Abstract
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,
Highlights
The periodontal healing distal to the mandibular second molar (M2M) after coronectomy of the Mandibular third molar (M3M) has shown controversial results
The mean change in the distal intrabony defect (DBD) depth of the Mandibular second molar (M2M) and volume of bone regenerated in the distal 2 mm of the M2M was 1.28 ± 1.24 mm and 39.75 ± 26.03 mm3, respectively
The volume of bone regenerated in the distal 2 mm of the M2M was an effective indicator in three dimensions
Summary
We aimed to combine a digital method with cone-beam computed tomography (CBCT) and estimate periodontal healing of M2M after M3M coronectomy
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