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Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study

The purpose of this study was to compare the incidence and longitudinal propagation of dentin defects after gutta-percha removal with hand and rotary instruments using microcomputed tomography. Twenty mandibular incisors were prepared using the balanced-force technique and scanned in a 19.9 μm resol...

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Autores principales: Yilmaz, Ayca, Helvacioglu-Yigit, Dilek, Gur, Cansu, Ersev, Handan, Kiziltas Sendur, Gullu, Avcu, Egemen, Baydemir, Canan, Abbott, Paul Vincent
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5661777/
https://www.ncbi.nlm.nih.gov/pubmed/29109814
http://dx.doi.org/10.1155/2017/4868603
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author Yilmaz, Ayca
Helvacioglu-Yigit, Dilek
Gur, Cansu
Ersev, Handan
Kiziltas Sendur, Gullu
Avcu, Egemen
Baydemir, Canan
Abbott, Paul Vincent
author_facet Yilmaz, Ayca
Helvacioglu-Yigit, Dilek
Gur, Cansu
Ersev, Handan
Kiziltas Sendur, Gullu
Avcu, Egemen
Baydemir, Canan
Abbott, Paul Vincent
author_sort Yilmaz, Ayca
collection PubMed
description The purpose of this study was to compare the incidence and longitudinal propagation of dentin defects after gutta-percha removal with hand and rotary instruments using microcomputed tomography. Twenty mandibular incisors were prepared using the balanced-force technique and scanned in a 19.9 μm resolution. Following filling with the lateral compaction technique, gutta-percha was removed with ProTaper Universal Retreatment (PTUR) or hand instruments. After rescanning, a total of 24,120 cross-sectional images were analyzed. The numbers, types, and longitudinal length changes of defects were recorded. Defects were observed in 36.90% of the cross sections. A total of 73 defects were comprised of 87.67% craze lines, 2.73% partial cracks, and 9.58% fractures. No significant difference in terms of new defect formation was detected between the retreatment groups. The apical and middle portions of the roots had more dentin defects than the coronal portions. Defects in three roots of the PTUR instrument group increased in length. Under the conditions of this in vitro study, gutta-percha removal seemed to not increase the incidence of dentin defect formation, but the longitudinal defect propagation finding suggests possible cumulative dentinal damage due to additional endodontic procedures. Hand and rotary instrumentation techniques caused similar dentin defect formation during root canal retreatment.
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spelling pubmed-56617772017-11-06 Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study Yilmaz, Ayca Helvacioglu-Yigit, Dilek Gur, Cansu Ersev, Handan Kiziltas Sendur, Gullu Avcu, Egemen Baydemir, Canan Abbott, Paul Vincent Scanning Research Article The purpose of this study was to compare the incidence and longitudinal propagation of dentin defects after gutta-percha removal with hand and rotary instruments using microcomputed tomography. Twenty mandibular incisors were prepared using the balanced-force technique and scanned in a 19.9 μm resolution. Following filling with the lateral compaction technique, gutta-percha was removed with ProTaper Universal Retreatment (PTUR) or hand instruments. After rescanning, a total of 24,120 cross-sectional images were analyzed. The numbers, types, and longitudinal length changes of defects were recorded. Defects were observed in 36.90% of the cross sections. A total of 73 defects were comprised of 87.67% craze lines, 2.73% partial cracks, and 9.58% fractures. No significant difference in terms of new defect formation was detected between the retreatment groups. The apical and middle portions of the roots had more dentin defects than the coronal portions. Defects in three roots of the PTUR instrument group increased in length. Under the conditions of this in vitro study, gutta-percha removal seemed to not increase the incidence of dentin defect formation, but the longitudinal defect propagation finding suggests possible cumulative dentinal damage due to additional endodontic procedures. Hand and rotary instrumentation techniques caused similar dentin defect formation during root canal retreatment. Hindawi 2017-05-24 /pmc/articles/PMC5661777/ /pubmed/29109814 http://dx.doi.org/10.1155/2017/4868603 Text en Copyright © 2017 Ayca Yilmaz et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Yilmaz, Ayca
Helvacioglu-Yigit, Dilek
Gur, Cansu
Ersev, Handan
Kiziltas Sendur, Gullu
Avcu, Egemen
Baydemir, Canan
Abbott, Paul Vincent
Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study
title Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study
title_full Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study
title_fullStr Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study
title_full_unstemmed Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study
title_short Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study
title_sort evaluation of dentin defect formation during retreatment with hand and rotary instruments: a micro-ct study
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5661777/
https://www.ncbi.nlm.nih.gov/pubmed/29109814
http://dx.doi.org/10.1155/2017/4868603
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