title: Histopathology of the teeth in segmental odontomaxillary dysplasia: new findings.
abstract: Histological examination of the deciduous teeth in two cases of segmental odontomaxillary dysplasia (SOMD) showed fibrous enlargement of the pulps, an irregular pulp/dentine interface displaying many pseudoinclusions and pulp stones. There were tubular defects in the coronal dentine from pulp horn to cusp tip, an irregular tubular structure to the circumpulpal dentine of the apical half, a focally deficient odontoblast layer and widespread external resorption. Together with the clinical features of unilateral maxillary enlargement, upper alveolar expansion in the distal segment, increased spacing and delayed eruption of the deciduous molars and absence of premolar teeth, these histological appearances allow distinction of this condition from fibrous dysplasia (FD), segmental hemifacial hypertrophy (SHH) and regional odontodysplasia (ROD).
authors.affiliation: Department of Paediatric and Preventative Dentistry, Royal Group of Hospitals Trust, Belfast, Northern Ireland, UK.
authors.forename: Conor
authors.initials: C
authors.lastname: Armstrong
authors.forename: Séamus S
authors.initials: SS
authors.lastname: Napier
authors.forename: Robert C
authors.initials: RC
authors.lastname: Boyd
authors.forename: Terry A
authors.initials: TA
authors.lastname: Gregg
mesh_terms: D000539:Alveolar Process / Q000002:abnormalities; D002675:Child, Preschool; D003782:Dental Pulp / Q000002:abnormalities; D003784:Dental Pulp Calcification / Q000473:pathology; D003804:Dentin / Q000002:abnormalities; D006801:Humans; D008297:Male; D008437:Maxilla / Q000002:abnormalities* / Q000473:pathology; D009804:Odontoblasts / Q000473:pathology; D018126:Odontodysplasia / Q000473:pathology*; D014091:Tooth Resorption / Q000473:pathology; D014094:Tooth, Deciduous / Q000002:abnormalities