The Ability of Different Nickel-Titanium Rotary Instruments To Induce Dentinal Damage During Canal Preparation

Bier, Carlos Alexandre Souza; Shemesh, Hagay; Tanomaru-Filho, Mário; Wesselink, Paul R.; Wu, Min-Kai

doi:10.1016/j.joen.2008.10.021

Cited by 296 publications

(375 citation statements)

References 16 publications

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“…However, the micro-CT technology provides the possibility to examine the dentinal tissue before the root canal preparation, which is indeed a very suitable and important feature. The absence of new dentinal defects found after canal preparation with PTU system in the current study markedly contrasts with the results of previous studies, which showed that rotary canal preparation with this system could initiate and/or propagate dentinal micro-cracks (3,4,6,8,9,22). Bier and colleagues (4) observed cracks in 16% of horizontal sections of the roots instrumented with PTU system.…”

Section: Dentinal Defects and Root Canal Preparationcontrasting

confidence: 99%

“…This methodology exempts the need of cutting the specimens and allows comparison of the same sample before and after instrumentation. These are the most important methodological differences regarding previous studies (4,6,8,9). The reliability of this technology to detect dentinal defects was confirmed herein, once the full extension of dentinal micro-cracks visualized under conventional stereomicroscopy was identified in the micro-CT crosssectional images.…”

Section: Discussionsupporting

confidence: 59%

“…The total sample size for this study was calculated after an effect size estimation of dentinal defects promoted by the PTU system, as reported previously (4). From 50 samples, the authors reported the presence of dentinal defects in 8 roots.…”

Section: Sample Size Calculationmentioning

confidence: 99%

“…Published studies on this topic always embrace cutting procedures and postoperative observation through optical microscopy technique. Under this methodological approach, it has been stated that NiTi rotary preparation per se might have an etiological role in the creation of dentinal defects (4)(5)(6)(7)(8)(9). Although these studies seem experimentally sound at first sight, as most of control groups using non-prepared teeth showed, in most cases, no dentinal defects, the destructive approach of the method stands for its major drawback, since the preoperative condition of the dentin is unknown.…”

Section: Introductionmentioning

confidence: 99%

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On the Causality Between Dentinal Defects and Root Canal Preparation: A Micro-CT Assessment

et al. 2016

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This study aimed to evaluate the cause-effect relationship between canal preparation with ProTaper Universal (PTU) system and dentinal defects formation using micro-computed tomography (micro-CT) analysis. Forty mesial canals of mandibular molars with a type II Vertucci's canal configuration were scanned at an isotropic resolution of 14.16 µm. The sample was assigned to an experimental (n = 30) and a control (n = 10) groups, and the mesial canals were prepared with PTU system up to F2 instrument. The specimens from the experimental group were scanned and the cross-section images of the mesial roots, before and after preparation, were screened to identify the presence of dentinal defects. In the control group, the specimens were sectioned perpendicularly to the long axis of the root into 1-mm-thick slices (n = 80) and examined under optical microscope. Once a dentinal defect was detected, the slice was scanned through micro-CT. In the experimental group, dentinal micro-cracks were observed in 4,828 slices (24.04%). In all cross-section images, dentinal defects identified in the postoperative images were already present in the corresponding preoperative image. In the control group, 13 out of 80 slices (16.25%) had at least one dentinal defect visualized under stereomicroscopy, which was identified after a further micro-CT scanning. Micro-CT showed reliability as similar as optical microscopy in detecting dentinal defects, adding the possibility of tracking the dentinal tissue, before and after canal preparation, and providing a clear visualization of micro-cracks. Root canal preparation with PTU system did not induce the formation of new dentinal defects.

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Section: Dentinal Defects and Root Canal Preparationcontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 59%

Section: Sample Size Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Causality Between Dentinal Defects and Root Canal Preparation: A Micro-CT Assessment

et al. 2016

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“…In the last decades, the emergence of NiTi rotary instrumentation has transfigured the root canal treatment by reducing the operator fatigue, time required to complete the preparation and minimized the procedural errors as compared with hand instrumentation [4]. However, rotary files with large tapers may cause significantly more complete and incomplete dentinal cracks [5].…”

Section: Introductionmentioning

confidence: 99%