| Co-Investigator(Kenkyū-buntansha) |
ディエス ドゥグラス ホンデュラス国立自治大学, 歯学部, 助手
BARAHONA Francisco Department of Oral & Maxillofacial Surgery, National University of Honduras Prof, 歯学部, 教授
HONDA Takeshi Department of Oral & Maxillofacial Surgery, Fukuoka Dental University Professor, 教授 (60099067)
DIEZ Douglas Department of Oral & Maxillofacial Surgery, National University of Honduras Assi
ディアス ドウーグラス ホンデュラス国立自治大学, 歯学部, 助手
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| Budget Amount *help |
¥9,300,000 (Direct Cost: ¥9,300,000)
Fiscal Year 1995: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1994: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Research Abstract |
In order to clarify the relationship between onset of temporomandibular arthrosis and masticatory pattern, we conducted a comparative investigation of Hondurans and Xicaque, who are aboriginal Hondurans and have the same roots as Japanese.
1. Methods and materials : Items investigated were frequency of temporomandibular arthrosis, dietary habits, dental attrition and morphological changes in the mandibular condyle. Subjects studied over two years from 1994 to 1995 were 60 Xicaque and 249 other Hondurans. Among them, 60 temporomandibular joints from the 31 Xicaque, 203 from 123 other Hondurans and 52 from 27 Lenqua were referred to via roentogenography.
2. Results : In terms of dietary habits, 80.5% of Xicaque and 73.9% of other Hondurans prefer soft food, with these figures being roughly the same. 54.5% of the Xicaque and 29.4% of other Hondurans suffer temporomandibulararthrosis, and 22.7% of Xicaque and 4.2% of other Hondurans do not habitually brush their teeth, a considerable difference. In terms of dental attrition, Broca's classification I, II and III ratio were 5 : 7 : 3 for Xicaque, 5 : 4 : 4 for Lenqua and 3 : 8 : 2 for other Hondurans.
In addition, based on preliminary research of 172 temporomandibular joints from American Indian skull/jaw bones owned by smithonian Museum, U.S.A., and the University of Michigan, results were obtained that as the Broca's classification advanced from I to II to III, the more the mandibular condyle morphology changed from round to convex to flat to ultraflat.
The skeletal system, including the temporomandibular joint, of the Xicaque was found through X-rays to be not welldeveloped, compared to that of other Hondurans and Japanese. Remodeling of the condyle tended to be small.
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