三种根管暂封材料冠方微渗漏的体外研究

摘要

目的:探讨3种暂封材料冠方微渗漏的情况.方法:收集28颗近期拔除的单根管前磨牙,将离体牙随机分为Cimavit组、Caviton组、氧化锌丁香酚水门汀组(每组8颗)、阳性对照组和阴性对照组(每组2颗).2％亚甲基兰染色1周,纵剖牙齿,体视显微镜下观察染料渗入最大深度.结果:各组均出现不同程度的渗漏,阳性对照组可见整个根管被染色,阴性对照组无染料渗漏到牙齿内,实验组微渗漏深度分别为(2.12±0.69)mm、(2.27±0.74)mm、(3.23±0.50)mm.3组微渗漏深度差异有统计学意义(P＜0.01),其中Cimavit组和Caviton组微渗漏深度差异无统计学意义(P＞0.05).结论:暂封时间为1周时,Cimavit暂封膏、Caviton暂封膏的总体暂封效果优于氧化锌丁香酚水门汀.%Objective To discuss the coronal microleakage of three temporary restorative materials. Methods Twenty eight single rooted premolar were instrumented and randomly divided into five groups, which were Cimavit group, Caviton group,Zinc oxide eugenol paste group (8 teeth for each group),the positive control group and the negative control group (2 teeth for each group).AII teeth were immersed in 2% methylene blue solution for 1 week and sectioned along the longitudinal axis.The dye penetration were viewed under stereomicroscope and the greatest depth was selected and recorded for each specimen. Results No perfect temporary restorative material existed,The positive control group achieved maximum dye penetration and the negative control group showed no dye penetration.The means of dye penetrative length for three experimental groups were respectively (2.12 0.69)mm,(2.27 0.74)mm and (3.23 0.50) mm.There were statistical differences among the three groups (P<0.01).The microleakage depth of Cimavit and Caviton had no statistically significant difference (P>0.05). Conclusion The effect shows Cimavit and Caviton temporarily closed higher than the effect of Zinc oxide eugenol paste in 1 week.