摘要
标准尺寸的有机玻璃模拟上中切牙牙根试件54个,分为桩道聚合度为0°、3.93°、5.71°、7.48°、11.31°、14.71°六组,制备铸造桩核后磷酸锌粘固剂粘固,进行拉伸试验测得固位力。用铸造圆片测试不同聚合度时的平面粘接力,换算出不同聚合度时的单位面积粘接力,计算出桩固位力中粘接力的大小以及摩阻力大小和所占比例。并对固位力、摩阻力、单位面积粘接力、单位面积固位力、单位面积摩阻力对聚合度之间进行回归分析。结果显示桩固位力和摩阻力、磷酸锌粘接力随聚合度增大而减小,统计分析组间有差异,P<0.05,本试验显示为了获得较大的固位力,临床医生应该尽可能减少桩的聚合度。
Fifty-four simulated tooth roots made of polymethacrylate （PMMA） were divided into six groups according to the root canal convergence angles of 0°,3.93°,5.71°,7.48°,11.31°,14.71°. Cast post and cores were manufaetured and cemented with Zinc phosphate cement（ZP）. The retention eapaelties of the posts were tested. The bonding strength of ZP at different convergence angles were tested with some casted wafers, and linear regression was made. So the effeet of interlocking and the proportion could be calculated. With these results, we made some eurvilinear regressions. The results showed that the retention of cast post declined and the bonding strength of ZP fell with the increase of eonvergence angles. There were signlficant differenees in the bonding strength and retention among groups, P〈0. 05. The experiment indicates that the dentists should reduce the eonvergence angles of posts as much as possible to obtain greater retention.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2006年第2期329-333,共5页
Journal of Biomedical Engineering
关键词
桩核
固位力
粘接力
Cast metal post Retention Bonding
