Presurgical orthodontic decompensation alters alveolar bone condition around mandibular incisors in adults with skeletal XXXX .

@entity1 @entity604 @entity3233
This study is to use cone beam computed tomography (CBCT) to acquire accurate radiographic images for alveolar bone in lower incisors and the change after presurgical orthodontic treatment. Seventeen @entity1 with skeletal @entity3233 , ten normal occlusion subjects, and fifteen @entity1 treated with orthodontic treatment and orthognathic surgery were included. CBCT images were obtained. The labial and lingual inclinations of mandibular incisors, the @entity604 and root length were measured. Alveolar bone thickness at the apex in @entity1 with skeletal @entity3233 was thinner than normal subjects. The @entity604 heights at labial and lingual sides in @entity1 with skeletal @entity3233 were both reduced compared with normal subjects, especially at the labial side. There were statistically significant correlations between lower incisor inclination and alveolar bone morphology. After orthodontics, the incisors root apex was closer to the lingual side of alveolar bone. The alveolar bone thickness at apex was not statistically changed. The @entity604 heights at the labial and lingual sides were both significantly reduced especially the lingual side after presurgical orthodontic treatment. The root length was not significantly changed. In conclusion, the alveolar bone thickness at apex is thinner and the vertical alveolar height is reduced at the labial side. Forward movement of lower incisors during presurgical orthodontic treatment can render the lower incisors root apex closer to the lingual side and the vertical alveolar height is reduced.
