Simultaneous Labial and Lingual Augmented Corticotomy Assisted Presurgical Orthodontics in Class III Patients: The Morphological Aspects of the Mandibular Anterior Ridge with Cone-beam computed tomography

Abstract

Objectives: To investigate alveolar bone changes after simultaneously performing labial and lingual augmented corticotomy (LLAC) in patients with insufficient thickness of the alveolar bone in the labial and lingual sides of the mandibular anterior teeth during presurgical orthodontic treatment. Materials and Methods:Twenty-four surgical patients with skeletal Class III malocclusion were included: 10 (LLAC group) accepted LLAC surgery during presurgical orthodontic treatment, and 14 (non-surgery group, NS) accepted traditional presurgical orthodontic treatment. Cone-beam computed tomography (CBCT) scans were obtained before treatment (T0) and at the completion of presurgical orthodontic treatment (T1). The amount of vertical alveolar bone and contour area of the alveolar bone in the labial and lingual sides of mandibular incisors were measured. Results: After presurgical orthodontic treatment, the contour area of the alveolar bone at each level on the lingual side and alveolar bone level on both sides decreased significantly in the NS group (P <0.001). However, the labial and lingual bone contour area at each level and bone level increased significantly in the LLAC group (P <0.001). The bone formation rate in the lingual apical region was the highest, significantly different from other sites (P <0.001). Conclusions: During presurgical orthodontic treatment, LLAC can significantly increase the contour area of the labio-lingual alveolar bone in the mandibular anterior teeth to facilitate safe and effective orthodontic decompensation in skeletal Class III patients. Clinical Relevance: This surgery has positive clinical significance in patients lacking bone thickness (< 0.5mm) in the labial and lingual sides of the lower anterior teeth.