不同器械根管预备效果的实验研究

目的：比较临床常用扩锉器械的根管清理效果。方法：将60个离体牙随机分为6组，分别为空白对照组、K型钻组、K型钻和锉组、K型钻和H型锉组、K型锉组和超声扩锉组，采用逐步后退法预备根管。扫描电镜观察根管内壁。结果：根管壁碎屑面积比较，K型锉组＞K型钻组＞K型钻和锉组＞空白对照组＞K型钻和H型锉组＞超声扩锉组，且前3组与其余各组之间具有显著性差异（P＜0．05），而后3者之间无显著性差异（P＞0．05）。结论：超声扩锉与K型钻和H型锉效果最好；K型钻与K型锉交替使用次之；单纯扩或锉不能有效进行根管清理。建议临床采用K型钻和H型锉交替预备根管。

Experimental study on effects of root canal preparation by different instrumentation

AIM: To investigate the effects of root canal preparation by different instrumentation. METHODS: The fresh extracted 60 single-rooted teeth were collected,then random distributed in 6 groups with 10 of each. Group 1, the negative control; group 2, reaming instrumentation with reamers only; group 3, reaming and filing instrumentation with reamers and K files; group 4, reaming and filing instrumentation with reamers and H files; group 5, filing instrumentation with K files only; group 6, the ultrasonic instrumentation. The effects of canal preparation were evaluated by Scanning electron microscopic photomicrographs. RESULTS: The debris area of the root canal wall of group 5 was the largest, followed by group 2, group 3, group 1, group 4 and group 6. There was significant difference between the group5/group2/group3 and the other groups(P<0.05). However, there was no significant difference among the last three groups(1,4&6) (P<0.05). CONCLUSION: The effect of the ultrasonic treatment and the reamer and H file treatment were the best. K file or reamer file can not effectively remove the debris. The result is useful for the canal preparation in endodontic therapy.