Zuolo Mario Luis, De-Deus Gustavo, Belladonna Felipe Gonçalves, Silva Emmanuel João Nogueira Leal da, Lopes Ricardo Tadeu, Souza Erick Miranda, Versiani Marco Aurélio, Zaia Alexandre Augusto
Department of Restorative Dentistry, Endodontic Division, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil.
Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil.
J Endod. 2017 Apr;43(4):619-622. doi: 10.1016/j.joen.2016.11.013. Epub 2017 Feb 16.
The aim of the present study was to evaluate the percentage frequency of dentinal micro-cracks observed after root canal preparation with TRUShape and Self-Adjusting File (SAF) systems by means of micro-computed tomography imaging analysis. A conventional full-sequence rotary system (BioRace) and a single-file reciprocation system (Reciproc) were used as reference techniques for comparison because of their known assertive cutting efficiency.
Forty anatomically matched mandibular incisors were selected, scanned at a resolution of 14.25 μm, and assigned to 4 experimental groups (n = 10), according to the preparation protocol: TRUShape, SAF, BioRace, and Reciproc systems. After the experimental procedures, the specimens were scanned again, and the registered preoperative and postoperative cross-section images of the roots (n = 70,030) were screened to identify the presence of dentinal micro-cracks.
Overall, dentinal defects were observed in 28,790 cross-section images (41.11%). In the TRUShape, SAF, BioRace, and Reciproc groups, dentinal micro-cracks were visualized in 56.47% (n = 9842), 42.38% (n = 7450), 32.90% (n = 5826), and 32.77% (n = 5672) of the slices, respectively. All dentinal defects observed in the postoperative data sets were already present in the corresponding preoperative images.
None of the preparation systems induced the formation of new dentinal micro-cracks.
本研究的目的是通过显微计算机断层扫描成像分析，评估使用TRUShape和自调式锉（SAF）系统进行根管预备后观察到的牙本质微裂纹的百分比频率。由于传统全序列旋转系统（BioRace）和单锉往复系统（Reciproc）已知的可靠切割效率，将它们用作参考技术进行比较。
选择40颗解剖结构匹配的下颌切牙，以14.25μm的分辨率进行扫描，并根据预备方案分为4个实验组（n = 10）：TRUShape组、SAF组、BioRace组和Reciproc组。实验操作完成后，再次对标本进行扫描，并筛选出已记录的术前和术后牙根横断面图像（n = 70,030），以确定牙本质微裂纹的存在情况。
总体而言，在28,790张横断面图像（41.11%）中观察到牙本质缺陷。在TRUShape组、SAF组、BioRace组和Reciproc组中，分别在56.47%（n = 9842）、42.38%（n = 7450）、32.90%（n = 5826）和32.77%（n = 5672）的切片中观察到牙本质微裂纹。术后数据集中观察到的所有牙本质缺陷在相应的术前图像中就已存在。
没有一种预备系统会诱导形成新的牙本质微裂纹。
