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The longitudinal study of interdental space on deciduous dentition 2. the mandibular arch


, : The longitudinal study of interdental space on deciduous dentition 2. the mandibular arch. Shikwa Gakuho 85(4): 485-497

The purpose of this investigation is to study longitudinal changes in incidence and amount of interdental space accompanying with growth and development of deciduous dentition. Subject materials were 278 dental casts of mandibular archs obtained from 50 noncarious children with normal occlusion. These materials were occluded with maxillary casts which were used in a study already reported. Impressions were taken at 6 mo. intervals from 3.0-6.0 yr of age. The most common area of spacing was distal to the canine from 3 yr and 6 mo. to 4 y and 6 mo.; thereafter, incidence of interdental space in this area clearly decreased. The area showing the lowest incidence of interdental space was between 1st and 2nd deciduous molars throughout the observation periods. At 6 yr of age, the largest spacing (1.0 mm) was between the central and lateral deciduous incisors on the left side. Width of spacing in the A-B areas tended to increase with increasing age. From 3 yr to 3 yr and 6 mo., the socalled primate space C-D was wider than the space at all other zones. Throughout the observation period, the D-E space was consistently the narrowest. In the region of the incisors, total amount of spacing decreased from 3 yr to 3 yr and 6 mo. of age but increased with the passage of time thereafter. In the lateral region, the total amount of spacing decreased throughout the observation period. The total amount of spacing in the mandibular arch remained virtually unaltered throughout the observation period.

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