EDTA 在后牙钙化闭塞根管预备中的应用研究

目的：钙化闭塞根管严重影响根管治疗效果，通过观察EDTA糊剂在钙化闭塞根管预备中的应用，评价其临床疗效。方法：选取2009年3月-2012年3月本院牙体牙髓科就诊的124例患者，140颗后磨牙，165个钙化闭塞根管，所有的患者按照随机数字表法分为A组和B组各62例。A组62例68颗后磨牙83个钙化闭塞根管采用EDTA糊剂导入根管闭塞处进行根管预备，或根管内暂封EDTA一周后再进行根管预备。而B组62例72颗后磨牙，82个钙化闭塞根管采用氯亚明配合根管预备；然后依据X线片及临床检查评价根管预备效果。结果：A组83个钙化闭塞根管中有72个根管扩通，预备完好，成功率为86.75%。B组82个钙化闭塞根管中仅有18个根管扩通，成功率为21.95%，且断针率增加，比较差异有统计学意义（P〈0.01）。结论：EDTA糊剂用于钙化闭塞根管预备效果好，可显著提高根管预备成功率。

EDTA Application Research in the Calcified Block Root Canal Preparation of the Back Teeth

Objective：The calcified block root canals have greatly influenced the curative effect to the root canals.To observe the EDTA paste in the application of calcified block root canal preparation,evaluate its clinical efficacy.Method：One hundred and twenty-four patients in our department from March 2009 to March 2012 were selected,140 back molar teeth,165 calcified block root canals and then divide them randomly into the group A and the group B,62 cases in each group.There were 62 cases,68 back molar teeth and 83 calcified block root canals in the group A.The group A was treated with the EDTA paste into root canal occlusion for root canal preparation,or temporary seal root canal EDTA root canal preparation a week later.There were 62 cases,72 back molar teeth and 82 calcified block root canals in the group B.The group B was treated with chloramine into the calcified block root canals and then had a root canal preparation.The preparatory effect of the root canals according to the X-ray and clinical examination were evaluated. Result：Eighty-three calcified block root canal in the group A with 72 root canal expansion,prepared well,the success rate was 86.75%.82 calcified block root canal in the group B only 18 root canal in root canal expansion,the success rate was 21.95%,and the breakage rate increased,the difference was statistically significant（P〈0.01）.Conclusion：The effect that EDTA paste has been used in the calcified block root canals is very good.It can raise remarkably the successful rate of root canal preparation.