6 才より 11 才における口腔形質の逐年的発育の研究 : 3 発育量の年令間の差

概要

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A series of studies have been undertaken on the growth pattern of various oral traits in school children from 6 to 11 years of age. The subjects were 100 male and 100 female children selected from the first year grade classes of Minami-Kokura public school admitted April, 1956. Plaster cast models of the mouth were taken from every subjects and dimensional measurements were done on these models. Measurement was conducted once yearly at the fixed date and the amounts of yearly growth were calculated for every traits to be studied. Previous publications from our laboratory concerned with the sex difference in these traits. Present study deals with the amounts of growth of these traits and their age difference for both sexes. A total of 48 traits were studied including the physique, breadth of the dental arch, breadth of the mandibular alveolarus, the palatal height, length of the dental arch, and length of palatal vault. The data obtained for these items were computed statistically, using t-test for each group of traits, and mean ratio for the groups. The results obtained were summarised as follows.[table]
1969-07-31