頭部X線規格写真による下顎骨形態の3次元的分析法

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Methods for three-dimensional analysis of mandibular morphology and its postoperative change in which three-dimensional coordinate values of the landmarks on the mandible were measured and standardized by a personal computer using simultaneously taken frontal and lateral cephalograms were described and the efficacy of their clinical application was evaluated.<BR>The deviations of standardized three-dimensional coordinate values of six small steel balls placed on the skull which were calculated from eight cephalograms taken in different positions as well as the differences in the distance of these balls calculated from cephalograms and direct measurements were found to be small enough for clinical use. With the exception of 0.7mm in the mean difference of mandibular outline on the ZY-plane, standard deviations of all values evaluated were within 0.5mm in the analysis of U1, L1 and outer shapes of the mandible in 25 patients whose cephalograms were taken preoperatively on two separate occasions within a period of 4 months.<BR>The prediction of postoperative position of the mandible consisted of measuring the amount and direction of the movement of defined points on a dental model and displaying the movement of other bony points in the cephalometric tracings by coordinate transformation. The accuracy of the prediction was studied by comparing the predicted and postoperative positions of the mandible in three-dimensions in 44 patients in whom mandibular prognathism was corrected by the sagittal split osteotomy. The mean differences of coordinate values at L1 were within 0.84mm and the mean differences of mandibular outlines on the XY-, ZY-and ZX-planes were 0.76, 1.09 and 1.58mm, respectively.<BR>Thus, the methods described here proved to be quite useful for the diagnosis, treatment planning and the assessment of postoperative changes in patients with skeletal deformity of the mandible.
社団法人日本口腔外科学会の論文

頭部X線規格写真による下顎骨形態の3次元的分析法

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