1. 日本人一般集団における上顎歯列形態 および口蓋形態の三次元的成長様相.
- Author
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小山未来 and 不島健持
- Subjects
DENTAL arch ,AGE ,DENTAL maturity ,JAPANESE people ,MOLARS - Abstract
The purpose of this study was to examine growing changes of the maxillary dentition and alveolar base (ALB) including the palate, and investigate its relationship with malocclusion. Digital models of maxillary digital casts at 8, 11, and 14 years of age were longitudinally collected from schoolchildren (27 boys and 19 girls) as a general Japanese population. Three-dimensional morphologies of dental arch and ALB, including the palate, were measured, and growth changes were examined based on chronological and dental age. In addition, in 29 boys at 14 years, the relationships of palatal volume (PV), surface area (PS) and depth (PD) as well as ALB morphologies, against to arch length discrepancy (ALD) and dental arch width were investigated. Dental arch width measured at the first molar (M1-DAW) and its basal arch width (BAW), PV and PD increased significantly from 8 to 11 years and from 11 to 14 years. On the other hand, dental age-based assessment did not show clear differences compared with the chronological age-based assessment. In terms of gender difference, M1- DAW of male was significantly larger than females at all ages, and PD of the male was significantly larger than females at 8 and 14 years. ALD and M1-DAW were set as indices of malocclusion, and their relationships with dental arches and ALB were investigated. ALD showed a significantly high correlation with M1-DAW, basal arch length (BAL), PV and PS, but no relationship with DAW at canine was observed. M1-DAW showed a significant correlation with BAW and BAL, and with PV and PS, but no association with PD was observed. Dental arch dimensions and ALB morphologies including palate increased over time from 8 to 14 years, and correlated with each other. These growth changes were more clearly indicated by chronological age than by dental age. [ABSTRACT FROM AUTHOR]
- Published
- 2023