使用四种镍钛机械锉进行根管预备后牙本质微裂缝的形成。

Zi Wang, Ming Xue
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引用次数: 0

摘要

研究目的本研究旨在通过显微计算机断层扫描(micro-CT)分析,比较T-Flex、Reciproc Blue (RB)、ProTaper Gold (PTG)和ProTaper Universal (PTU)等四种机械镍钛锉在体外根管预备后牙本质微裂纹生成方面的差异:选取 32 颗新鲜拔出的角度不超过 10° 的双根管前磨牙作为体外根管预备模型。然后,根据根管预备所使用的不同镍钛系统,将标本随机分配到四个实验组(n=8):T-Flex 组、RB 组、PTG 组和 PTU 组。显微 CT 的体素大小设定为 17.18 μm。扫描并分析牙根术前和术后的横截面图像(n=56 940),以确定是否存在牙本质微裂缝。各组的结果用存在微裂纹的断面图像的数量和百分比表示。采用 McNemar 检验来确定牙本质微裂缝在器械治疗前后是否存在显著差异。显著性水平设定为 PResults:总体而言,11.04% 的图像显示牙本质缺损(n=6 288)。在 T-Flex、RB、PTG 和 PTU 组中,分别有 9.82%、10.79%、12.27% 和 11.25%的器械治疗后图像出现牙本质微裂缝。然而,所有这些牙本质微裂纹在相应的术前图像中都已经存在。使用上述系统进行根管预备后,前磨牙没有产生新的微裂纹:结论:拔牙的牙本质微裂纹在根管预备前已经存在。使用 T-Flex、RB、PTG 和 PTU 系统进行根管预备不会导致前磨牙直根管内形成新的牙本质微裂缝。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Formation of dentinal microcracks after root canal preparation with four kinds of mechanical nickel-titanium files.

Objectives: This study aimed to compare the differences among four kinds of mechanical Ni-Ti files including T-Flex, Reciproc Blue (RB), ProTaper Gold (PTG), and ProTaper Universal (PTU) in dentinal microcrack generation after root canal preparation in vitro by using micro-computed tomography (micro-CT) analysis.

Methods: A total of 32 freshly extracted double-root-canal premolars with an angle not exceeding 10° were selected and established as root canal preparation models in vitro. Then, the specimens were randomly assigned to four experimental groups (n=8) according to the different Ni-Ti systems used for root canal preparation: group T-Flex, group RB, group PTG, and group PTU. The voxel size of the micro-CT was set at 17.18 μm. Pre- and post-operative cross-sectional images of roots (n=56 940) were scanned and analyzed to identify the presence of dentinal microcracks. The results of each group were expressed by the quantity and percentage of sectional images with microcracks. McNemar test was used to determine whether a significant difference existed in the existence of dentinal microcracks before and after instrumentation. The level of significance was set at P<0.05.

Results: Overall, 11.04% of the images presented dentinal defects (n=6 288). Dentinal microcracks were observed in 9.82%, 10.79%, 12.27%, and 11.25% of the post-instrumentation images from groups T-Flex, RB, PTG, and PTU, respectively. However, all these dentinal microcracks were already present in the corresponding pre-operative images. No new microcrack of premolars were generated after the root canal preparation utilizing the aforementioned systems.

Conclusions: Denti-nal microcracks already existed in advance in extracted teeth before root canal preparation. Root canal preparation using the T-Flex, RB, PTG, and PTU systems did not induce the formation of new dentinal microcracks on the straight root canals of premolars.

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