暂时封固对根管治疗牙冠方微渗漏影响的体外研究

In vitro study of influence of temporary fillings on coronal microleakage of endodontically treated teeth

目的评价不同暂封材料、暂封方式对根管治疗牙冠方微渗漏的影响,探讨根管治疗牙冠方微渗漏发生情况及与时间的关系。方法收集离体牙,常规根管治疗后随机分组,2%亚甲基蓝染色,制作透明样本,体视显微镜下观察样本微渗漏情况,根据染料渗漏最大长度评分,收集数据并进行统计分析。结果暂封1、4周时,Cavit-G和Caviton微渗漏评分低于氧化锌丁香酚水门汀(ZOE);暂封2周,Caviton微渗漏评分低于ZOE和Cavit-G。ZOE作为暂封材料,两种方式样本微渗漏评分比较差异无统计学意义(P>0.05);暂封1周时,Cavit-G和Caviton直接与间接暂封微渗漏评分差异无统计学意义(P>0.05),暂封2周,Cavit-G和Caviton微渗漏评分差异无统计学意义(P>0.05)。随暂封时间的延长,3种材料的微渗漏差异有统计学意义(P<0.05)。结论 Caviton冠方暂封效果最好,其次为Cavit-G,ZOE最差;间接暂封明显加速Cavit-G和Caviton暂封样本冠方微渗漏;Caviton和Cavit-G用于暂封的适宜时间为2周,ZOE为1周。

Objective To evaluate the influence of temporary filling materials,filling methods on coronal microleakage of endodontically treated teeth;to discuss the influence of time on the sealing ability of coronal temporary fillings.Methods Extracted teeth were randomly divided after treated with root canal therapy.The samples were stained with 2% methylene blue then made clearing specimens.The specimens were evaluated under stereomicroscope and blindly scored for microleakage.The data collected were then analyzed statistically.Results Comparison of various sealing materials：the microleakage scores of ZOE were higher than that of Cavit-G and Caviton in 1 week and 4 weeks;whenever in 2 weeks,the microleakage of Caviton was the lowest of the three.Comparison of filling methods：there was no statistically significant difference between the two filling methods of ZOE group（P 0.05）.Directly or indirectly sealing for 1 week,the microleakage scores of Cavit-G and Caviton had no statistically significant difference（P 0.05）,while there were statistically significant differences when sealing for 2 or 4 weeks（P 0.05）.Influence of sealing time：with the proloning of sealing time,the microleakage scores of the three types of materials increased significantly（P 0.05）.Conclusions Amongst the three materials,Caviton was better than the other two.Usage of cotton pellets increased the coronal microleakage of Cavit-G and Caviton.The optimum time of temporary fillings was 2 weeks for Caviton and Cavit-G,and 1 week for ZOE.