Comparison of oral conditions of Tibetans from three different areas I. Eruption of wisdom teeth.:Eruption of Wisdom Teeth

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概要

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• In the countries where dentistry is developed, the number and quality of dentists, the economic conditions of the people, dental education and many other factors influence the oral condition of the people: food style and the natural environment no longer have much effect on oral conditions. On the other hand, in areas where no dentist exists and where people live on natural foods, food style and the natural environment are the most important factors which influence the oral condition.<BR>We made an oral survey of the Tibetans in three quite different areas and got interesting results. With the eruption of wisdom teeth, it is very important to know whether the jaw develops well or not. People whose jaw develops well can grow four normal wisdom teeth. Japanese can not have four normal wisdom teeth any more because of lack of space for wisdom teeth. Only a few modern Japanese can have four normal teeth.<BR>On the other hand, Tibetans have many normal wisdom teeth. The results were as follows: 1) 80% of the 20-years-old villagers in Karakoram (Goma village, 1974) had four normal wisdom teeth. No horizontal or half impacted wisdom teeth were found there. Old people lost many teeth including wisdom teeth because of a high degree of abrasion and the lack of oral hygiene. 2) In northwest Nepal (a very poor village, 1983), many wisdom teeth could not erupt at 20 years of age, but after 25 years 50% of the villagers had four normal wisdom teeth. Even old people still had wisdom teeth probably because of the very low amount and poor quality of the food. 3) In Yunnan (at a Tibetan village, 1989), where villagers can eat a rather large amount of refined and well cooked food, about 40% of the villagers had four well erupted wisdom teeth. Old people lost wisdom teeth because of a high incidence of tooth caries. The causes of tooth caries were lack of oral hygiene and the consumption of rich food.

• 有限責任中間法人 日本口腔衛生学会の論文

有限責任中間法人 日本口腔衛生学会 | 論文

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