纳米金刚石改性核树脂与三种纤维桩粘结的超微形态学研究

Micromorphology of the fiber post-resin core unit:a scanning electron microscopy evaluation with the microtensile bond test

目的:对比研究自行合成的改性纳米金刚石核树脂(UFD-C)和商品Luxa-Core(L-C)核树脂与石英纤维桩、玻璃纤维桩、碳纤维桩进行微拉伸粘结强度测试后试件的断裂类型,研究粘结界面和断裂面的超微形态特征,为临床应用提供参考。方法:选择UFD-C、L-C分别与石英纤维桩、玻璃纤维桩、碳纤维桩制作的微拉伸粘结试件各15个,用微拉伸仪进行微拉伸粘结强度测试,用体视显微镜观察断裂类型,用环境扫描观察粘结界面和断裂面的超微形态特点。结果:UFD-C、L-C核树脂与3种材料纤维桩断裂类型92%为粘结界面断裂,2种核树脂与3种纤维桩粘结面超微形态无明显差异。结论:纳米金刚石改性的核树脂(UFD-C)、Luxa-Core(L-C)核树脂与3种纤维桩的粘结面粘结良好,核树脂和纤维桩类型对断裂模式无明显影响。

Objective： To evaluate the fi＇actttre mode and the micromorphology of the bonding unit of the microtensile bond specimens of two types of core build-up composite （Ultrafine Diamond Core, UFD-C, Luxa Core, L-C） to three types fiber post in vitro. Methods： Six experimental groups were used. 15 beam-shaped specimens per group were obtained, each specimen was loaded in tension until failure at either one of the two post/core interfaces presented in each stick. Each failed specimen was observed with optical microscope, and ESEM was used to observe the micromorphology of the bonding unit. Results： The adhesive failure was the most predominant mode of fi-acture. There was no significant difference between the ESEM micrographs of the fi＇acture in the adhesive for the fiber post-resin unit. Conclusions： The bonding unit of two types of core build-up composite （Ultrafine Diamond Core, UFD-C, Luxa Core, L-C） to three types fiber post is good. There is no significant difference between the tracture mode of two types of core build-up composite to three types fiber post.