Microradiographic study of amelogenesis imperfecta.
A material of 22 primary and 4 permanent teeth from 22 children with amelogenesis imperfecta (AI) were examined by microradiographic techniques. The children were part of a patient material earlier examined in genetical and clinical studies. The results were compared with corresponding data two non-affected control groups and correlated with the available clinical and genetical data. Teeth were examined from seven of the eight different variants of AI seen in the clinical study. In most cases both hypoplasias and areas of hypomineralization were observed in the same tooth, indicating that both the secretory and the maturation phases of the amelogenesis are affected in AI. In teeth from children with the same clinical variant but different inheritance patterns, no specific finding could be related to a specific inheritance pattern. The findings in the one boy with AI as an X-linked trait were unique in this material. In all control teeth except one, no hypoplasisas or areas of hypomineralization were found in the enamel. In conclusion, the subclassification of AI into different forms can be questioned. Variations in clinical and histologic characteristics connected with the same inheritance pattern suggest that the genetic defect, in conjuction with a large biological variation, could explain the multiplicity in clinical expressivity that characterizes AI.
Bäckman
B
B
Department of Pedodontics, University of Umeå, Sweden.
Anneroth
G
G
D000567:Amelogenesis Imperfecta / Q000145:classification / Q000000981:diagnostic imaging / Q000235:genetics / Q000473:pathology*; D002648:Child; D003743:Dental Enamel / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000473:pathology*; D003744:Dental Enamel Hypoplasia / Q000000981:diagnostic imaging / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008852:Microradiography