| Summary: | 碩士 === 高雄醫學大學 === 牙醫學研究所 === 99 === Objective: The purpose of this study is to evaluate palatal bone thickness and bone quality by using cone beam computerized tomograms and to determine if tongue position, presence of posterior dental crossbite, palatal morphology and Frankfurt-mandibular plane angle (FMA) are associated with palatal bone thickness.
Material and Methods: Cone beam computed tomography (CBCT) images were obtained from 30 male subjects (mean, ages 25.79 years; range, ages 23.9-27.7 years) and 28 female subjects (mean, ages 27.66 years; range, ages 25.0-30.3 years). Palatal bone thickness and bone density were measured at 20 unilateral locations along and lateral to midpalatal suture and posterior to incisive foramen. Tongue position and presence of posterior dental crossbite were recorded. Palatal height and palatal width were measured and used to calculate palatal index. Lateral cephalometric radiograph was synthesized from CBCT data and used to determine FMA of each subjects.
Results: Bone density measurements ranged from 492.87 HU to 797.32 HU. Females demonstrated higher bone density values compared to males at 18 locations. For bone thickness measurements, males showed greater palatal bone thickness at almost all sites, but only showed significant difference at 6 locations. Tongue position, presence of posterior crossbite, and palatal morphology did not show clinically significantly relationship with bone thickness. For females, FMA showed significant correlation with bone thickness at 12 locations.
Conclusion: Palatal bone density was greater in female group, but further studies are needed to determine the influence of this finding to clinical success rate of miniscrews. Tongue position, presence of posterior dental crossbite and palatal morphology did not associate with palatal bone thickness. Hyperdivergent females were found to have less bone thickness at mid-posterior palatal area.
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