臼歯の頬舌的傾斜の計測における歯冠-歯槽形態に基づく歯軸の有用性の検討

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The purpose of this study was to evaluate usefulness of a coronal-alveolar axis for measuring molar bucco-lingual inclination on three-dimensional digital data of gnathostatic models. The subjects were 6 Japanese adult females (21.3±4.8 years) who underwent surgical orthodontic treatment for mandibular lateral deviation. 3DCT images and gnathostatic models obtained at the first examination were used for the study. The gnathostatic models were scanned with a laser scanner and 3D coordinates were plotted in reference to the Frankfort plane and the mid-sagittal plane. From the first premolar to the second molar in the upper and lower dental arches, a coronal axis was defined as the facial axis of the clinical crown (FACC). A coronal-alveolar axis (CAA) was defined as the line connecting the buccal cusp of the premolar and the most superior point of the buccal groove of the first and second molars, and the deepest point on the alveolar outline. A crown-root axis (CRA) was defined on the 3DCT images where the head position was determined in reference to the Frankfort plane. Each tooth axis was projected to the frontal plane and the angle between the projected axis and the Frankfort plane was measured. According to the Dahlberg formula, in all teeth except the upper second premolar measurement errors were smaller in CAA than in FACC. In all teeth the molar bucco-lingual inclination of the CAA was significantly correlated to that of the CRA with the correlation coefficients of more than 0.7 (p<0.01), but the bucco-lingual inclination of the FACC on the upper and lower second molars were not significantly correlated to that of the CRA. These results suggest that the CAA could be more useful for measuring the molar bucco-lingual inclination as compared with the FACC, for the reproducibility of the measurements and for the similarity to the crown-root axis.
2011-06-30

臼歯の頬舌的傾斜の計測における歯冠-歯槽形態に基づく歯軸の有用性の検討

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