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目的:对比研究0.02锥度和0.06锥度牙胶尖冷侧压充填后根尖封闭效果。方法:收集离体单根管前牙53颗,经根管清理、机用ProTaper预备成型后随机分为2个实验组和1个阳性对照组,实验组每组26个样本,对照组1个样本。实验组分别用0.02锥度牙胶尖和0.06锥度牙胶尖作主尖冷侧方加压进行充填,阳性对照组不进行充填。用透明标本法配合染料渗透技术测量根尖染料的线性渗透长度,评价各组标本的根尖封闭效果。结果:阳性对照组标本染料全部进入根管。0.02锥度组染料渗透长度(0.761±0.457)mm,0.06锥度组(0.906±0.490)mm,差异无统计学意义(P>0.05)。结论:机用ProTaper预备根管后,冷牙胶侧方加压充填时0.06锥度牙胶尖和0.02锥度牙胶尖的根尖封闭效果差异无统计学意义。
OBJECTIVE: To compare the apical sealing effect of 0.02 taper and 0.06 taper gullet after cold lateral pressure filling. Methods: Fifty-three anterior teeth of single root canals were collected and cleaned by root canal. The rats were randomly divided into two experimental groups and one positive control group after ProTaper was prepared. There were 26 samples in each group and 1 control group sample. The experimental group were filled with 0.02 taper gutta percha and 0.06 taper gutta percha sharply, while the positive control group was not filled. Transparent specimen method with dye penetration technique was used to measure the linear infiltration length of apical dye and apical sealing effect of each group was evaluated. Results: The positive control group all the dye into the root canal. In the 0.02 taper group, the dye penetration length (0.761 ± 0.457) mm and 0.06 taper group (0.906 ± 0.490) mm, the difference was not statistically significant (P> 0.05). Conclusions: There is no significant difference in apical sealing effect between 0.06 taper gutta percha and 0.02 taper gutta percha margin after ProTaper machine pre-canal preparation.