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Congenitally missing permanent mandibular incisors and their association with missing primary teeth in the Southern Chinese (Hong Kong)
Author(s) -
Davis P. Jane,
Darvell Brian W.
Publication year - 1993
Publication title -
community dentistry and oral epidemiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.061
H-Index - 101
eISSN - 1600-0528
pISSN - 0301-5661
DOI - 10.1111/j.1600-0528.1993.tb00743.x
Subject(s) - medicine , hypodontia , incidence (geometry) , dentistry , permanent teeth , incisor , mandibular incisor , orthodontics , mandibular lateral incisor , lateral incisor , significant difference , demography , maxillary central incisor , molar , mandibular second molar , physics , sociology , optics
– 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.