乳歯列期から永久歯列期にいたる上顎の歯列弓周長と歯間空隙量の累年的変化

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  • Longitudinal Observations on the Changes in the Interdental Space-Arch Length R elationships for the Maxillary Arch from the Deciduous to the Permanent Dentition

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The purpose of this study was to investigate longitudinal changes in the interdental space-arch length relationships for the maxillary arch from the deciduous to the permanent dentition.<BR>Serial dental casts from 10 boy and 10 girl subjects were evaluated. Impress ion and study models were obtained at 2 month intervals from age 3 years to age 15 years.<BR>The interdental spaces, as well as the arch length parameters were measured in the all of the series of the dental casts.<BR>As a result, the amount of interdental spaces in the primary dentition varied according to position; it was largest between the lateral incisor and canine, followed by the central incisor - lateral incisor, canine - first primary molar and between the central incisors. The amount of interdental spaces, in general, decreased with the transition of the dentition; interdental spaces between lateral incisor central incisor and between central incisors temporarily increased with the progress of the eruption of the permanent incisors. Among all of the interdental spaces between the deciduous teeth, deciduous permanent teeth and between permanent teeth, only the space between the first premolar and second deciduous molar showed negative values (overlapping) temporarily. Such crowding was resolved by the exfoliation of the second deciduous molar. The total amount of interdental spaces decreased continuously until 2 months before the emergence of the permanent central incisors, Rapid increase was observed thereafter up to the emergence of central incisors. After that, increasing and decreasing change varied and occurred repeatedly due to exfoliation of the deciduous teeth and eruption of the succedaneous permanent teeth. The amount of interdental spaces gradually decreased from the 6th year after the emergence of the permanent central incisors and diminished on the whole. The total arch lengths increased rapidly from 1 year before the emergence of the permanent central incisors and reached a plateau thereafter.

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