Characterization of the nucleus, cutting edge and failure detection in NiTi instruments for endodontic retreatment

Q4 Dentistry

Revista Odonto Ciencia Pub Date : 2018-07-25 DOI:10.15448/1980-6523.2017.4.30157

D. Decurcio, J. A. Silvaa, Mateus Gehrke Barbosa, L. S. Chaves, M. Loureiro, C. Estrela

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引用次数: 0

Abstract

OBJECTIVE: To characterize the nucleus, cutting edge and to detect defects in surfaces of nickeltitanium (NiTi) instruments for endodontic retreatment.METHODS: The selected endodontic instruments (D-RaCe, ProTaper retreatment and Mtwo retreatment) were evaluated prior to their use in 30- and 50-fold magnification in scanning electron microscopy (SEM), for linear measurements of lateral cut edge areas and of the nucleus and the ratio between these measures. After use in simulated canals, faults in the active surface were analyzed by SEM with 30 and 50 times magnification, and 200 times magnification when faults were found. The images were examined by three evaluators, whose measurements were previously calibrated. The defects analyzed were crack, blunt and barb, and data were tabulated for analysis.RESULTS: The instruments studied differed in results. The D-RaCe system instruments had the highest nucleus:edge ratio, while ProTaper retreatment instruments yielded the lowest ratio. All instruments presented some defect, with the instruments Mtwo retreatment presenting two instruments with defects.CONCLUSION: All analyzed instruments presented some type of failure after using them for removal of the filling material of simulated root canals. The D-RaCe system presented the highest edge measurements and the smallest nucleus measurements, contrary to the ProTaper retreatment system, which presented the smallest edge measurements and the largest core measurements.

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用于根管再治疗的NiTi器械的核、尖端和故障检测的表征

目的：对镍钛（NiTi）根管再治疗器械的髓核、切削刃进行表征，并检测其表面缺陷。方法：在扫描电子显微镜（SEM）中以30倍和50倍的放大倍数对所选的牙髓器械（D-RaCe、ProTaper再处理和Mtwo再处理）进行使用前评估，以线性测量侧切边缘区域和髓核以及这些测量之间的比率。在模拟运河中使用后，通过SEM以30倍和50倍的放大率分析活动表面的断层，当发现断层时放大200倍。三名评估人员对图像进行了检查，他们的测量值已预先校准。分析的缺陷包括裂纹、钝性和倒钩，并将数据制成表格进行分析。结果：所研究的仪器结果不同。D-RaCe系统器械具有最高的核：边缘比率，而ProTaper再处理器械产生的比率最低。所有仪器都存在一些缺陷，其中Mtwo再处理的仪器有两个存在缺陷。结论：所有分析仪器在使用它们去除模拟根管填充材料后都出现了某种类型的故障。D-RaCe系统提供了最高的边缘测量值和最小的核心测量值，而ProTaper再处理系统提供了最小的边缘测量结果和最大的核心测量结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Odonto Ciencia Dentistry-Dentistry (all)

CiteScore

0.30

自引率

0.00%

发文量

期刊介绍： Cessation. The Revista Odonto Ciência is a peer-reviewed journal published online (ISSN 1980-6523), four times per year, supported by the Pontifical Catholic University of Rio Grande do Sul – Dental School since 1986. Its abbreviation is Rev Odonto Cienc, which should be used in references, bibliographic legends, and footnotes. The Revista Odonto Ciência is an international scientific journal dedicated to provide a forum for academics, researchers, and practitioners to communicate relevant basic, clinical, education, and epidemiological studies in Dentistry and related fields. The Journal seeks to publish articles on new conceptual models, innovative technology, alternative procedures or treatment to reduce disease burden in the general population or specific groups, thus contributing to translating science into practice and social development. Contributions falling into the following categories will be considered for publication: 1) original research reports of basic and applied oral sciences, epidemiological, and education studies; 2) review article; 3) case report. The Revista Odonto Ciência only accepts manuscripts written in English. Manuscripts submitted to this journal should not have been published before nor have publication pending elsewhere.