Saberi Eshaghali, Farhad-Mollashahi Narges, Bijari Shima, Daryaeian Mohammad
Department of Endodontics, Oral and Dental Disease Research Center, Dental School, Zahedan University of Medical Sciences, Zahedan, Iran.
Int J Dent. 2018 May 14;2018:4151692. doi: 10.1155/2018/4151692. eCollection 2018.
This study is aimed at evaluating root canal transportation in the mesiobuccal canal of mandibular first molars prepared with One Shape, Reciproc, and M-One nickel titanium (NiTi) single-file rotary systems using cone beam computed tomography (CBCT).
In this ex vivo study, CBCT scans of 45 extracted human mandibular first molars with 20-40° curvature were obtained. The teeth were randomly divided into three groups (=15) for preparation of the mesiobuccal canal with One Shape, Reciproc, and M-One rotary systems according to the manufacturers' instructions. CBCT scans were obtained again after canal preparation. Changes caused by preparation in the coronal, middle, and apical thirds were determined on CBCT scans and analyzed using the Kruskal-Wallis test at ≤ 0.05 level of significance.
No significant difference was noted in the amount of canal transportation among the three groups ( > 0.05). M-One caused greater transportation in the apical third compared with Reciproc and One Shape, and One Shape caused greater transportation in the coronal third compared with other groups, although its magnitude was less than 0.3 mm.
Reciproc, One Shape, and M-One are not significantly different in terms of canal transportation.
本研究旨在使用锥形束计算机断层扫描（CBCT）评估用One Shape、Reciproc和M-One镍钛（NiTi）单根管旋转系统预备下颌第一磨牙近中颊根管时的根管偏移情况。
在这项体外研究中，获取了45颗20 - 40°弯曲度的拔除的人下颌第一磨牙的CBCT扫描图像。根据制造商说明，将牙齿随机分为三组（每组15颗），分别用One Shape、Reciproc和M-One旋转系统预备近中颊根管。根管预备后再次进行CBCT扫描。在CBCT扫描上确定预备在冠部、中部和根尖三分之一处引起的变化，并使用Kruskal-Wallis检验在显著性水平≤0.05下进行分析。
三组之间的根管偏移量无显著差异（P > 0.05）。与Reciproc和One Shape相比，M-One在根尖三分之一处引起的偏移更大；与其他组相比，One Shape在冠部三分之一处引起的偏移更大，尽管其幅度小于0.3毫米。
Reciproc、One Shape和M-One在根管偏移方面无显著差异。
