Long‐term changes in the anterior alveolar bone after orthodontic treatment with premolar extraction: A retrospective study

摘要

Abstract Objectives To evaluate the morphometric changes in maxillary and mandibular anterior alveolar bone after orthodontic treatment and retention for 18‐24?months by cone‐beam computed tomography (CBCT). Setting and Sample Population Thirty‐four adolescent patients (12 males and 22 females; mean age: 14.29?±?1.24?years) diagnosed with bimaxillary dentoalveolar protrusion and with extractions of the 4 first premolars were included. Materials and Methods The labial and lingual (palatal) alveolar bone thickness, height and root length of the maxillary and mandibular anterior teeth were assessed using CBCT imaging at the pre‐treatment (T1), post‐treatment (T2) and retention phases (T3). Voxel‐based superimpositions of the T2 and T3 images were performed, and the distances of incisal and apical movement between T2 and T3 were measured to determine whether relapses occurred. Results After orthodontic treatment, the labial and lingual (palatal) bone height decreased significantly (P??.05), indicating that no relapses occurred. Conclusions Even though lingual (palatal) alveolar loss occurred due to the orthodontic treatment, the cervical alveolar bone seemed to recover over time. Therefore, appropriate camouflage treatment can be used in patients with bimaxillary dentoalveolar protrusion, and this treatment will not irreversibly deteriorate periodontal health and affect the orthodontic treatment stability.