摘要：OBJECTIVE: The aim of this study was to compare fracture strength of fiber reinforced indirect composite systems (SR Adoro/Vectris and BelleGlass NG/Construct) with a full ceramic system (IPS Empress 2). Moreover, the effect of 2 different margin preparations (1 mm chamfer and0.8 mm shoulder preparation) on fracture strength was evaluated. MATERIALS AND METHOD: Preparing 20 crown samples from each material group, ten from chamfer and ten from shoulder, a total of 60 samples were subjected to fracture strength test. Lloyd LRX universal testing device and Nexygen computer software were used to evaluate fracture resistance of the samples. RESULTS: The results were measured in Newton and the data were statically evaluated using Kruskal Wallis test. As a result of statical evaluations, fracture strength of fibrereinforced indirect composite materials was found to be greater than that of full ceramic system IPS Empress. While the fiber-reinforced composite system BelleGlass NG/Construct had the highest fracture strength values, IPS Empress full ceramic system had the lowest fracture resistance values. (IPS Empress 2: 845.95±119.7 N, SR Adoro/Vectris: 942.67±136.6 N, BelleGlass NG/Construct: 1187.93±383.5 N). Besides, it was found that the shoulder preparation ensured a more resistant crown structure than the chamfer preparation did. CONCLUSION: It was concluded that the fiber-reinforced indirect composites’ fracture strength was greater than that of the full ceramic system, and that the shoulder preparation formed a more resistant structure than the chamfer preparation.
