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Factors affecting root migration after coronectomy of the mandibular third molar

Authors
 Nan-Ju Lee  ;  Seo-Yeon Jung  ;  Kyeong-Mee Park  ;  Yiseul Choi  ;  Jisun Huh  ;  Wonse Park 
Citation
 MEDICINE, Vol.100(20) : e25974, 2021-05 
Journal Title
MEDICINE
ISSN
 0025-7974 
Issue Date
2021-05
MeSH
Adult ; Cone-Beam Computed Tomography ; Female ; Humans ; Male ; Mandible / diagnostic imaging ; Mandible / innervation ; Mandible / surgery ; Mandibular Nerve / diagnostic imaging ; Mandibular Nerve Injuries / etiology ; Mandibular Nerve Injuries / prevention & control* ; Middle Aged ; Molar, Third / diagnostic imaging ; Molar, Third / surgery* ; Oral Surgical Procedures / adverse effects* ; Retrospective Studies ; Tooth Crown / surgery ; Tooth Migration / diagnosis ; Tooth Migration / etiology* ; Tooth Root / diagnostic imaging ; Tooth, Impacted / surgery* ; Young Adult
Abstract
Nerve injury especially inferior alveolar nerve (IAN) is the one of the complications that occur when the mandibular third molar (M3) is extracted and in case of high risk patients, coronectomy might be an alternative to tooth extraction. The purpose of this retrospective study was to analyze root migration and its influencing factors at 6 months after coronectomy in both 2- and 3-dimensions using periapical view and cone-beam computed tomography (CBCT). We analyzed 33 cases of root remnant after coronectomy and measured the amount of migration in CBCT. The following factors that could possibly affect root migration were also analyzed: age, gender, number of M3 roots, shape of M3s, Pell, and Gregory classification, mesiodistal (MD) angulation, buccolingual (BL) angulation, contact point with the second molar, root curvature, and complete removal of the coronal portion. Migration of greater than 2 mm was found in 64% of the roots in the 2-dimensional (2D) analysis, and the average root migration was 4.11 mm in the 3-dimensional (3D) analysis. The factors affecting migration were the root morphology, complete removal of the coronal portion, impaction depth, and MD angulation in the 2D analysis, and MD and BL angulation in the 3D analysis. Ensuring sufficient space for root migration especially considering angulation, depth and complete removal of the coronal portion might be important factors after coronectomy of the M3. Root remnant after coronectomy of M3 may migrate in young patients who has sufficient empty coronal space and this may reduce the nerve damage by the separation of IAN and M3.
DOI
10.1097/MD.0000000000025974
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
Yonsei Authors
Park, Wonse(박원서) ORCID logo https://orcid.org/0000-0002-2081-1156
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/184138
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