Shivashankar Mayuri Biccodu, Niranjan Nandini Thippannanavar, Jayasheel Arun, Kenchanagoudra Mallikarjun Goud
Senior Dental Health Officer, Government Hospital , Tumukur, Karnataka, India .
Reader, Department of Conservative Dentistry and Endodontics, Bapuji Dental College and Hospital , Davangere, Karnataka, India .
J Clin Diagn Res. 2016 Nov;10(11):ZC10-ZC14. doi: 10.7860/JCDR/2016/20373.8788. Epub 2016 Nov 1.
Complete cleaning and shaping of root canal system is of paramount importance to achieve a successful root canal treatment. There are various rotary Ni-Ti systems available in the market to achieve mechanical goal of root canal preparation. But aggressive preparation of root canal with such systems would result in canal transportation and excess root dentin removal that would be one of the major reasons to decide the prognosis of root canal treated tooth.
The present study was conducted to compare the root canal preparation in terms of canal transportation and volumetric changes in the root canal dentin among three Ni-Ti file systems, namely Mtwo, ProTaper (PT) and ProTaper NEXT (PTN) file system, using Computed Tomography (CT).
A total of 45 mesiobuccal root canals of extracted first molar teeth with completely formed root apices and angle of curvature ranging between 10°- 35° were selected. These teeth were randomly divided into three experimental groups containing 15 teeth each, based on rotary system used. Group-I: Mtwo files, Group-II: PT files and Group-III: PTN files. Pre-instrumentation CT images were obtained at three cross-sectional planes - 3mm, 7mm and 11mm from apical end of the root. Similarly, post-instrumentation images were obtained. Shortest distance from the edge of the canal to the periphery of the root was analyzed by using Analysis of Variance.
All three file systems tested in the present study presented similar behaviour with respect to the root canal transportation. Lesser canal transportation was recorded in Mtwo. But no statistically significant difference was seen in terms of canal transportation and volume of dentin removed between all three rotary systems (p>0.05).
Mtwo, PT and PTN rotary systems have similar behaviour with respect to canal transportation and volume of dentin removed.
根管系统的彻底清理和塑形对于成功进行根管治疗至关重要。市场上有多种旋转镍钛系统可用于实现根管预备的机械目标。但是，使用此类系统积极预备根管会导致根管偏移和过多的根管牙本质去除，这将是决定根管治疗牙齿预后的主要原因之一。
本研究旨在使用计算机断层扫描（CT）比较三种镍钛锉系统，即Mtwo、ProTaper（PT）和ProTaper NEXT（PTN）锉系统在根管偏移和根管牙本质体积变化方面的根管预备情况。
共选择45颗拔除的第一磨牙的近中颊根，根尖完全形成，弯曲角度在10°至35°之间。根据使用的旋转系统，将这些牙齿随机分为三个实验组，每组15颗牙齿。第一组：Mtwo锉；第二组：PT锉；第三组：PTN锉。在距根尖3mm、7mm和11mm的三个横截面上获取预备前的CT图像。同样，获取预备后的图像。使用方差分析分析根管边缘到牙根外周的最短距离。
本研究中测试的所有三种锉系统在根管偏移方面表现出相似的行为。Mtwo记录的根管偏移较小。但是，在所有三种旋转系统之间，在根管偏移和牙本质去除量方面未观察到统计学上的显著差异（p>0.05）。
Mtwo、PT和PTN旋转系统在根管偏移和牙本质去除量方面具有相似的行为。
