Journal of the Anthropological Society of Nippon

On the "Deflecting Wrinkle" in Recent Japanese

MAKOTO SUZUKI, TAKURO SAKAI

1956 Volume 65 Issue 2 Pages 49-53
Published: October 30, 1956
Released on J-STAGE: February 26, 2008

DOIhttps://doi.org/10.1537/ase1911.65.49

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On the Occlusal Surface Patterns of Cusps of Maxillary Molars in Recent Japanese

MAKOTO SUZUKI, TAKURO SAKAI

1956 Volume 65 Issue 2 Pages 54-61
Published: October 30, 1956
Released on J-STAGE: February 26, 2008

DOIhttps://doi.org/10.1537/ase1911.65.54

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The distal-lingual cusp (hypocone) is the most recently acquired structure in the evolution of the upper molar. There is a distinct tendency in recent man for the protocone to enlarge at the expense of the paracone, the metacone and especially also of the hypocone. This process becomes more intense from the first to the third molars so that finally one cusp remains on the lingual side and the originally rhomboid angular tooth assumes a more triangular shape.
The hypocone ranges from a size equivalent to that of the other cusps down to a very small cuspule and in many instances is completely absent.
Researches were made on the frequency of appearance of the cusp patterns of maxillary molars-in four forms (4, 4-, 3-, 3) according to DAHLSERG'S classification-and this study was made on 1878 living Japanese and 193 plaster casts.
The following results were obtained:
1) The difference between the rates of appearance of the cusp patterns on living Japanese or plaster casts as between the sexes is not statistically singnificant.
2) The 4 pattern appeared in the first molar in 81.2 per cent of the total number of cases. This rate is fairly low compared with figures for other racial groups.
3) The 4 pattern appeared in the second molar in 4.2 per cent of the total number of cases. This rate is extremely low compared with figures for othe racial groups.
4) In rate of appearance of the cusp patterns no significant difference between male and female can be recognized.
5) The Japanese seem to be highly specialized in a trend toward a reduction in the cusp pattern on the lower molar.

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A Comparative Study of the Structure of Nisei and of Native Japanese

FUSAO ISHIHARA

1956 Volume 65 Issue 2 Pages 62-66
Published: October 30, 1956
Released on J-STAGE: February 26, 2008

DOIhttps://doi.org/10.1537/ase1911.65.62

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An anthropometric examination was conducted of 3563 Niseis, who were born in the United States to parents of pure Japanese stock. As compared with the native Japanese adult, the stature of Nisei is 5 to 9.3cms. greater and the weight 9 to 12kgs. heavier. As shown in Figure 1, the mean growth curve of the Niseis from 6 to 15 years of age is strikingly similar to that of white Americans, but after that age the yearly growth in the case of the latter amounts to 12.8cms. till they become adults whereas in the case of Nisei and Japanese it amounts to only 5.5cms. The second generation Japanese in other countries, such as the Philippines, Sumatra, Korea and Manchuria, do not show such good records of growth, the fiqures falling below those of the native Japanese, by 1 to 4cms. in stature and 5 to 10kgs. in body weight.
On the averge, the leg length of a Nisei is 2.8 to 8.3cms. greater and its ratio to his stature about 1.00 per cent larger than the corresponding figures for a Japanese, and, on the other hand, the sitting height of Nisei is shorter by about 1.2 per cent. It is concluded that leg length of the native Japanese has been shortened, and that their sitting height has increased, as a result of a limitation on growth due to the sedentary habit of daily life.
The biparietal diameter of the head of the Nisei is larger by about 7mms.
than that of the Japanese native with no variation in the occipito-frontal diameter. Therefore, the cephalic index work out on the average to 85 for Niseis, as against 81 for Japanese natives.

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Studies on the Deciduous Dentition of the Japanese and the Japanese-American Hybrids

IV. Deciduous Upper Molars

KAZURO HANIHARA

1956 Volume 65 Issue 2 Pages 67-87
Published: October 30, 1956
Released on J-STAGE: February 26, 2008

DOIhttps://doi.org/10.1537/ase1911.65.67

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This article describes the deciduous upper molars and forms the fourth chapter of my work.

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