Abstract
Objective: This study compared the durability of bond strength of a resin composite to feldspathic ceramic by using three porcelain repair systems. Methods: Sixty ceramic blocks (Vitablocks Mark II) were divided into three groups, according to the repair method (CO [Cojet repair kit], CL [Clearfil repair kit], and UL [Ultradent repair kit]). Composite resin was photo-polymerized on each ceramic. Half of the specimens were submitted to the shear bond strength test after 24 hours of water storage or thermal cycling. The bond strength data was analyzed by Weibull analysis and Wald tests (p=0.05). Results: The characteristic bond strength values (σ0 ) of repair systems in dry conditions were 5.823, 6.512 and 6,867 MPa and after aging conditions these were 4.112, 3.935 and 4.210 MPa for CO, CL and UL, respectively. Wald test results revealed that there were significant differences among groups in characteristic bond strength (σ0 ) (p<0.001). Conclusion: Thermal cycling had a significant effect on the bond strength of three repair kits and bond strength results decreased after thermal cycling.
Highlights
Increased patient demand for aesthetic and metal-free restorations has resulted in the progress of all-ceramic restorations
Various methods have been reported to repair fractured porcelain with composite. These methods include sandblasting with aluminum oxide (Al2O3) particles, roughening with a diamond bur, etching porcelain surfaces with hydrofluoric acid or acidulated phosphate fluoride gel, and a tribochemically silica-coating system
Cojet Repair Kit (CO): Ceramic surfaces were air-abraded using an intraoral device (Cojet) that was filled with 30-μm alumina particles coated with silica (Cojet Sand) from a distance of approximately 10 mm and at a pressure of 3 bar for 15 seconds
Summary
Sixty ceramic blocks (Vitablocks Mark II) were divided into three groups, according to the repair method (CO [Cojet repair kit], CL [Clearfil repair kit], and UL [Ultradent repair kit]). Composite resin was photo-polymerized on each ceramic. Half of the specimens were submitted to the shear bond strength test after 24 hours of water storage or thermal cycling. The bond strength data was analyzed by Weibull analysis and Wald tests (p=0.05)
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