EVALUATION OF ALVEOLAR BONE THICKNESS AND MANDIBULAR INCISOR INCLINATION: A CBCT ANALYSIS
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Objectives: To assess the labial, lingual, and total apical alveolar bone thickness in patients with mandibular central incisors of different inclination by cone-beam computed tomography (CBCT).Materials and Methods: A retrospective study was conducted using CBCT images of patients presenting for orthodontic treatment at a private orthodontic practice. 100 mandibular central incisors from 50 patients were divided into three groups based on incisor to mandibular plane angle (IMPA), as described by Tweed. CBCT images were oriented along the long axis of each mandibular central incisor, bisecting the pulp and canal in the sagittal and coronal planes, and in a labial-lingual direction in the axial plane. These reformatted CBCT images were used to measure the labial, lingual, and total thickness of the alveolar bone for each mandibular central incisor at the root apex. The Kruskal-Wallis test was used to compare labial, lingual, and total bone thickness among the three groups. Results: Lingual apical alveolar bone thickness was significantly less in the labial inclined incisor group for both right and left mandibular central incisors (p<0.05). No significant differences were found in labial and total apical alveolar bone thickness between groups of mandibular central incisor inclination.Conclusions: Patients with labially inclined mandibular central incisors have less alveolar bone lingual to the root apices than patients with normal and lingually inclined incisors. As such, these patients may be at a higher risk for complications from tooth movement, necessitating particular attention to treatment planning options.