintering; Gr4-air abrasion with 110-μ Al(2) O(3) before sintering; Gr5 - air abrasion with 50-μm Al(2) O(3) after sintering. After specimen preparation, cylinders of composite resin were prepared and immediately cemented onto the ceramic. A shear test was performed. Results: One-way ANOVA indicated a statistically significant difference among the groups (p= 0.0019). The mean shear bond strengths (MPa) were: Gr1 = 4.7 ± 0.8,(b) Gr2 = 4.6 ± 0.9,(b) Gr3 = 6.4 ± 1.0,(a) Gr4 = 6.5 ± 1.8,(a) Gr5 = 6 ± 1.3(ab) (same superscript letter indicates statistical similarity). Adhesive fracture between the ceramic and resin cement was the most common failure. No complete cohesive fracture at the ceramic or composite cylinders was noted. Conclusion: Within the limitations of this study, additional surface treatment with air abrasion before and after sintering provided a significant increase in bond strength. Tribochemical silica coating before sintering was not effective as a surface treatment
Three-point bending test simulation on implant FPDS with a bio-faithful model
No full textIt is well known by previous important studies that mandible flexes during different jaw movements. According to this assumption it is very important to know how implant supported fixed partial dentures could restrict mandibular movements and, could lead to excess strain accumulation that could modify the resolution of implant treatment. The aim of our project is to create a bio-faithful model able to recreate mandibular movements, during three point bending test methods of (FIXED -PARTIAL -DENTURES) FPDs, to avoid a not flexible metal base, where models' properties doesn't allow to obtain a bio-faithful simulation during testing phases
ECC full rehabilitation with indirect composite restorations: A case report
No full textBaby Bottle Syndrome, also known as Early Childhood Caries, is a diffuse decay condition of dental hard tissues in deciduous dentition. During the night, Streptococcus mutans and Streptococcus sobrinus ferment carbohydrates from food and beverages, producing lactic acid that induce enamel demineralization. This case report describes the treatment of a small patient with severe loss of dental tissue both in the anterior superior area and the posterior sectors. Aim of this case report was to describe a complete rehabilitation of the posterior and canine areas with indirect composite restorations
immediate single implant placement and loading in the aesthetic zone with a novel dental implant: a 1-year prospective single cohort study
No full textthis prospective single-cohort study aimed to evaluate the clinical and radiological performance of a novel dental implant positioned in post-extraction sockets in the anterior zone of both jaws and immediately loaded after 1 year in function. MATERIALS AND METHODS: patients requiring single implant in the anterior zone were treated between january and march 2019 and followed for at least 1 year of function. minimum values of 35 Ncm or 64 ISQ were required to perform immediate loading. Screw-retained zirconia-based single prostheses were delivered after the healing period. patients were followed up for 1 year after definitive prosthesis placement to determine implant and prosthetic survival rate, marginal bone loss (MBL), insertion torque, and ISQ values.RESULTS: 40 implants (bonelevel X, straumann AG) were positioned in 60 patients. none of the positioned implants failed accounting for an implant survival rate of 100 %. no definitive prostheses failed to result in a 100% prosthetic success rate. mean MBL was 0.6 mm ± 0.4 mm. mean overall insertion torque was 58.9 ± 13.8 while mean overall ISQ at implant placement was 72.3 ± 8.1.CONCLUSION: Within the limitations of the present prospective single-cohort study, the investigated clinical and radiological performance of the novel dental implant placed in the anterior zone seems to be a reliable treatment option
Mechanical evaluation and fem analysis of stress in fixed partial dentures zirconium-ceramic
No full text
Periodontal conditions and preterm low birth weight|Condizioni parodontali e nascita pretermine e sottopeso
No full text
- …
