乳歯の出生順位別観察について

概要

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In 1959 a group of 333 infants in Tokyo, off first-or second-born, were subject to collective dental examination, and the first-born and second-born groups were compared as to the eruption of deciduous teeth and decayed teeth (def). The results were as shown below:<BR>As for the eruption of deciduous teeth, the firstborn group had less teeth appearing than the secondborn group at each age, particularly at one and five. In other words, the first-born are slower than the second-born in having deciduous teeth and more-liable to lose them latter.<BR>Generally, decayed teeth were found more of ten among the second-born proximal surface and distall proximal surface of the lower lateral milk incisor, and the labial and buccal surface infour-year-olds.