aluation of bone thickness labially and buccaly in the canine region using CBCT

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Objectives: To propose a method for measuring the labial and buccal bone thickness of alveolar bone at the canine region using CBCT, and to use the established method to compare between Saudi Arabian and Chinese patients.
Materials and methods: A total of 80 patients were CBCT records were obtained and measured. 40 patients were obtained from the orthodontic department of union hospital – Tongji Medical College, P.R.China. and 40 patients were obtained from RAM clinics, Saudi Arabia. NNT software was used in measurements for chinese patients, while VTA software was used for Saudi patients. A unified measuring method was used for all patients. Thicknesses and densities at three levels of the root (cervical, middle and apical regions) were measured from both the lingual and labial sides. Random repeated measures were undertaken to assess accuracy reliability. Statistical analysis was done using the one-way analysis of variance (ANOVA) to detect significant differences among the three groups of skeletal malocclusion between Saudi Arabian and Chinese population.
Results: Apical buccal thickness (ABT) in the four incisors was higher in class II and I patients than in class III patients (p < 0.05). There were significant differences between buccal and lingual surfaces at the apical and middle regions only in class II and III patients. Statistical differences were found between class I and II patients for the cervical buccal density (CBD) and between class II and III patients for apical buccal density (ABD). Relationship between bone thickness and density values ranged from strong at the cervical regions to weak at the apical regions.
Conclusions: Sagittal skeletal patterns affect apical bone thick- ness and density at buccal surfaces of the four lower incisors’