In this study 26 males (average age: 16 y 9 m) and 23 females (average age: 16 y 7 m) were selected from Chungtai Medical Junior College in Taichung, Taiwan. Head films of these students were traced and analysed. Mean values of the Chinese young adults in Taiwan were calculated and the conclusions were as follows: 1) Linear measurements of this present study were compared to Lin's in both males and females. A significant difference was noticed in the skeletal pattern. 2) Angular measurements of this present study were compared to Lin's data of stage IIIC. The gonial angle of this present study was smaller than Lin's data. However, no significant differences were noticed in the positional relationship of upper and lower jaws. 3) Regarding the axes of the anterior teeth, a lingual tipping tendency of the upper anterior teeth and a labial tipping tendency of the lower anterior teeth were observed. 4) The linear measurements in the present study were compared to the Japanese data of stage V. The anterio-posterior dimension of the chinese maxilla was larger than the Japanese. However, there are no significant differences in the position of the upper and lower jaws in females. 5) The measurements of the mandible in this study were smaller than those of the Japanese data. The gonial and mandibular plane angles, especially, were significantly smaller than those of Japanese. 6) The axes of upper and lower anterior teeth of Taiwanese showed more labial tipping than those of Japanese in this study.
A case of oblique facial cleft with supernumerary deciduous molars, probably caused by amniotic bands is reported. Besides facial cleft, and cleft palate and lip, there are sulci on the left side of the face and on the left posterior alveolar ridge. The sulci may be impressions of amniotic bands at a late gestational age and supernumerary teeth may also be related to these amniotic bands.
For correction as well as prevention of malocclusion, information about the bone maturity is very important in treatment planning. In this study, ossification of the distal phalanx of the first digit was used as an indicator of bone maturity. We found significant correlation between this ossification of the phalanx and the cranio-facial development. Stage E2 was reached, on the average, at the age of 6 years 4 months in girls and 8 years 11 months in boys, stage E4 at 12 years 9 months in girls and 14 years 11 months in boys. Girls were ahead of boys, the difference being about two years at both E2 and E4 stages. The degree of the cranio-facial development at stage E2 compared with adults was 83.5% in girls and 83.8% in boys; at stage 4 it was 94.8% in girls and 94.5% in boys. At stages E2 and E4, the cranial base was the most developed, the maxilla was next, and then the mandible. This tendency was found in both boys and girls. A4-Go was the least developed at both E2 and E4 stages. The cranio-facial development in the posterior vertical dimension continued to occur for a long period.
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