摘要
目的 观察流动复合树脂表面封闭层的耐磨性及其在提高粘接托槽牙面抗磨耗性能方面的作用.方法 40颗离体前磨牙随机分为未脱矿组、自酸蚀组、直接脱矿组、表面封闭后脱矿组,每组10颗.恒温水浴及冷热循环后,直接脱矿组、表面封闭后脱矿组置0.1M的乳酸胶脱矿48h,将4组离体前磨牙制成试件,牙刷磨耗31000次,扫描电镜观察颊面牙釉质结构及封闭层改变情况.结果 磨耗后,未脱矿组牙面未见刷痕;自酸蚀组、直接脱矿组牙面刷痕较深;表面封闭后脱矿组表面封闭层仍保留在牙面;流动复合树脂表面封闭层磨耗前、后的平均厚度（μm）是167.58±6.38、140.93±7.88,平均磨耗量（μm）是26.85±4.48,经配对t检验,磨耗前、后流动复合树脂表面封闭层厚度差异有统计学意义.结论 牙刷磨耗可磨去部分流动复合树脂,但不能去除流动复合树脂表面封闭层;表面封闭法能够提高粘接托槽牙面抗磨耗性能.
Objective To study the wear resistance of the layer of the surface sealing with flowable composite resin and the surface sealing improve the wear resistance of the enamel bonded with bracket. Methods Forty extracted premolars were chosen for the study. They were divided into four groups, ten premolars in each group： undemineralizing group, self-etching group, direct demineralizing group, demineralizing after surface sealing group. The teeth in the later two groups were demineralized by 0.1M lactic acid gelatin for 48h after thermostat water bathing and thermocycling.The microstructure of the buccal surface of the enamel and the change of the surface sealing layer were observed through scanning electron microscope after the toothbrush wear testing 31,000 times.Results After wearing, the brush mark couldn＇t be seen in the undemineralizing group. The brush mark was deeper in the self-etching group and the direct demineralizing group. In the demineralizing after surface sealing group, the layer of surface sealing with flowable composite resin was still on the buccal surface of the sealed teeth. The average thickness of the layer of the flowable composite resin was 167.58±6.38μm、140.93±7.88μm between before and after wear. The average wear quantity was 26.85±4.48μm. After the paired samples T test, the thickness of the layer of the flowable composite resin between before and after wear revealed statistically significant differences. Conclusion Demineralization decreases the wear resistance of the enamel bonded with bracket. Some flowable composite resin was removed after wear, but the layer of surface sealing with flowable composite resin was still on the buccal surface of the sealed tooth to improve the wear resistance of the enamel bonded with bracket.
出处
《中华口腔正畸学杂志》
2010年第2期77-80,共4页
Chinese Journal of Orthodontics
关键词
表面封闭法
流动复合树脂
磨耗
固定正畸
Surface sealing
Flowable composite resin
Wear
Fixed orthodontics
作者简介
通信作者：曹军，Email：wykun@fmmu．edu．cn，电话：029-84776138
