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3
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Changes in centring and shaping ability using three nickel–titanium instrumentation techniques analysed by micro-computed tomography (μCT).使用微计算机断层扫描（μCT）分析三种镍钛器械技术的中心定位和成型能力的变化。
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Cyclic fatigue of Reciproc and WaveOne reciprocating instruments.往复运动镍钛器械 Reciproc 和 WaveOne 的疲劳寿命。
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Root canal anatomy preservation of WaveOne reciprocating files with or without glide path.使用或不使用预弯导丝的 WaveOne 往复式锉根管解剖结构保存效果。
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定位与输送：弯曲根管中连续和往复系统的体外评估

Centering and transportation: in vitro evaluation of continuous and reciprocating systems in curved root canals.

作者信息

Navós Beatriz Vilas, Hoppe Carolina Bender, Mestieri Leticia Boldrin, Böttcher Daiana Elizabeth, Só Marcus Vinicius Reis, Grecca Fabiana Soares

机构信息

Department of Endodontics, School of Dentistry, University of Republic, Montevideo, Uruguay.

Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.

出版信息

J Conserv Dent. 2016 Sep-Oct;19(5):478-81. doi: 10.4103/0972-0707.190008.

DOI:10.4103/0972-0707.190008
PMID:27656071
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5026112/
Abstract

CONTEXT

One of the goals of endodontic therapy is the shaping and cleaning of the root canal system. In recent years, there has been multiple systems instrumentation, and changes in their dynamics are central to maintain the original shape of the canal after preparation.

AIMS

The aim of this study was to evaluate centering and transportation in curved root canals after using ProTaper(®) and MTwo(®) in continuous rotation, Reciproc(®) in reciprocating motion, and a step-down manual instrumentation technique.

SETTINGS AND DESIGN

Mesiobuccal roots of human extracted the first and second maxillary molars were selected and the canals (n = 60) were divided into four groups according to the preparation techniques: PT-ProTaper(®); MT-MTwo(®); RE-Reciproc(®); MI-manual instrumentation.

SUBJECTS AND METHODS

The final apical diameter was standardized to a size 25. Centering and transportation were evaluated by cone-beam computed tomography and Adobe Photoshop 8.0 software.

STATISTICAL ANALYSIS USED

The data were statistically analyzed by ANOVA and Tukey post hoc.

RESULTS

Results of transportation showed no statistical differences (P > 0.05) between groups, and significantly, difference (P < 0.05) between ProTaper(®) and Reciproc(®) was found when evaluating centering ability in the apical third.

CONCLUSIONS

We concluded that there were no differences in transportation between the evaluated systems for the preparation of curved root canals with an apical instrumentation diameter of #25. For centering ability, in the apical third, ProTaper(®) presented worst behavior when compared to Reciproc(®).

摘要

背景

牙髓治疗的目标之一是根管系统的成形和清理。近年来，出现了多种根管预备系统，而其动力学变化对于预备后维持根管的原始形态至关重要。

目的

本研究的目的是评估在连续旋转使用ProTaper(®)和MTwo(®)、往复运动使用Reciproc(®)以及逐步后退手动预备技术后，弯曲根管中的定心和根管偏移情况。

设置与设计

选取人类拔除的上颌第一和第二磨牙的近中颊根，将根管（n = 60）根据预备技术分为四组：PT-ProTaper(®)；MT-MTwo(®)；RE-Reciproc(®)；MI-手动预备。

研究对象与方法

最终根尖直径标准化为25号。通过锥形束计算机断层扫描和Adobe Photoshop 8.0软件评估定心和根管偏移情况。

统计分析方法

数据采用方差分析和Tukey事后检验进行统计学分析。

结果

根管偏移结果显示各组间无统计学差异（P > 0.05），而在评估根尖三分之一处的定心能力时，ProTaper(®)和Reciproc(®)之间存在显著差异（P < 0.05）。

结论

我们得出结论，对于根尖预备直径为#25的弯曲根管预备，所评估的系统在根管偏移方面无差异。在定心能力方面，在根尖三分之一处，与Reciproc(®)相比，ProTaper(®)表现最差。