永久歯の萌出時期, 萌出順序の経年的変化に関する研究

概要

論文の詳細を見る
The time and order of eruption of the permanent teeth were studied from the records of longitudinal surveys of 8, 839 students. They were born in 1967-1968, 1970-1971, 1973-1974 and 1976-1977. The mean eruption times were estimated using an arithmetic probability paper. Longitudinal changes in time and order of eruption were determined. The results were as follows: 1) The estimated mean time of eruption could be substituted for the mean time of eruption. 2) The mean time of eruption was earlier in females than in males. 3) Little difference was-found in mean time of eruption between the right and the left. 4) The eruption time of central incisors, lateral incisors and first molars tended to be earlier with time. Canines, first premolars and second premolars tended to erupt later. 5) The eruption time of lower central incisors tended to precede the lower first molars. Upper second premolars tended to erupt later than upper canines.
有限責任中間法人日本口腔衛生学会の論文