Talati Ali, Moradi Saeed, Forghani Maryam, Monajemzadeh Ali
Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Iran Endod J. 2013 Spring;8(2):55-8. Epub 2013 May 1.
Disinfection and subsequent obturation of the root canal space require adequate mechanical enlargement of the canals. The purpose of this in vitro study was to compare the shaping ability of Mtwo, RaCe and Medin rotary instruments during the preparation of curved root canals.
Sixty mesiobuccal root canals of mandibular molars with severe curvatures between 25-35(°) and radius of 4-9 mm were randomly divided into three groups of 20 canals each. Using pre- and post-instrumentation radiographs, straightening of the canal and the apical transportation were determined with AutoCAD software. The data were analyzed using Chi square, analysis of variance, and post-hoc tests and the significance level was set at P<0.05.
Mtwo instruments maintained the canal curvature significantly better than Race and Medin instruments (P<0.05). There was significant difference between the rotary instruments for iatrogenic transportation of the major foramen (P>0.05).
Under the conditions of this in vitro study, Mtwo instruments seemed superior to the two other rotary instruments.
根管空间的消毒及后续充填需要对根管进行充分的机械预备。本体外研究的目的是比较Mtwo、RaCe和Medin旋转器械在弯曲根管预备过程中的塑形能力。
选取60个下颌磨牙近中颊根根管，根管严重弯曲，弯曲度在25-35°之间，半径为4-9mm，随机分为三组，每组20个根管。使用器械预备前后的X线片，通过AutoCAD软件确定根管的直线化程度和根尖移位情况。数据采用卡方检验、方差分析和事后检验进行分析，显著性水平设定为P<0.05。
Mtwo器械保持根管弯曲度明显优于Race和Medin器械（P<0.05）。在主要根尖孔的医源性移位方面，旋转器械之间存在显著差异（P>0.05）。
在本体外研究条件下，Mtwo器械似乎优于其他两种旋转器械。
