A BIOMETRIC STUDY ON THE LIVING HUMAN PALATE

概要

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In the normal of 30 to 49 and 50 to 60 years old the circular type of the Papilla incisiva was prevalent and in all the other subject groups the spindle type prevailed. The occurrence of the types other than the circular and spindle types were irregular throughout every subject groups examined. Of the grade of the development of the Papilla incisiva the perfect type occupied more than half of the entire subjects. Generally the perfect type was found markedly frequently at about 20 years of age while a tendency of slight degeneration of the type was found in the old age. About the shape of the Papilla incisiva Mitsui stated that in the boys 10 to 12 years old the spindle type occurred in 44.4 per cent, the bud type in 28.9 per cent, the spear-head type in 14.4 per cent, the elliptic in 7.8 per cent, the triangle in 2.2 per cent and the circular in 2.2 per cent ; Sato stated that in men 20 to 49 years old the pear type occurred in 39.5 per cent, the oval in 18.2 per cent, the circular in 8 per cent, the elliptic in 23.1 per cent and the rod type in 10.5 per cent. Murakami stated that the spindle type was prevalent and Maruyama the elliptic (38.46 per cent). Mitsui stated that in men the spindle type occurred in 27.30 per cent, the spear-head type in 21.36 per cent and the elliptic in 8.93 per cent. The frequencies of the spindle and the spear-head type of the Papilla incisiva by the author's data in the normal 10 to 12 years old were about the same with Mitsui's data for the subjects 10 to 12 years old. The occurrence of the circular and the elliptic was slightly more in the author's data than in Mitsui's. The frequencies of the elliptic and the circular of the Papilla incisiva by the author's data in the normal 22 to 24 years old were nearly the same with Sato's data for the subjects 20 to 49 years old. The frequency of the oval was slightly more in Sato's data than in the author's. The frequency of the elliptic by the author's data in the normal 30 to 49 years old and that in the prisoner were nearly the same with Sato's data for the subjects 20 to 49 years old. The frequency of the spindle type by the author's data in the normal 22 to 24 years old was slightly less than Mitsui's data for the adult and in the normal 30 to 49 and 50 to 60 years old the frequency was nearly the same with Mitsui's data for the adult. The frequency of the spear-head type in the normal 22 to 24 and 30 to 49 years old were less than Mitsui's data for the adult, and the frequency of the elliptic was larger than Mitsui's. Thus the spindle type prevailed in every subject group in agreement with Murakami's report, but divergent from Maruyama's report in which the elliptic occupied 38.46 per cent. In relation to the age changes of the Papilla incisiva Sato stated that its form changed with increasing age from the pear type to the circular or the oval ; Mitsui stated that the spear-head type prevailed in the embryo period, the saddle type in the boyhood and in the adult and the circular in the aged. According to the author's observation, the occurrence of each type of the Papilla incisiva was irregular throughout every age groups of the subjects except that in the normal 7 to 20 years old the spindle type prevails and in the normal 30 to 49 and 50 to 60 years old the circular type becomes prevalent progressively with age. Sato classified the developmental grade of the Papilla incisiva into "superior, " "medium, " "inferior" and "trace, " and he reported on the Japanese that from 5 to 14 years old the "inferior" grade occupied 47.6 per cent of the sudjects ; from 15 years on, however, it increased development and in the subject 20 to 30 years old the "medium" development comes to occupy 46.3 per cent and also the "superior" devevelopment gradually increases in this period. But after 40 years of age the "inferior" development begins to increase again (amounting to occupy 50.0 per cent). If the perfect type in the author's classification is taken to be equivalent to the "medium" to "superior" development in the Sato's classification, the both authors are in good agreement in that the Papilla incisiva reaches its maximum development during boyhood to adulthood of the individual, but declining gradually from the forties onward.
九州歯科学会の論文
1957-03-31

著者

Nakashima Takashi
Department Of Anatomy Faculty Of Medicine Kyushu University:department Of Anatomy Kyushu Dental Coll

A BIOMETRIC STUDY ON THE LIVING HUMAN PALATE

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