Postgraduate Program in Endodontics, Department of Endodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19103, USA.
J Endod. 2010 Feb;36(2):302-4. doi: 10.1016/j.joen.2009.10.021. Epub 2009 Dec 10.
Profile GT files have been redesigned and are now marketed as GTX nickel-titanium rotary files.
A double-digital radiographic technique was used to compare apical transportation (AT) and change in working length (CWL) between Profile GT and GTX rotary files. Mesiobuccal canals of 40 extracted mandibular molars were instrumented by either rotary system. The central axes of preoperative (15 K) and master apical rotary file (30/.04) were digitally superimposed. AutoCAD was used to measure AT at 0, 1, and 3 mm from WL. The distance from the file tip to the set WL indicated any CWL. Analysis of variance test showed no significant differences between groups in AT.
CWL in GTX (-0.25 +/- 0.42) group was significantly greater than in Profile GT group (0.17 +/- 0.30).
The AT results indicate that the newly designed GTX rotary instruments are as effective as the older Profile GT instruments.
Profile GT 文件已重新设计，现作为 GTX 镍钛旋转锉上市销售。
采用双重数字射线照相技术比较 Profile GT 和 GTX 旋转锉的根尖运输（AT）和工作长度变化（CWL）。40 颗下颌磨牙的颊舌向根管分别用两种旋转系统进行预备。将术前（15 K）和主尖旋转锉（30/.04）的中心线进行数字叠加。AutoCAD 用于测量从 WL 0、1 和 3mm 处的 AT。从锉刀尖到设定 WL 的距离表示任何 CWL。方差分析显示两组之间 AT 无显著差异。
GTX（-0.25 +/- 0.42）组的 CWL 明显大于 Profile GT 组（0.17 +/- 0.30）。
新设计的 GTX 旋转器械的 AT 结果表明与较旧的 Profile GT 器械一样有效。
