永久歯の生歯期について : CIass unit 4 月と 12 月とした比較
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It is generally established that the time required for individual permanent teeth to come into full eruption range in relatively short period from 2 to 4 years of age. In the study to determine the average age of eruption for individual teeth, if one take one year period for the class unit of variances, there will always be danger to obtain one-sided data of frequency distribution giving incorrect knowledge of average eruption ages. In view of the above consideration, the average eruption time of permanent teeth was comparatively studied on two groups of data obtained from the same population of subjects taking either 4 months or 12 months for the class unit of variances. The results are summarized as follows. 1. It was suggested that the class unit of variances should be limited within 2 or 3 months period for the correct calculation of the average ages for the permanent teeth eruption. 2. For the correct calculation of ages for the first molar eruption, subjects older than 4 years should be selected and studied. 3. The aveage ages for the permanent teeth eruption were calculated as follows : in upper jaw, the first molar 80 months, the central incisor 86 months, the lateral incisor 99 months, the first premolar 111 months, the second premolar 126 months, the cuspid 126 months, and the second molar 147 months, in lower jaw, the first molar 79 months, the central incisor 79 months. the lateral incisor 84 months, the first premolar 117 months, the cuspid 120 months, the second premolar 124 months, and the second molar 136 months.
- 九州歯科学会の論文
- 1963-09-30
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