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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doaj-b92bc62eef184bd697cff22fa01dc2382020-11-24T23:07:40ZengHindawi-WileyScanning0161-04571932-87452017-01-01201710.1155/2017/48686034868603Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT StudyAyca Yilmaz0Dilek Helvacioglu-Yigit1Cansu Gur2Handan Ersev3Gullu Kiziltas Sendur4Egemen Avcu5Canan Baydemir6Paul Vincent Abbott7Department of Endodontics, Faculty of Dentistry, Istanbul University, Istanbul, TurkeyDepartment of Endodontics, Faculty of Dentistry, Kocaeli University, Kocaeli, TurkeyDepartment of Endodontics, Faculty of Dentistry, Kocaeli University, Kocaeli, TurkeyDepartment of Endodontics, Faculty of Dentistry, Istanbul University, Istanbul, TurkeyDepartment of Mechatronics Engineering, Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, TurkeyDepartment of Machine and Metal Technologies, Ford Otosan İhsaniye Automotive Vocational School, Kocaeli University, Kocaeli, TurkeyDepartment of Biostatistics, Kocaeli University, Kocaeli, TurkeySchool of Dentistry, University of Western Australia, Perth, WA, AustraliaThe 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.http://dx.doi.org/10.1155/2017/4868603 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ayca Yilmaz Dilek Helvacioglu-Yigit Cansu Gur Handan Ersev Gullu Kiziltas Sendur Egemen Avcu Canan Baydemir Paul Vincent Abbott |
spellingShingle |
Ayca Yilmaz Dilek Helvacioglu-Yigit Cansu Gur Handan Ersev Gullu Kiziltas Sendur Egemen Avcu Canan Baydemir Paul Vincent Abbott Evaluation of Dentin Defect Formation during Retreatment with Hand and Rotary Instruments: A Micro-CT Study Scanning |
author_facet |
Ayca Yilmaz Dilek Helvacioglu-Yigit Cansu Gur Handan Ersev Gullu Kiziltas Sendur Egemen Avcu Canan Baydemir Paul Vincent Abbott |
author_sort |
Ayca Yilmaz |
title |
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_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_sort |
evaluation of dentin defect formation during retreatment with hand and rotary instruments: a micro-ct study |
publisher |
Hindawi-Wiley |
series |
Scanning |
issn |
0161-0457 1932-8745 |
publishDate |
2017-01-01 |
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. |
url |
http://dx.doi.org/10.1155/2017/4868603 |
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