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Shear Bond Strength of Three Porcelain Repair Systems on Porcelain in Dry and Aged Conditions

Gülce Subasi*,Özgür Inan

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.