D'Amario Maurizio, Baldi Mario, Petricca Roberto, De Angelis Francesco, El Abed Rashid, D'Arcangelo Camillo
Unit of Restorative Dentistry and Endodontics, Department of Life, Health and Environmental Sciences, Dental Clinic, University of L'Aquila, L'Aquila, Italy.
J Endod. 2013 Dec;39(12):1581-4. doi: 10.1016/j.joen.2013.06.037. Epub 2013 Oct 13.
Nickel-titanium rotary instruments recently have been introduced with the purpose of creating an initial glide path. The purpose of this study was to compare the maintenance of canal anatomy, the occurrence of apical transportation, and the working time observed using mechanised instrumentation with the new G-File rotary system (Micro-Mega, Besançon Cedex, France) with those observed using instrumentation with the PathFile system (Dentsply Maillefer, Ballaigues, Switzerland) and manual instrumentation with K-type files (Micro-Mega) to create a glide path in curved root canals.
The mesial canals of 45 mandibular molars (with curvature angles between 25° and 35°) were selected. The specimens were randomly divided into 3 groups with 15 canals each, and canal preparations were performed by an endodontist using #12-17 G-File rotary instruments (group GF), #13-16-19 PathFile rotary instruments (group PF), and #10-15-20 K-type stainless steel manual files (group M). A digital double radiographic technique was used to determine apical transportation and the change in the angle of curvature. The working time was also calculated.
No statistically significant differences in the angle of canal curvature and apical transportation were found between the groups. However, concerning the working time, specimens from the group who underwent canal preparation using #12-17 G-File rotary instruments achieved significantly lower mean values when compared with the other 2 groups, whereas the group who underwent canal preparation using the #10-15-20 K-type stainless steel manual files had the highest values.
The G-File rotary instruments, the PathFile system, and the manual instruments did not have any influence on the occurrence of apical transportation nor did they produce a change in the angle of canal curvature. The G-File instruments seemed to be the most rapid system in creating a safe glide path.
最近引入了镍钛旋转器械，目的是建立初始的滑行通道。本研究的目的是比较使用新型G-File旋转系统（法国贝桑松塞德克斯市的Micro-Mega公司）进行机械预备、PathFile系统（瑞士巴拉格市的登士柏迈丽菲公司）预备以及使用K型锉（Micro-Mega公司）手动预备在弯曲根管中建立滑行通道时，根管解剖结构的保持情况、根尖偏移的发生率和操作时间。
选择45颗下颌磨牙的近中根管（弯曲角度在25°至35°之间）。将标本随机分为3组，每组15个根管，由一名牙髓病医生分别使用#12 - 17 G-File旋转器械（GF组）、#13 - 16 - 19 PathFile旋转器械（PF组）和#10 - 15 - 20 K型不锈钢手动锉（M组）进行根管预备。采用数字双X线摄影技术确定根尖偏移和弯曲角度的变化，并计算操作时间。
各组之间在根管弯曲角度和根尖偏移方面未发现统计学上的显著差异。然而，在操作时间方面，与其他两组相比，使用#12 - 17 G-File旋转器械器械进行根管预备的组的标本平均操作时间显著更低，而使用#10 - 15 - 20 K型不锈钢手动锉进行根管预备的组操作时间最长。
G-File旋转器械、PathFile系统和手动器械对根尖偏移的发生均无影响，也未引起根管弯曲角度的改变。G-File器械似乎是建立安全滑行通道最快的系统。
