Localised enamel hypoplasia of human deciduous canines: genotype or environment?

• DOI: 10.1111/j.1834-7819.2000.tb00246.x
• Publication Date: 2008-03-12T10:49:21Z
• Authors: Sue Taji; Toby Hughes; Jim Rogers; Grant Townsend
• Keywords: Enamel hypoplasia; Dental arch; Mandibular canine

A discrete area of defective enamel formation that appears on the labial surface crowns deciduous canine teeth has been described in both recent and prehistoric human populations, with reported frequencies varying from 1 to 45 per cent. Suggestions about aetiology this localized hypoplasia range genotypic factors environmental conditions systemic effects. The major aims study were describe frequency occurrence pattern expression lesion Australian Aboriginal Caucasian ethnic groups, clarify role genetic by examining a sample twins. consisted dental casts 181 pairs twins, 215 Aborigines 122 singletons, together 253 extracted canines. Examination was undertaken under 2x magnification emphasis being placed upon location lesion. defect observed 49 cent twins 44 Aborigines, but only 36 singletons. percentages affected each group were: 18 17 13 Caucasians. significant proportion defects occurred mesial aspect surface, middle incisocervically, majority lower jaw. number differences between sexes, arches sides. results confirm some findings previous studies, also suggest none environmental, or can be ruled out as involved defect. higher incidence occurring is suggestive physical trauma. Also, vulnerability prominent developing mandibular canine, its thin missing covering bone, would expected lead prevalence Although not definitive, concordance analyses possible predisposition Further research greater clinical orientation determining specific aetiological within any given environment different groups may provide better insight into ambiguous hypoplastic