单尖法和热牙胶法根管充填根尖封闭性能的比较研究

目的 比较3种封闭剂AH-Plus, iRoot SP和GuttaFlow2分别配合单尖法充填和热牙胶充填的根尖封闭性能。方法 选取近期拔除的70颗单根管前磨牙，截冠后采用Waveone gold系统预备至P#,随机分为6个实验组(每组10颗)和2个对照组(每组5颗)。分别行单尖法充填和热牙胶充填，即AH-Plus单尖法组(A1组),AH-Plus热牙胶组(A2组),iRoot SP单尖法组(B1组),iRoot SP热牙胶组(B2组),GuttaFlow2单尖法组(C1组),GuttaFlow2热牙胶组(C2组),阳性对照组(D组)和阴性对照组(E组)。将充填完成的牙齿进行染料渗透实验后，通过纵切片法检测根尖的微渗漏情况。结果 A1组微渗漏值最大，B2组微渗漏值最小，同种封闭剂下单尖法充填和热牙胶充填根尖封闭性差异无统计学意义(P>0.05),同种充填技术下3种封闭剂的封闭性差异无统计学意义(P>0.05)。结论 3种根管封闭剂均不能完全封闭根管，单尖法充填和热牙胶充填在根尖封闭效果上无显著差异。

A comparative study on apical sealing performance between single cone obturation and warm gutta-percha root canal filling

Objective To compare the sealing performance of three kinds of sealers AH-Plus, iRoot SP and GuttaFlow2 combined with single cone obturation and warm gutta-percha root canal filling. Methods Seventy premolars with single root canal were extracted recently and prepped to P# by Waveone gold system after truncating tooth crown. Then they were randomly divided into 6 experimental groups (10 premolars per group) and 2 control groups (5 premolars per group). Single tip filling and warm gutta-percha filling were performed, namely AH-Plus single tip filling group (A1), AH-Plus warm gutta-percha filling group (A2), iRoot SP single tip filling group (B1), iRoot SP warm gutta-percha filling group (B2), GuttaFlow2 single tip filling group (C1), GuttaFlow2 warm gutta-percha group (C2), positive control group (D group) and negative control group (E group). After dye penetration test was performed on the filled teeth, microleakage of root tip was detected by longitudinal section method. Results A1 group had the largest microleakage value, while B2 group had the smallest microleakage value. There was no statistically significant difference in apical sealing between single-tip filling and hot dental glue filling with the same sealant (P>0.05), and also no statistically significant difference in apical sealing between the three kinds of sealant with the same filling technology (P>0.05). Conclusion None of the three root canal sealers can completely seal the root canal, and there is no significant difference in the sealing effect between single tip filling and warm gutta-percha filling.