| Co-Investigator(Kenkyū-buntansha) |
MILLER M.R 西オーストラリア州保健局, 研究官
NISHIMATA Hiroto Kagoshima University Medical School, 医学部, 講師 (90117531)
TOMOMURA Akito Kagoshima University Dental School, 歯学部附属病院, 助手 (60188810)
OGATA Takahiko Kagoshima University Dental School, 歯学部, 教授 (80136887)
INOUE Masakazu Kagoshima University Dental School, 歯学部, 教授 (30028740)
MILLER Margaret R. Health Department of Western Australia
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| Budget Amount *help |
¥9,900,000 (Direct Cost: ¥9,900,000)
Fiscal Year 1990: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1989: ¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1988: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Research Abstract |
To confirm the effects of rapid transition of eating behavior on the jaw growth and the dental diseases in modern people, the adults (around 50) and the adolescents (high-teens) of both Australian white and aborigine who live in Perth, Western Australia were investigated. Numbers of subjects were 175.
1. Dental diseases
The average numbers of present teeth were 22 to 23 in the white adults, while they were 12 to 16 in the aboriginal adults. However, the average numbers of intact teeth were almost the same in both races. In the adolescents, the average numbers of present teeth were larger than those in the adults and there were no differences among both races. The periodontal indices were lower in the adolescents. But the aboriginal groups showed the higher indices in both generations.
2. Occlusion
In the white adults, the normal occlusion were only at 35 to 40%, and the rest were the malocclusion such as the upper protrusion, the anterior cross bite and the crowding. In the aboriginal adul
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ts, the normal occlusion were at 73 to 75%. In the white adolescents, the normal occlusion were at 41 to 57%, including the orthodontically treated normal occlusion. In the aboriginal adolescents, the normal occlusion were only at 38 to 50%, and the rest were the upper protrusion, the anterior cross bite, the crowding and the open bite.
As the pathogenic factors of malocclusion, the incidences of the discrepancy and the functional factors were less in the aboriginal adults. In the younger generation, however, those incidences were higher in both races. The degree of tooth attrition were grater in the aboriginal adults, and less in the younger generation.
3. Diets
Aboriginal diets were generally higher in saturated fat and cholesterol than caucasian diets. Percentage of energy intake derived from carbohydrates, both simple sugars and starches, was similar for both races. However, caucasian males had a higher total intake of all forms of carbohydrate. The distribution of energy between macronutrients in aboriginal diets was similar to that in the national dietary surveys conducted 5 to 10 years ago. Less
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