title: Radiographic features of the jaws and teeth in thalassaemia major.
abstract: OBJECTIVE
  This investigation aimed to compare the radiographic changes and root and crown-body lengths of the mandibular first permanent molar in a group of thalassaemic patients with a control group, matched for age and sex.
  
  
  METHODS
  Panoramic radiographs of 50 thalassaemic patients and 50 controls were examined for the presence of radiological changes. Crown body and root lengths were determined using the method of Seow and Lai. The average lengths were calculated and compared between the two groups.
  
  
  RESULTS
  The mean crown-body and root lengths of the mandibular first molar of patients with thalassaemia major were 9.58+/-0.83 mm and 11.89+/-1.33 mm, while those for the control group were 10.45+/-0.78 mm and 12.78+/-1.67 mm, respectively. A significant difference (P<0.05) was found between the mean crown-body and root values of the two groups. A significant difference (P<0.05) was also found between thalassaemic patients and controls in the occurrence of spiky-shaped roots, root and crown lengths, taurodontism, attenuated lamina dura, enlarged bone marrow spaces, small maxillary sinuses, faint inferior alveolar canal and thin cortex of the mandible.
  
  
  CONCLUSIONS
  While thalassaemia major may not be associated with the occurrence of either vascular canals or prominent antegonial notch, spiky-shaped and short roots, taurodonts, attenuated lamina dura, enlarged bone marrow spaces, small maxillary sinuses, absence of inferior alveolar canal and thin cortex of the mandible were found to be reliable diagnostic criteria for thalassaemia major.
authors.affiliation: Department of Oral Medicine and Oral Surgery, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan. hazza@just.edu.jo
authors.forename: A M
authors.initials: AM
authors.lastname: Hazza'a
authors.forename: G
authors.initials: G
authors.lastname: Al-Jamal
mesh_terms: D000293:Adolescent; D016022:Case-Control Studies; D002648:Child; D005260:Female; D006801:Humans; D007569:Jaw Abnormalities / Q000000981:diagnostic imaging* / Q000209:etiology; D008297:Male; D008334:Mandible / Q000002:abnormalities* / Q000098:blood supply / Q000000981:diagnostic imaging; D008443:Maxillary Sinus / Q000002:abnormalities / Q000000981:diagnostic imaging; D008963:Molar / Q000002:abnormalities / Q000000981:diagnostic imaging; D009811:Odontometry; D011862:Radiography, Panoramic; D014071:Tooth Abnormalities / Q000000981:diagnostic imaging* / Q000209:etiology; D019228:Tooth Crown / Q000002:abnormalities / Q000000981:diagnostic imaging; D014092:Tooth Root / Q000002:abnormalities / Q000000981:diagnostic imaging; D017086:beta-Thalassemia / Q000150:complications* / Q000000981:diagnostic imaging*