Arias Ana, Singh Rupinderpal, Peters Ove A
Department of Endodontics, Arthur A. Dugoni School of Dentistry, University of the Pacific, San Francisco, California.
Department of Endodontics, Arthur A. Dugoni School of Dentistry, University of the Pacific, San Francisco, California.
J Endod. 2014 Jul;40(7):973-6. doi: 10.1016/j.joen.2013.11.019. Epub 2014 Jan 8.
The purpose of this study was to compare peak torque and force between ProTaper Universal (PTU) and ProTaper Next (PTN) instruments during the preparation of large and small root canals in extracted teeth.
Twelve maxillary incisors and each independent canal of 6 mesial roots of mandibular molars were randomly assigned to be prepared with a new set of either PTU or PTN instruments after a glide path was achieved. A total of 12 new sets of each instrument system were used. The tests were run in a standardized fashion in a torque-testing platform. Peak torques (Ncm) and force (N) were registered; analysis of variance and Tukey post hoc tests were then applied.
Among instruments in the same sequence, no significant differences in peak torque and force were found among PTN instruments when shaping small or large root canals, but some PTU instruments showed statistically lower peak torque and force (P < .01) than others for both types of canals. Whereas PTU instruments showed significant differences in peak torque and force (P < .05) between large and small root canals, PTN instruments showed significantly lower force (P < .04) in large canals, but peak torque was not significantly different for upper central incisors or mesial mandibular root canals.
Under the conditions of this study, instruments in ProTaper Next set showed greater regularity in peak torque for small and large canals than ProTaper Universal instruments.
本研究的目的是比较在拔除牙齿中预备大、小根管时，ProTaper通用型（PTU）器械和ProTaper Next（PTN）器械之间的峰值扭矩和力量。
在建立引导通路后，将12颗上颌切牙以及6颗下颌磨牙近中根的每个独立根管随机分配，分别用一组新的PTU或PTN器械进行预备。每种器械系统共使用12组新器械。测试在扭矩测试平台上以标准化方式进行。记录峰值扭矩（Ncm）和力量（N）；然后应用方差分析和Tukey事后检验。
在相同顺序的器械中，PTN器械在预备小或大根管时，峰值扭矩和力量无显著差异，但对于两种类型的根管，一些PTU器械的峰值扭矩和力量在统计学上低于其他器械（P <.01）。PTU器械在大、小根管之间的峰值扭矩和力量有显著差异（P <.05），而PTN器械在大根管中的力量显著较低（P <.04），但在上颌中切牙或下颌近中根管中，峰值扭矩无显著差异。
在本研究条件下，ProTaper Next套装器械在预备大、小根管时，峰值扭矩比ProTaper通用型器械更具规律性。
