title: Amelogenesis imperfecta: enamel ultra structure and molecular studies.
abstract: Amelogenesis imperfecta (AI) is a hereditary disorder resulting in generalized defects in the enamel. The case reported here is of a seven-year-old male child with yellow color of all his teeth. Two of his primary molars were extracted due to dental abscess with advanced root resorption. Histologically hypoplastic enamel layer, positively birefringent, generalized pitting, roughness with irregular general cracked borders were observed. Scanning electron microscope, revealed extensive irregular, disorganized rough superficial enamel layer. The enamel was irregularly decussate with filamentous prisms accompanied by small rounded formations. The morphological and histological examination of the tooth revealed that this patient has the features of AI. For genetic study blood sample were collected from the patient and PCR analysis revealed that there is no mutation in exons 1-7 of AMELX gene on the X chromosome of the patient. Hence, it is probable that the AI of this patient is not X-linked. It is more likely to be an autosomal mutation.
authors.affiliation: School of Dental Sciences, Universiti Sains Malaysia, Kelantan, Malaysia. gopinath@kb.usm.my
authors.forename: V K
authors.initials: VK
authors.lastname: Gopinath
authors.forename: K A M
authors.initials: KA
authors.lastname: Al-Salihi
authors.forename: Chan Yean
authors.initials: CY
authors.lastname: Yean
authors.forename: Melissa Chan Li
authors.initials: MC
authors.lastname: Ann
authors.forename: M
authors.initials: M
authors.lastname: Ravichandran
mesh_terms: D000567:Amelogenesis Imperfecta / Q000235:genetics / Q000473:pathology*; D002648:Child; D041321:Chromosomes, Human, X / Q000235:genetics; D003743:Dental Enamel / Q000648:ultrastructure*; D003744:Dental Enamel Hypoplasia / Q000473:pathology; D005091:Exons / Q000235:genetics; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning; D008963:Molar / Q000648:ultrastructure; D009154:Mutation / Q000235:genetics; D014094:Tooth, Deciduous / Q000648:ultrastructure