乳児の身体発育と乳歯の関係について

概要

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We have made dental examination of the infants in Gifu with the following result. (The object for our examination is 3, 221 infants containing 1, 699 males and 1, 522 females.) 1. Milkteeth erupt earlier in proportion to infants'body-weight at the time of birth. 2. The eruption of milkteeth is affected by the way of feeding; mixed feeding erupts first in earliness, suckling feeding second and artificial feeding last. 3. Milkteeth erupt in 7.31±0.61 months, on an average (in 7.24±0.06 months in the case of males and in 7.34±0.07 months in the case of females), and the milkteeth of males erupt earlier than those of females. Normal eruption is 79.3 percent, earlier eruption is 19.2 percent and later eruption is 1.5 percent. Earlier eruption is more freqent in our examination than in the other reports. 4. The average number of erupted teeth has no relation to the body-weight at the time of birth, but is larger in proportion to the increase of body-weight. The examination of those who belong to one and same group in the increasing rate of body-weight shows us that milkteeth tend to erupt at the same rate of earliness, irrespective of the various body-weight at the time of birth. 5. Milkteeth erupt earlier in proportion to the statue, body-weight and girth of the chest of infants.
有限責任中間法人日本口腔衛生学会の論文