Anatomical analysis of the resected roots of mandibular first molars after failed non-surgical retreatment
윤지영, 조병훈, 배지현, 최용훈,
소속 상세정보
윤지영 ( Yoon Ji-Young ) - Seoul National University Bundang Hospital Section of Dentistry Department of Conservative Dentistry
조병훈 ( Cho Byeong-Hoon ) - Seoul National University School of Dentistry Department of Conservative Dentistry
배지현 ( Bae Ji-Hyun ) - Seoul National University Section of Dentistry Department of Conservative Dentistry
최용훈 ( Choi Yong-Hoon ) - Seoul National University School of Dentistry Department of Conservative Dentistry
Abstract
Objectives: Understanding 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 Methods: This 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.
Results: Forty 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.
Conclusions: Dentin 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.
키워드
Molar; Tooth root; Tooth apex
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