The aim of this study was to compare shaping abilities of Protaper Gold® (PTG) and 2Shape® (TS) by using a new automatic process and micro‐computed tomography (Micro‐CT). 32 first mandibular molars with two separate mesial canals were selected. Only mesial roots were prepared with PTG and TS. Pre‐ and post‐operative scans were performed using Micro‐CT to provide volumes with a voxel size of 20 μm. Volumes, non‐instrumented area, amount of transportation and centering ability in coronal, middle and apical third shaping time and procedural errors were recorded. TS and PTG increased the endodontic volume of 2.98 mm³ (±1.56) and 3.21 mm³ (±1.78) respectively with no statistical difference (p = .168) and no procedural errors. No significant difference was found concerning canal transportation among groups but only within the same group PTG (p value < .001) and TS (p value < .001). The mean centering ratio was significantly different only between the section levels for PTG (p value < .001) and TS (p value = .01); it was significantly reduced in the cervical third. The percentage of untouched canal walls ranged between 29.78% (±15.145) and 36.60% (±11.968) respectively for PTG and TS with no statistical difference among groups (p value = .168). TS and PTG with post machining heat treatment were able to produce centered preparations with no significant difference or procedural errors. TS system provided a shorter preparation time than PTG files.

中文翻译：

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下颌磨牙近中根管中 2Shape 和 ProTaper 金的根管运输评估：一项显微计算机断层扫描研究

本研究的目的是通过使用新的自动过程和微计算机断层扫描 (Micro-CT) 来比较 Protaper Gold® (PTG) 和 2Shape® (TS) 的成型能力。选择了具有两个独立近中管的 32 颗第一下颌磨牙。仅用 PTG 和 TS 制备近中根。使用 Micro-CT 进行术前和术后扫描，以提供体素大小为 20 μm 的体积。记录体积、非器械区、冠状、中、尖第三次成形时间和程序错误的运输量和定心能力。TS 和 PTG 分别增加了 2.98 mm ³ (±1.56) 和 3.21 mm ³ (±1.78)的牙髓体积，无统​​计学差异（p= .168）并且没有程序错误。组间运河运输没有发现显着差异，但仅在同一组 PTG ( p值 < .001) 和 TS ( p值 < .001) 内。平均居中比仅在 PTG（p值 < .001）和 TS（p值 = .01）的截面水平之间显着不同；它在宫颈三分之一处显着减少。PTG和TS未触及的根管壁百分比分别在29.78%（±15.145）和36.60%（±11.968）之间，组间无统计学差异（p值 = .168）。采用后加工热处理的 TS 和 PTG 能够生产居中准备，没有显着差异或程序错误。TS 系统提供比 PTG 文件更短的准备时间。