Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatment
ObjectivesUnderstanding the reason for an unsuccessful non-surgical endodontic treatment outcome, as well as the complex anatomy of the root canal system, is very important. This study examined the cross-sectional root canal structure of mandibular first molars confirmed to have failed non-surgical...
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| Language: | English |
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Korean Academy of Conservative Dentistry
2018-05-01
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| Series: | Restorative Dentistry & Endodontics |
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| Online Access: | http://rde.ac/upload/pdf/rde-43-e16.pdf |
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| author | Jiyoung Yoon Byeong-Hoon Cho Jihyun Bae Yonghoon Choi |
| author_facet | Jiyoung Yoon Byeong-Hoon Cho Jihyun Bae Yonghoon Choi |
| author_sort | Jiyoung Yoon |
| collection | DOAJ |
| description | ObjectivesUnderstanding the reason for an unsuccessful non-surgical endodontic treatment outcome, as well as the complex anatomy of the root canal system, is very important. This study examined the cross-sectional root canal structure of mandibular first molars confirmed to have failed non-surgical root canal treatment using digital images obtained during intentional replantation surgery, as well as the causative factors of the failed conventional endodontic treatments.Materials and MethodsThis study evaluated 115 mandibular first molars. Digital photographic images of the resected surface were taken at the apical 3 mm level and examined. The discolored dentin area around the root canal was investigated by measuring the total surface area, the treated areas as determined by the endodontic filling material, and the discolored dentin area.ResultsForty 2-rooted teeth showed discolored root dentin in both the mesial and distal roots. Compared to the original filled area, significant expansion of root dentin discoloration was observed. Moreover, the mesial roots were significantly more discolored than the distal roots. Of the 115 molars, 92 had 2 roots. Among the mesial roots of the 2-rooted teeth, 95.7% of the roots had 2 canals and 79.4% had partial/complete isthmuses and/or accessory canals.ConclusionsDentin discoloration that was not visible on periapical radiographs and cone-beam computed tomography was frequently found in mandibular first molars that failed endodontic treatment. The complex anatomy of the mesial roots of the mandibular first molars is another reason for the failure of conventional endodontic treatment. |
| format | Article |
| id | doaj-art-c848e0ba8be04dbc9a629798a52b0def |
| institution | DOAJ |
| issn | 2234-7658 2234-7666 |
| language | English |
| publishDate | 2018-05-01 |
| publisher | Korean Academy of Conservative Dentistry |
| record_format | Article |
| series | Restorative Dentistry & Endodontics |
| spelling | doaj-art-c848e0ba8be04dbc9a629798a52b0def2025-08-20T03:15:02ZengKorean Academy of Conservative DentistryRestorative Dentistry & Endodontics2234-76582234-76662018-05-01432e1610.5395/rde.2018.43.e16806Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatmentJiyoung Yoon0Byeong-Hoon Cho1Jihyun Bae2Yonghoon Choi3Department of Conservative Dentistry, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, KoreaDepartment of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, KoreaDepartment of Conservative Dentistry, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, KoreaDepartment of Conservative Dentistry, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, KoreaObjectivesUnderstanding the reason for an unsuccessful non-surgical endodontic treatment outcome, as well as the complex anatomy of the root canal system, is very important. This study examined the cross-sectional root canal structure of mandibular first molars confirmed to have failed non-surgical root canal treatment using digital images obtained during intentional replantation surgery, as well as the causative factors of the failed conventional endodontic treatments.Materials and MethodsThis study evaluated 115 mandibular first molars. Digital photographic images of the resected surface were taken at the apical 3 mm level and examined. The discolored dentin area around the root canal was investigated by measuring the total surface area, the treated areas as determined by the endodontic filling material, and the discolored dentin area.ResultsForty 2-rooted teeth showed discolored root dentin in both the mesial and distal roots. Compared to the original filled area, significant expansion of root dentin discoloration was observed. Moreover, the mesial roots were significantly more discolored than the distal roots. Of the 115 molars, 92 had 2 roots. Among the mesial roots of the 2-rooted teeth, 95.7% of the roots had 2 canals and 79.4% had partial/complete isthmuses and/or accessory canals.ConclusionsDentin discoloration that was not visible on periapical radiographs and cone-beam computed tomography was frequently found in mandibular first molars that failed endodontic treatment. The complex anatomy of the mesial roots of the mandibular first molars is another reason for the failure of conventional endodontic treatment.http://rde.ac/upload/pdf/rde-43-e16.pdfmolartooth roottooth apex |
| spellingShingle | Jiyoung Yoon Byeong-Hoon Cho Jihyun Bae Yonghoon Choi Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatment Restorative Dentistry & Endodontics molar tooth root tooth apex |
| title | Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatment |
| title_full | Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatment |
| title_fullStr | Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatment |
| title_full_unstemmed | Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatment |
| title_short | Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatment |
| title_sort | anatomical analysis of the resected roots of mandibular first molars after failed non surgical retreatment |
| topic | molar tooth root tooth apex |
| url | http://rde.ac/upload/pdf/rde-43-e16.pdf |
| work_keys_str_mv | AT jiyoungyoon anatomicalanalysisoftheresectedrootsofmandibularfirstmolarsafterfailednonsurgicalretreatment AT byeonghooncho anatomicalanalysisoftheresectedrootsofmandibularfirstmolarsafterfailednonsurgicalretreatment AT jihyunbae anatomicalanalysisoftheresectedrootsofmandibularfirstmolarsafterfailednonsurgicalretreatment AT yonghoonchoi anatomicalanalysisoftheresectedrootsofmandibularfirstmolarsafterfailednonsurgicalretreatment |