Gergi Richard, Abou Rjeily Joe, Osta Nada, Sader Joseph, Naaman Alfred
Department of Endodontics, Faculty of Dentistry, Saint-Joseph University, P.O. Box 166255, Beirut, Lebanon.
Int J Dent. 2012;2012:265695. doi: 10.1155/2012/265695. Epub 2012 Feb 29.
Introduction. The purpose of this study was to compare the taper variation in root canal preparations among Twisted Files and PathFiles-ProTaper .08 tapered rotary files to current standards. Methods. 60 root canals with severe angle of curvature (between 25° and 35°) and short radius (r < 10 mm) were selected. The canals were divided randomly into two groups of 30 each. After preparation with Twisted Files and PathFiles-ProTaper to size 25 taper .08, the diameter was measured using computed tomography (CT) at 1, 3, and 16 mm. Canal taper preparation was calculated at the apical third and at the middle-cervical third. Results. Of the 2 file systems, both fell within the ±.05 taper variability. All preparations demonstrated variability when compared to the nominal taper .08. In the apical third, mean taper was significantly different between TF and PathFiles-ProTaper (P value < 0.0001; independent t-test). Mean Taper was significantly higher with PathFile-ProTaper. In the middle-cervical third, mean Taper was significantly higher with TF (P value = 0.015; independent t-test). Conclusion. Taper preparations of the investigated size 25 taper .08 were favorable but different from the nominal taper.
引言。本研究的目的是将Twisted Files和PathFiles-ProTaper.08锥度旋转锉的根管预备锥度变化与现行标准进行比较。方法。选取60个严重弯曲角度（25°至35°之间）且短半径（r < 10毫米）的根管。将根管随机分为两组，每组30个。用Twisted Files和PathFiles-ProTaper预备至25号.08锥度后，使用计算机断层扫描（CT）在1、3和16毫米处测量直径。计算根尖三分之一处和中颈三分之一处的根管锥度预备情况。结果。在这两种锉系统中，两者的锥度变化均在±.05范围内。与标称锥度.08相比，所有预备均显示出变化。在根尖三分之一处，TF和PathFiles-ProTaper之间的平均锥度有显著差异（P值 < 0.0001；独立t检验）。PathFile-ProTaper的平均锥度显著更高。在中颈三分之一处，TF的平均锥度显著更高（P值 = 0.015；独立t检验）。结论。所研究的25号.08锥度的锥度预备是良好的，但与标称锥度不同。
