Abstract:

Objective To measure and analyze through cone-beam computed tomography (CBCT) of the incidence of alveolar bone fenestration and dehiscence, as well as the thickness and height of the alveolar bone in the maxillary canine region of adult patients with different sagittal skeletal patterns. Methods A total of 174 adult patients meeting the criteria were selected. In the first step, the incidence rates of fenestration and dehiscence were measured and statistically analyzed after grouping according to ANB. In the second step, the patients with bone fenestration and bone dehiscence were excluded, and the thickness of the alveolar bone at the apical, middle and cervical regions on the labial and palatal sides of the maxillary canine area and the height of the alveolar crest were measured in the remaining samples. Then, the three groups of patients were further divided into three groups according to the FMA for comparison and analysis. Results The incidence of bone fenestration and bone dehiscence in the maxillary canine area was higher in adult patients with skeletal Class Ⅱ. The thickness of the labial alveolar bone at the apical region in skeletal Class Ⅲ was greater than that in skeletal Class Ⅱ and skeletal Class Ⅰ. The thickness of the palatal alveolar bone at the middle root in skeletal Class Ⅱ: average angle > low angle > high angle. In skeletal Class Ⅲ, the thickness of the palatal alveolar bone at the cervical root: low angle > average angle > high angle. Conclusion The incidence of bone fenestration and bone dehiscence was the highest in adult patients with skeletal Class Ⅱ. The thickness of the labial alveolar bone at the apical region was greater in skeletal Class Ⅲ than in skeletal Class Ⅱ and skeletal Class Ⅰ. The thickness of the palatal alveolar bone at the middle root in skeletal Class Ⅱ high angle patients was thinner than that in the average angle and low angle groups, and the thickness of the palatal alveolar bone at the cervical region in skeletal Class Ⅲ was thinner in the high angle group than in the average angle and low angle groups.

Key words: maxillary canine, alveolar bone, CBCT, fenestration, dehiscence