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The Effect of Root Canal Preparation on the Development of Dentin Cracks

INTRODUCTION: Root fracture is not an instant phenomenon but a result of gradual development of tiny craze lines in tooth structure. Recent studies have shown that canal instrumentation has the potential to cause dentinal cracks. The purpose of this study was to evaluate and compare the formation of...

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Autores principales: Milani, Amin Salem, Froughreyhani, Mohammad, Rahimi, Saeed, Jafarabadi, Mohammad Asghari, Paksefat, Sara
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Iranian Center for Endodontic Research 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3487527/
https://www.ncbi.nlm.nih.gov/pubmed/23130076
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author Milani, Amin Salem
Froughreyhani, Mohammad
Rahimi, Saeed
Jafarabadi, Mohammad Asghari
Paksefat, Sara
author_facet Milani, Amin Salem
Froughreyhani, Mohammad
Rahimi, Saeed
Jafarabadi, Mohammad Asghari
Paksefat, Sara
author_sort Milani, Amin Salem
collection PubMed
description INTRODUCTION: Root fracture is not an instant phenomenon but a result of gradual development of tiny craze lines in tooth structure. Recent studies have shown that canal instrumentation has the potential to cause dentinal cracks. The purpose of this study was to evaluate and compare the formation of dentinal cracks caused by ProTaper rotary system to hand instrumentation. MATERIALS AND METHODS: This in vitro study was carried out using 57 mandible incisor teeth. The teeth were decoronated. The roots were then examined to exclude cracked samples. A standard model for PDL simulation was used. The teeth were randomly divided into two experimental and one control group (n=19). The teeth in the experimental groups were prepared using hand or ProTaper Universal rotary instrumentation. The teeth in the control group were left unprepared. The teeth were then sectioned horizontally 3 and 6 mm from the apex, and the number of various dentinal defects was recorded using a dental operating microscope. The differences between groups were analyzed with Fisher’s exact test. RESULTS: The hand group demonstrated significantly more defects than the control group (P=0.001). However, there was no significant difference between the rotary compared to the control and hand groups (P>0.05). There was no significant difference between groups with regards to fracture (P>0.05). Other defects including internal, external and surface cracks were more frequent in the hand than in the control or rotary groups (P=0.02), but the difference was not significant between the rotary and control groups (P>0.05). CONCLUSION: Canal preparation, whether hand or rotary, produces structural defects in dentin. The ProTaper rotary system when used according to the manufacturer’s instructions, tends to produce fewer cracks and can be considered a safe preparation technique.
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spelling pubmed-34875272012-11-05 The Effect of Root Canal Preparation on the Development of Dentin Cracks Milani, Amin Salem Froughreyhani, Mohammad Rahimi, Saeed Jafarabadi, Mohammad Asghari Paksefat, Sara Iran Endod J Original Article INTRODUCTION: Root fracture is not an instant phenomenon but a result of gradual development of tiny craze lines in tooth structure. Recent studies have shown that canal instrumentation has the potential to cause dentinal cracks. The purpose of this study was to evaluate and compare the formation of dentinal cracks caused by ProTaper rotary system to hand instrumentation. MATERIALS AND METHODS: This in vitro study was carried out using 57 mandible incisor teeth. The teeth were decoronated. The roots were then examined to exclude cracked samples. A standard model for PDL simulation was used. The teeth were randomly divided into two experimental and one control group (n=19). The teeth in the experimental groups were prepared using hand or ProTaper Universal rotary instrumentation. The teeth in the control group were left unprepared. The teeth were then sectioned horizontally 3 and 6 mm from the apex, and the number of various dentinal defects was recorded using a dental operating microscope. The differences between groups were analyzed with Fisher’s exact test. RESULTS: The hand group demonstrated significantly more defects than the control group (P=0.001). However, there was no significant difference between the rotary compared to the control and hand groups (P>0.05). There was no significant difference between groups with regards to fracture (P>0.05). Other defects including internal, external and surface cracks were more frequent in the hand than in the control or rotary groups (P=0.02), but the difference was not significant between the rotary and control groups (P>0.05). CONCLUSION: Canal preparation, whether hand or rotary, produces structural defects in dentin. The ProTaper rotary system when used according to the manufacturer’s instructions, tends to produce fewer cracks and can be considered a safe preparation technique. Iranian Center for Endodontic Research 2012 2012-10-13 /pmc/articles/PMC3487527/ /pubmed/23130076 Text en Copyright © Iranian Endodontic Journal, 2012. http://creativecommons.org/licenses/by/2.5/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Milani, Amin Salem
Froughreyhani, Mohammad
Rahimi, Saeed
Jafarabadi, Mohammad Asghari
Paksefat, Sara
The Effect of Root Canal Preparation on the Development of Dentin Cracks
title The Effect of Root Canal Preparation on the Development of Dentin Cracks
title_full The Effect of Root Canal Preparation on the Development of Dentin Cracks
title_fullStr The Effect of Root Canal Preparation on the Development of Dentin Cracks
title_full_unstemmed The Effect of Root Canal Preparation on the Development of Dentin Cracks
title_short The Effect of Root Canal Preparation on the Development of Dentin Cracks
title_sort effect of root canal preparation on the development of dentin cracks
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3487527/
https://www.ncbi.nlm.nih.gov/pubmed/23130076
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