下関市、八幡市及び別府市女の歯列弓と口蓋の研究 : 第二編口蓋について

Abstract

To date rather scanty informations are available in relation to the female subjects in the studies on various anatomical traits of the human mouth, in spite of relative abundance of reports accumulated thereon indifferently of sexes. It is especially so, when it deals with comparison between groups of female subjects in the same range of ages residing in the different sections of land. In view of this, a survey has been conducted on 270 female subjects 17 to 29 years of age residing in Shimonoseki, Yawata and Beppu cities, and, as the control, on 100 male subjects 18 to 28 years of age residing in Shimonoseki city. The data of measurement on the tooth bite, dental arch and palate of the subjects were compared between each regional groups, and at the same time comparison between sexes was done with male and female subjects residing in Shimonoseki city. A TOOTH BITE AND DENTAL ARCH 1) Tooth bite and over-bite degrees in the incisor tooth region : There was no difference in the incisor bite degree between each regional group, nor hardly any between both sexes groups. As to the over-bite degree, that in the female of Shimonoseki was the smallest of all. Also that of the female was smaller than that of the male in Shimonoseki with considerable difference present. 2) Dental arch length : No difference was shown to be present between regional as well as sexes groups. 3) Dental arch breadth : Regionally the female in Beppu city is the largest of all, and between sexes the female is smaller than the male with considerable difference present. 4) Dental arch index : Regionally the female in Shimonoseki is the largest, and between sexes the female is larger than the male with considerable difference present there. 5) Dental arch length : Regionally the female in Shimonoseki city was the largest, and between sexes, the female was smaller than the male in lower jaw with considerable difference present there, but almost no difference was present in upper jaw. 6) Circular length of dental arch : Regionally the female in Shimonoseki was by far the largest, but smaller than the male of the same city, with much difference present between both sexes. B THE PALATE 1) Palate height ; In the anterior palate height, the female in Shimonoseki was larger than that in Yawata, but hardly any difference was there between both sexes groups in Shimonoseki. In the posterior palate height, regional difference was not present. Between sexes, the female was smaller than the male with considerable difference. 2) Palate height index : Regionally compared. the female in Shimonoseki was larger than the female in Yawata in the anterior palate height index, while in the posterior palate height index, the female in Beppu was the smallest of all, and in the antero-posterior palate height index, the female in Yawata was the smallest. Between both sexes, hardly any difference was found in the anterior palate height index, but the female was smaller in the posterior palate height index, larger in the antero-posterior index with considerable difference respectively present there. 3) Length of median palatine suture : Regionally speaking, the female in Shimonoseki was considerably larger than the female in Yawata. There was hardly any difference between both sexes. 4) Length of palatal arch : Regional difference was hardly perceptible, but considerable difference was present between both sexes, the female being smaller than the male in this respect. C In summing up the results of these observations, it was concluded that the data for the dental arch and the palate from the female in Shimonoseki was generally larger than those from the female in other cities examined, and that there seemed no appreciable difference between the female groups of Yawata and Beppu. Comparison between both sexes revealed that the female was larger in the dental arch index and the antero-posterior palate height index, but with regard to the