並列タイトル等Steiner分析を用いた中国人（台湾）学童期の標準値についての研究
一般注記We examined the facial characteristics of Chinese children with normal occlusion using Steiner analysis. Ninety boys and 90 girls who were selected from 5,417 students in a primary school in Taipei, Taiwan, were classified by Hellman’s developmental stage (ⅢA, ⅢB and ⅢC) and chronological age stage Ⅳ (11 y 0 m−13 y 10 m). Angular and linear measurements were determined. In comparison with pre-existing measurement values for Japanese, the SNA angle, SNB angle, SND angle, interincisal angle, and SL values for the Chinese subjects were significantly larger for stages ⅢC and Ⅳ, while L1 to NB, ∠L1 to NB, occlusal plane to SN, GoGn to SN, and SE values were significantly smaller. Compared tomeasurement values for Caucasians, the mean of SNA angle, ANB angle, U1 to NA, ∠U1 to NA, L1 to NB, ∠L1 to NB, and occlusal plane to SN angle were larger among our subjects (stages ⅢC and Ⅳ) and the interincisal angle, SL and SE were smaller. These results demonstrate that Chinese have a more robust growth of the maxilla than Japanese and Caucasians.We also found that although the skeletal Class Ⅱ tendency in Chinese was lower than in Japanese, it was higher than in Caucasians. Although the amount of growth of the mandible in Chinese was greater than in Japanese, it was less than in Caucasians. Although clockwise rotation was also less than in Japanese, it was greater than in Caucasians. Regarding dental structure, although anterior teeth in Chinese tended to have less bimaxillary protrusion than in Japanese, they had greater bimaxillary protrusion than in Caucasians. Although the occlusal plane was flatter than that of Japanese, it was steeper than that of Caucasians. The above findings suggest that when performing orthodontic treatments on Chinese, greater attention is needed when the features of malocclusion are similar to Caucasians.
2015
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