关键词: 树脂贴面, 高强纤维树脂, 折裂载荷, 折裂模式

Abstract: Objective　Toexplore the effectof fiber-reinforced composites on the fracture load and fracture mode of resin veneer cemented with different types of fiber-reinforced composite(FRC). Methods　30 maxillary incisors were randomly divided into 3 groups. Group1 was restored with composite veneers. Group 2 was restored with composite veneer reinforced with FRC in one direction. Group 3 was restored with composite veneer reinforced with FRC in two directions. All specimens were thermocycled. Initial fracture loads and final fracture loads were tested with a universal testing machine. Fracture modes of different groups were observedand studied.Results　For the initial fracture load, there was no statistically significant difference(P>0.05)among the test groups. According to the statistical results, the final fracture loads had no significant difference (P>0.05) between Group 2 and Group 3. The final fracture load of Group 1 was significantly lower than Group 2 and Group 3(P<0.05). In Group 2 and Group 3, the final fracture loads were significantly higher than the initial fracture loads (P<0.05). Repairable small fractures were observed in most specimens of Group 3, and irreparable fractures were observed in specimens of Group 1 and Group 3. Conclusions　FRC is helpful to increase final fracture load of composite resin veneer. And the fractured resin veneer is more convenient to be repaired by the reinforcement of bidirectional FRC.