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目的:评价光照模式和时间对树脂粘接剂微拉伸粘接强度的影响。方法:选取40颗完整的人磨牙,磨平牙冠,露出面牙本质,分成两组,分别涂布粘接剂one-step plus(OS)和clearfil-se-bond(SE)。根据粘接剂光照模式及时间的不同每组又分为4亚组(n=5),分别为传统光照模式(fast)和软启动光照模式(ramp):fast 10 s、fast 15 s、ramp 20 s和fast 20 s。牙本质面分层充填树脂,水储存1周,检测微拉伸强度,体视显微镜下观察断裂模式。采用多因素方差和LSD多重检验统计数据(α=0.05)。结果:OS组的fast 10 s、ramp 20 s和fast 20 s之间微拉伸强度无显著差异,fast 15 s显著低于ramp 20 s和fast 20 s组。SE组:fast 20 s>ramp 20 s>fast 10 s和fast 15 s,fast 20 s远高于其它各组。结论:在本实验中,软启动技术不能显著提高粘接剂的微拉伸粘接强度;传统光照20 s可显著提高clearfil-se-bond的微拉伸粘接强度;one-step plus的光照仍推荐为传统光照10 s。
Objective: To evaluate the effect of light pattern and time on the microtensile bond strength of resin adhesive. Methods: Forty intact human molars were selected and their crowns crowned to reveal the dentine dentin. Two groups were enrolled. One-step plus (OS) and clearfil-se-bond (SE) Each group was further divided into 4 subgroups (n = 5) according to the light pattern and time of the adhesive, which were the traditional light fast and soft start light ramps respectively: fast 10 s, fast 15 s, ramp 20 s and fast 20 s. Dentin surface layer filled resin, water storage for 1 week, the micro-tensile strength was detected under stereomicroscope microscopy fracture mode. Multivariate analysis of variance and LSD multiple test statistics (α = 0.05) were used. RESULTS: There was no significant difference in microtensile tensile strength between fast 10 s, ramp 20 s and fast 20 s in OS group, and fast 15 s was significantly lower than those in ramp 20 s and fast 20 s groups. SE group: fast 20 s> ramp 20 s> fast 10 s and fast 15 s, fast 20 s is much higher than the other groups. Conclusion: In this experiment, the soft-start technology can not significantly improve the microtensile bond strength of the adhesive; the traditional light of 20 s can significantly improve the microtensile bond strength of clearfil-se-bond; the one-step plus illumination Still recommended for traditional lighting for 10 s.