Abstract:

Abstract：Objective To evaluate the clinical effect of Mtwo rotary nickel-titanium （NiTi）instruments on root canal therapy of primary molars. Methods Eighty teeth with acute or chronic pulpitis（Group P）and 80 teeth with acute or chronic apical periodontitis（Group A）of 103 patients aged 4 ~ 8 years were collected. Group P and A were randomly divided into experimental group（E）and control group（C） respectively．Mtwo rotary NiTi instruments were used in experimental groups，while modified step-back technique with Gates-Glidden drills were used in control groups. The operation time and the rate of endodontic interappointment pain were observed. Results The average time（sec）for root canal preparation in groups PE and PC were（308.5 ± 60.4）and（492.0 ± 48.5）s（P < 0.05），the interappointment pain rates were 5.0% and 2.5%（P > 0.05）respectively. The average time for root canal preparation in groups AE and AC were（379.8 ± 61.3）and（593.8 ± 79.7）s（P < 0.05）；the interappointment pain rates were 7.5% and 20.0%（P > 0.05）respectively. Conclusion Mtwo rotary NiTi instrument is efficient and comfortable for root canal preparation of primary molars.

Key words: Mtwo rotary NiTi instrument, root canal therapy, primary molar, endodontic interappointment pain

摘要：

目的 评价Mtwo机用镍钛器械用于乳磨牙根管治疗的临床效果。方法 选择2013年1—12月南京大学医学院附属口腔医院儿童口腔科门诊就诊的103名4～8岁患儿，应用两种不同预备方法和器械对160颗乳磨牙行根管治疗。其中80颗诊断为急、慢性牙髓炎（P组），80颗诊断为急、慢性根尖周炎（A组），P、A每组再随机分为试验组（E组）和对照组（C组），每组40颗，试验组用Mtwo机用镍钛器械预备根管，对照组用GG钻和不锈钢K锉以改良步退法预备根管。根据操作时间、约诊间痛发生率评价临床效果。结果 PE组与PC组根管预备平均时间分别为（308.5 ± 60.4）和（492.0 ± 48.5）s（P < 0.05）；约诊间痛发生率分别为5.0%和2.5%（P > 0.05）。AE组与AC组根管预备平均时间分别为（379.8 ± 61.3）和（593.8 ± 79.7）s（P < 0.05）；约诊间痛发生率分别为7.5%和20.0%（P > 0.05）。结论 Mtwo机用镍钛根管预备器械能够提高乳磨牙根管治疗的效率和效果。

关键词: Mtwo机用镍钛器械, 根管治疗, 乳磨牙, 约诊间痛