粘固剂种类及牙体预备时机对纤维桩冠方微渗漏的影响

背景：牙体预备过程中高速涡轮机振动可破坏粘固剂与牙根、粘固剂与桩界面内的连续作用力,影响桩核的冠方封闭效果。目的：观察不同种类的粘固剂在不同时机行牙体预备对纤维桩冠方微渗漏的影响。方法：下颌单根管前磨牙随机分成3个实验组,在桩道预备后分别用Rely X luting、Panavia F、Paracore 5 mL粘接纤维桩。3个实验组内随机分成A,B,C 3个亚组,分别在粘固剂调和15,45,90 min后进行牙体预备后,经染色及透明化处理。在体式显微镜下记录各亚组微渗漏得分。结果与结论：同一牙体预备时机下,Rely X luting对纤维桩造成的冠方微渗漏影响最明显,Panavia F其次,Paracore 5 mL则最少;同一种粘固剂完全固化后,不同牙体预备时机对纤维桩冠方微渗漏无影响。关键词：粘固剂;纤维桩;牙体预备;微渗漏doi:10.3969/j.issn.1673-8225.2010.03.019

Effect of different types of cements and the timing of tooth preparation on the coronal microleakage of fiber post

BACKGROUND: The vibration of high speed handpiece during tooth preparation may have adverse effect on the continuous force of the bonding interfaces among the cement, dentin, and post core.OBJECTIVE: To find the effect of different types of cements on the coronal microleakage of fiber post under different tooth preparation timings, and to provide evidence for the clinical operation.METHODS: The extracted mandibular premolars were divided into 3 groups, and they were cemented by Rely X luting, Panavia F and Paracore 5 mL, respectively. Each group was averagely divided into 3 subgroups: A, B, C groups which were prepared 15 minutes, 45 minutes, and 90 minutes after the cements mixed. All roots were then dyed and transparented. The teeth were observed under stereoscopic microscope and the dyeing scores were also recorded.RESULTS AND CONCLUSION: Rely X luting caused the highest coronal microleakage of fiber post, followed by Panavia F, while Paracore 5 mL brought about the lowest under the same tooth preparation timing. Different tooth preparation timing caused no significant effect on the coronal microleakage of fiber post when the cement had been completely set.