Coronectomy of mandibular third molars: a clinical and radiological study of 231 cases with a mean follow-up period of 5.7 years

TY - JOUR

T1 - Coronectomy of mandibular third molars

T2 - a clinical and radiological study of 231 cases with a mean follow-up period of 5.7 years

AU - Pedersen, Mads Hagen

AU - Bak, J

AU - Matzen, L H

AU - Hartlev, J

AU - Bindslev, J

AU - Schou, S

AU - Nørholt, S E

N1 - Copyright © 2018 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.

PY - 2018/12

Y1 - 2018/12

N2 - Coronectomy is a widely accepted treatment for mandibular third molars that are in close relationship to the mandibular canal. However, long-term studies on morbidity following this procedure have not been presented. The aim of this study was to examine the long-term morbidity after coronectomy, with sensory disturbances of the inferior alveolar nerve (IAN) and root migration as the primary outcome variables. A total of 231 mandibular third molar coronectomies were performed in 191 patients with a mean follow-up period of 5.7years (range 1-12years). The prevalence of IAN injury was 1.3%, and 3.5% of the retained roots were removed. None of the reoperations to remove the retained roots caused IAN impairment. Infections occurred in 11.7% of the cases and all were treated with antibiotics. Overall, 97% of the retained roots showed signs of migration and 65% showed signs of rotation. Therefore, coronectomy of the mandibular third molars with an intimate relationship to the mandibular canal seems to be a safe treatment modality with a good long-term prognosis.

AB - Coronectomy is a widely accepted treatment for mandibular third molars that are in close relationship to the mandibular canal. However, long-term studies on morbidity following this procedure have not been presented. The aim of this study was to examine the long-term morbidity after coronectomy, with sensory disturbances of the inferior alveolar nerve (IAN) and root migration as the primary outcome variables. A total of 231 mandibular third molar coronectomies were performed in 191 patients with a mean follow-up period of 5.7years (range 1-12years). The prevalence of IAN injury was 1.3%, and 3.5% of the retained roots were removed. None of the reoperations to remove the retained roots caused IAN impairment. Infections occurred in 11.7% of the cases and all were treated with antibiotics. Overall, 97% of the retained roots showed signs of migration and 65% showed signs of rotation. Therefore, coronectomy of the mandibular third molars with an intimate relationship to the mandibular canal seems to be a safe treatment modality with a good long-term prognosis.

KW - coronectomy

KW - follow-up

KW - injuries

KW - mandibular third molar

KW - surgery

U2 - 10.1016/j.ijom.2018.06.006

DO - 10.1016/j.ijom.2018.06.006

M3 - Journal article

C2 - 30017572

SN - 0901-5027

VL - 47

SP - 1596

EP - 1603

JO - International Journal of Oral and Maxillofacial Surgery

JF - International Journal of Oral and Maxillofacial Surgery

IS - 12

ER -