| Autor: |
Davis PJ; Department of Children's Dentistry and Orthodontics, University of Hong Kong, Prince Philip Dental Hospital., Darvell BW |
| Jazyk: |
angličtina |
| Zdroj: |
Community dentistry and oral epidemiology [Community Dent Oral Epidemiol] 1993 Jun; Vol. 21 (3), pp. 162-4. |
| DOI: |
10.1111/j.1600-0528.1993.tb00743.x |
| Abstrakt: |
A radiographic survey of a random sample of 454 girls aged 5.9 +/- 0.5 yr and 521 boys aged 5.8 +/- 0.4 y was undertaken to establish data on the incidence of congenitally missing mandibular incisor teeth amongst the Southern Chinese and to compare these figures with those of a similar previous study of 12-yr-olds so to eliminate factors such a trauma or extractions which may have artificially inflated the 12-yr-old incidence data. The proportion of 5-yr-old girls and boys affected by hypodontia in the permanent mandibular incisor region was 0.086 and 0.046 respectively (a significant difference between sexes, P < 0.02), compared with 0.047 and 0.034 for the 12-yr-olds (a non-significant difference) so other factors must have contributed to the discrepancy between the two groups of children. A very strong correlation (P < 10(-25)) between missing primary and missing permanent mandibular incisors is present in this group, and this has implications for prognosis and treatment planning. A fundamental developmental defect is implied. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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