【摘要】 目的:采用扫描电镜观察3种脱敏剂对新鲜暴露的牙本质表面形貌的影响,评价其对牙本质小管的封闭作用。方法:16个离体前磨牙样本预备至暴露牙本质后,根据脱敏剂不同分为对照组(n=4)、Hybrid Coat组(n=4)、Prime&Bond NT组(n=4)、脱敏牙膏组(n=4)。涂布脱敏剂后,每组选取1/2的样本纵向劈开。最后,用扫描电镜观察牙本质的表面和剖面形貌。结果:Hybrid Coat,Prime&Bond NT,脱敏牙膏均能有效封闭牙本质小管,其中Hybrid Coat,Prime&Bond NT几乎能封闭所有的牙本质小管口,而脱敏牙膏涂布后有少量牙本质小管口开放。剖面图显示除对照组外,所有组均可见沉积物。结论:Hybrid Coat和Prime&Bond NT能有效封闭牙本质小管,而脱敏牙膏封闭作用稍差。更多还原

【Abstract】 Objective: To explore the effects of three dentine desensitizers on the surface morphology of freshly exposed dentin and to evaluate their occlusion effects on dentinal tubules using scanning electron microscope(SEM).Methods: A total of 16 isolated human premolar samples, which were prepared to expose dentine, were randomly divided into a control group(n=4), a Hybrid Coat group(n=4), a Prime & Bond NT group(n=4), and a anti-sensitivity toothpaste group(n=4). After treatment with dentine desensitizers, one half of the samples in each group were vertically cleaved. Finally, the surfaces and cross sections of the samples were observed by SEM.Results: The exposed tubule was almost occluded in the Hybrid Coat group and the Prime & Bond NT group, while only the majority of tubules could be sealed in the anti-sensitivity toothpaste group. The cross-section images showed that sediments were visible in all groups except the control group.Conclusion: Hybrid Coat and Prime & Bond NT are able to effectively seal tubules, while the effect of anti-sensitivity toothpaste is slightly poor.更多还原