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Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments

OBJECTIVES: To determine the incidence of crack formation and propagation in apical root dentin after retreatment procedures performed using ProTaper Universal Retreatment (PTR), Mtwo-R, ProTaper Next (PTN), and Twisted File Adaptive (TFA) systems. MATERIALS AND METHODS: The study consisted of 120 e...

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Autores principales: Özyürek, Taha, Tek, Vildan, Yılmaz, Koray, Uslu, Gülşah
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Korean Academy of Conservative Dentistry 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5682150/
https://www.ncbi.nlm.nih.gov/pubmed/29142882
http://dx.doi.org/10.5395/rde.2017.42.4.332
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author Özyürek, Taha
Tek, Vildan
Yılmaz, Koray
Uslu, Gülşah
author_facet Özyürek, Taha
Tek, Vildan
Yılmaz, Koray
Uslu, Gülşah
author_sort Özyürek, Taha
collection PubMed
description OBJECTIVES: To determine the incidence of crack formation and propagation in apical root dentin after retreatment procedures performed using ProTaper Universal Retreatment (PTR), Mtwo-R, ProTaper Next (PTN), and Twisted File Adaptive (TFA) systems. MATERIALS AND METHODS: The study consisted of 120 extracted mandibular premolars. One millimeter from the apex of each tooth was ground perpendicular to the long axis of the tooth, and the apical surface was polished. Twenty teeth served as the negative control group. One hundred teeth were prepared, obturated, and then divided into 5 retreatment groups. The retreatment procedures were performed using the following files: PTR, Mtwo-R, PTN, TFA, and hand files. After filling material removal, apical enlargement was done using apical size 0.50 mm ProTaper Universal (PTU), Mtwo, PTN, TFA, and hand files. Digital images of the apical root surfaces were recorded before preparation, after preparation, after obturation, after filling removal, and after apical enlargement using a stereomicroscope. The images were then inspected for the presence of new apical cracks and crack propagation. Data were analyzed with χ(2) tests using SPSS 21.0 software. RESULTS: New cracks and crack propagation occurred in all the experimental groups during the retreatment process. Nickel-titanium rotary file systems caused significantly more apical crack formation and propagation than the hand files. The PTU system caused significantly more apical cracks than the other groups after the apical enlargement stage. CONCLUSIONS: This study showed that retreatment procedures and apical enlargement after the use of retreatment files can cause crack formation and propagation in apical dentin.
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spelling pubmed-56821502017-11-15 Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments Özyürek, Taha Tek, Vildan Yılmaz, Koray Uslu, Gülşah Restor Dent Endod Research Article OBJECTIVES: To determine the incidence of crack formation and propagation in apical root dentin after retreatment procedures performed using ProTaper Universal Retreatment (PTR), Mtwo-R, ProTaper Next (PTN), and Twisted File Adaptive (TFA) systems. MATERIALS AND METHODS: The study consisted of 120 extracted mandibular premolars. One millimeter from the apex of each tooth was ground perpendicular to the long axis of the tooth, and the apical surface was polished. Twenty teeth served as the negative control group. One hundred teeth were prepared, obturated, and then divided into 5 retreatment groups. The retreatment procedures were performed using the following files: PTR, Mtwo-R, PTN, TFA, and hand files. After filling material removal, apical enlargement was done using apical size 0.50 mm ProTaper Universal (PTU), Mtwo, PTN, TFA, and hand files. Digital images of the apical root surfaces were recorded before preparation, after preparation, after obturation, after filling removal, and after apical enlargement using a stereomicroscope. The images were then inspected for the presence of new apical cracks and crack propagation. Data were analyzed with χ(2) tests using SPSS 21.0 software. RESULTS: New cracks and crack propagation occurred in all the experimental groups during the retreatment process. Nickel-titanium rotary file systems caused significantly more apical crack formation and propagation than the hand files. The PTU system caused significantly more apical cracks than the other groups after the apical enlargement stage. CONCLUSIONS: This study showed that retreatment procedures and apical enlargement after the use of retreatment files can cause crack formation and propagation in apical dentin. The Korean Academy of Conservative Dentistry 2017-11 2017-11-04 /pmc/articles/PMC5682150/ /pubmed/29142882 http://dx.doi.org/10.5395/rde.2017.42.4.332 Text en Copyright © 2017. The Korean Academy of Conservative Dentistry https://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Özyürek, Taha
Tek, Vildan
Yılmaz, Koray
Uslu, Gülşah
Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments
title Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments
title_full Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments
title_fullStr Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments
title_full_unstemmed Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments
title_short Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments
title_sort incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5682150/
https://www.ncbi.nlm.nih.gov/pubmed/29142882
http://dx.doi.org/10.5395/rde.2017.42.4.332
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