치과용 콘빔CT영상에서 미니임플란트를 위한 협측피질골 두께

Abstract

Introduction: The thickness of cortical bone is an important factor in mini-implant stability. In this study, we investigated the buccal cortical bone thickness of every interdental area as an aid in planning mini-implant placement. Methods: From the cone-beam computed tomography scans of 20 patients of 20 years, 2-dimensional slices at every interdental area were generated. Buccal cortical bone thickness were measured at 2, 4, and 6 ㎜ levels from the alveolar crest in the interdental bones of posterior regions of both jaws. Intraclass correlation was used to determine intrarater reliability, and analysis of variance (ANOVA) was used to test for differences in cortical bone thickness. Results: Buccal cortical bone thickness was greater in the mandible than in the maxilla. This thickness increased with increasing distance from the alveolar crest in the maxilla and with coming from posterior to anterior in the mandible (p<0.01). The maximum CT value showed increasing tendency with increasing distance from the alveolar crest and with coming from posterior to anterior in both jaws. Conclusions: Interdental buccal cortical bone thickness varies in the both jaws. There appears to be a distinct pattern. Knowledge of this pattern and the mean values for thickness can aid in mini-implant site selection and preparation.