Computer-aided three-dimensional assessment of periodontal healing distal to the mandibular second molar after coronectomy of the mandibular third molar: a prospective study

BMC Oral Health

Y. Tan¹  X. Y. Xie²  C. B. Guo³  W. He³  N. H. Cui³  Z. Y. Yan³ 

[1] Department of Medical Statistics, Peking University Clinical Research Institute, Beijing, China;Department of Oral and Maxillofacial Radiology, Peking University School and Hospital of Stomatology, Beijing, China;Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, 22 South Street Zhong Guan Cun, Haidian District, 100081, Beijing, China;

关键词: Coronectomy;    Computer-aided 3D assessment;    Distal intra-bony defect;    Periodontal healing;    Re-contact;    Volume of bone regenerated;   

DOI  :  10.1186/s12903-020-01250-z

来源: Springer

【 摘 要 】

BackgroundThe periodontal healing distal to the mandibular second molar (M2M) after coronectomy of the M3M has shown controversial results. We aimed to combine a digital method with cone-beam computed tomography (CBCT) and estimate periodontal healing of M2M after M3M coronectomy. An accurate and stable indicator in three dimensions was also explored tentatively.MethodsPatients with a M3M in contact with the inferior alveolar canal were included. CBCT was applied immediately after coronectomy (baseline) and 6-months later. Data were investigated with digital software for registration. Previously reported and coronectomy-related factors were included for univariate and multivariate analyses.ResultsA total of 181 patients (213 M3Ms) completed 6-month follow-up. Significant reduction in the distal intra-bony defect (DBD) depth of the M2M was shown (1.28 ± 1.24 mm, P < 0.001). DBD depth of the M2M at baseline was the most influential factor (r = 0.59), followed by preoperative M3M condition, age, rotation and migration of the root complex. Remaining enamel (OR = 6.93) and small retromolar space (0.67) contributed to re-contact of the root complex and M2M. Bone volume regenerated in the distal 2 mm was associated significantly with DBD-depth reduction (r = 0.74, P < 0.001).ConclusionsBone volume regenerated in the distal 2 mm of the M2M denoted stability of distal periodontal healing of the M2M. DBD depth at baseline was the most influential factor for healing of a DBD of the M2M after M3M coronectomy. The remaining enamel and a small retromolar space could contribute to re-contact of the root complex and the M2M.Trial registrationChina Clinical Trial Center, ChiCTR1800014862. Registered 10 February 2018,

【 授权许可】

CC BY