【摘要】 目的:测试自行合成的纳米金刚石改性的核树脂(UFD-C)与三种材料纤维桩的微拉伸粘结强度。方法:选择石英纤维桩、玻璃纤维桩、碳纤维桩各10个,每种随机分成2组。在桩周分别用UFD-C或Luxa-Core(L-C)商品核树脂充填,用低速锯沿纤维桩外周平行片切,再垂直粘结面片切成约0.9mm×0.9mm的长方形柱状试件,每组共15个试件。测试其粘结强度,并观察其断裂类型。结果:UFD-C与三种纤维桩的微拉伸粘结强度分别为20.08±2.79MPa、17.78±5.70MPa、20.12±3.78MPa;L-C与三种纤维桩的微拉伸粘结强度分别为21.09±3.64MPa、23.55±3.41MPa、18.12±3.80MPa。L-C与玻璃纤维桩的微拉伸粘结强度高于UFD-C与玻璃纤维桩,差异有统计学意义(P<0.05),2种核树脂与石英纤维桩和碳纤维桩的粘结强度差异无显著性(P>0.05)。体视显微镜观察92%试件是粘结界面的断裂。结论:纳米金刚石改性核树脂与石英纤维桩、碳纤维桩的微拉伸粘结强度与商品Luxa-Core核树脂相当,能满足牙体缺损修复的要求。更多还原

【Abstract】 Objective: To evaluate the microtensile bond strength (μTBS ) between two kinds of core build-up composites (Ultrafine Diamond Core, UFD-C; Luxa Core, L-C) and three types of fiber posts in vitro. Methods: For the microtensile nontrimming technique, 15 beam-shaped specimens per group were obtained from cylinders of core material which had been built up by progressively adding small increments of composite resin around the post. Each specimen was loaded in tension until failure and the interfaces present was observed. Results: The mean value(SD)on μTBS of UFD-C was 20.08(2.79)MPa for quartz fiber post, 17.78(5.70)MPa for glass fiber post, and 20.12(3.78)MPa for carbon fiber post. The mean value(SD)on μTBS of L-C was 21.09(3.64)MPa for group quartz fiber post, 23.55(3.41)MPa for group glass fiber post, and 18.12(3.80)MPa for carbon fiber post. There were no significant differences of the μTBS between UFD-C and L-C to quartz fiber post and carbon fiber post (P >0.05). The μTBS of L-C to glass fiber post was significantly higher than that of the UFD-C to glass fiber post (P <0.05). 92% of the was fracture mode adhesive failure. Conclusions: Ultrafine Diamond Core was as suitable for restoration of defected teeth with quartz fiber post and carbon fiber post as commercial core materials.更多还原