Abstract:

Objective    To analyze the impact of a retained Ni-Tiinstrument on outcome of root canal treatment. Methods    Forty teeth were collected at Nanjing Stomatology Hospital from January 2011 to March 2013. Information included tooth type，the length of separated fragments，the location of the fragments in root canal，the preoperative diagnosis and the outcome of these cases were collected. Results    Overall，weighted mean healing for the teeth with a retained instrument fragment was 80.0%.  Healing rate was 71.4% for the teeth suffering from apical inflammation before treatment and 84.6% for pulpitis. Conclusion    The outcome of endodontic treatment when a separated fragment is left within root canal is not significantly reduced.

Key words: NiTi instrument, instrument separation, outcome

摘要：

目的    评估根管内留存的镍钛器械分离片段对根管治疗预后的影响。方法    选取2011年1月至2013年3月南京大学医学院附属口腔医院牙体牙髓病科进行根管治疗发生镍钛器械分离且未取出患者40例，分析器械分离牙位、分离片段长度、分离片段位置、患牙临床诊断对根管治疗预后的影响。结果    根管治愈率为80.0%，器械分离发生牙位与根管治疗预后无明显关系。牙髓炎组治愈率为84.6%，根尖周炎组治愈率为71.4%，差异无统计学意义（P＞0.05）。结论    根管内留存镍钛器械分离片段对根管治疗预后无明显影响。

关键词: 镍钛器械, 器械分离, 预后