三种镍钛旋转器械在根尖移位方面的比较。

A comparison of three Ni-Ti rotary instruments in apical transportation.

作者信息

Javaheri Homan Hossein, Javaheri Ghasem Hossein

机构信息

Department of Endodontics, Dental Research Center, Shaheed Beheshti University, Evin, Tehran Iran.

出版信息

J Endod. 2007 Mar;33(3):284-6. doi: 10.1016/j.joen.2006.05.004.

DOI:10.1016/j.joen.2006.05.004

PMID:17320715

Abstract

The purpose of this study was to compare apical transportation and changes in canal curvature of three nickel-titanium (Ni-Ti) rotary instruments: Hero 642, RaCe, and ProTaper. Mesiobuccal canals of 60 maxillary first molars (with angles of curvature between 25 degrees and 35 degrees) were prepared with a torque-control, low-speed engine. Canals were prepared using the crown-down technique to the size of #30. Using a radiographic platform, reproducible preinstrumentation and postinstrumentation radiographs were taken. A computer analysis allowed magnification and superimposition of the images. The central axes of initial and final instruments were radiographically superimposed to measure transportation at 1 mm from WL. Data were analyzed using repeated-measures ANOVA. A statistically significant difference in apical transportation was found in ProTaper group. The results suggest that ProTaper file system be implemented in combination with other less tapered more flexible systems, like RaCe, in preparing curved canals.

摘要

本研究的目的是比较三种镍钛（Ni-Ti）旋转器械：Hero 642、RaCe和ProTaper的根尖移位及根管弯曲度变化。使用扭矩控制的低速发动机对60颗上颌第一磨牙的近中颊根管（弯曲角度在25度至35度之间）进行预备。采用冠向下技术将根管预备至30号。利用射线照相平台拍摄可重复的预备前和预备后的X线片。通过计算机分析实现图像的放大和叠加。将初始和最终器械的中心轴进行射线照相叠加，以测量距工作长度1 mm处的移位情况。使用重复测量方差分析对数据进行分析。结果发现ProTaper组在根尖移位方面存在统计学上的显著差异。结果表明，在预备弯曲根管时，ProTaper锉系统应与其他锥度较小、更具柔韧性的系统（如RaCe）联合使用。