Potential Relationship between Design of Nickel-Titanium Rotary Instruments and Vertical Root Fracture

Kim, Hyeon‐Cheol; Lee, Minho; Yum, Jiwan; Versluis, Antheunis; Lee, Chan-Joo; Kim, Byung-Min

doi:10.1016/j.joen.2010.02.010

Cited by 184 publications

(186 citation statements)

References 39 publications

(41 reference statements)

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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%

“…Bier and colleagues (4) observed cracks in 16% of horizontal sections of the roots instrumented with PTU system. Kim and coauthors (3) reported that the same system generated extreme tensile and compressive stresses in root dentin compared to the ProFile (Dentsply Maillefer) constant tapered rotary system. The authors also speculated that higher root stress concentrations would result in thinner dentinal areas and, consequently, the increasing risk of creating defects.…”

Section: Dentinal Defects and Root Canal Preparationmentioning

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: Dentinal Defects and Root Canal Preparationmentioning

confidence: 99%

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

et al. 2016

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“…43 Farklı döner sistemlerin vertikal kök kırıkları üzerine etkilerinin incelendiği bir çalışmada, ProTaper eğelerinin kök dentin yüzeyinde daha fazla strese yol açtığı ve daha yüksek derecede gerilimlere neden olduğu ortaya konmuştur. 44 Kök kanal preparasyon sistemlerinin mikro çatlak oluşturma üzerine etkisinin incelendiği bir başka çalışmada, ProTaper sisteminin daha yüksek oranda dentin çatlağına neden olduğu belirtilmiştir. 45 Çalışmamızda elde ettiğimiz sonuç bahsedilen çalışma sonuçları ile uyumludur.…”

Section: 27unclassified

Effect of different rotary systems on fracture resistance of post-core reconstructed teeth

Görler¹,

Zan²,

Altunbaş³

et al. 2017

Yeditepe J Dent

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“…It is as yet unclear whether craze lines and incomplete cracks may propagate into complete cracks and fractures after completion of the root canal treatment. In addition, following treatment procedures such as post-space preparation or retreatment are discussed as cofactors for the development of dentinal defects or fractures [1,[23][24][25].…”

Section: Brazilian Research Inmentioning

confidence: 99%

Prevalence of Dentinal Defects after Root Canal Preparations in Molars with Reciproc and WaveOne Systems

Amaral

Santos

Salazar-Silva

et al. 2016

Pesqui. bras. odontopediatria clín. integr.

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Objective: To evaluate the prevalence of dentin defects, including partial and complete cracks and fractures, after root canal preparation in molars with Reciproc and WaveOne reciprocating instruments. Material and Methods: Fifty mandibular first and second molars with mature apices were selected to endodontic in vitro instrumentation. Ten teeth were unprepared and served as the control, and the remaining forty teeth were divided into two groups, being twenty corresponding to each reciprocating system. Reciproc and WaveOne systems were used in a reciprocating working motion, under the same conditions, to prepare the two mesial canals. Roots were then sectioned 2, 4 and 6 mm from the apex, and the cut surface was observed under a microscope using 20-fold magnification and checked for the presence of fractures and incomplete cracks. Results: none of the evaluated groups presented fractures, and the control group showed no incomplete cracks. Overall evaluation showed statistical differences between these two groups and the control group (p=0.017) for the prevalence of incomplete cracks, but no significant differences were obtained between Reciproc and WaveOne groups (p>0.05). Reciproc group presented more incomplete cracks on 4-mm sections compared with the control group on the same section (p=0.0326). Conclusion: Root canal preparation with both reciprocating instruments resulted in incomplete cracks, but not fractures. At the level of 4 mm from the apex of the canals, the Reciproc system produced significantly more incomplete cracks. Considering both systems, WaveOne utilization resulted in lesser structural alterations on dentin considering the middle portion of the roots.

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Potential Relationship between Design of Nickel-Titanium Rotary Instruments and Vertical Root Fracture

Cited by 184 publications

References 39 publications

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

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

Effect of different rotary systems on fracture resistance of post-core reconstructed teeth

Prevalence of Dentinal Defects after Root Canal Preparations in Molars with Reciproc and WaveOne Systems

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