title: Molar-incisor hypomineralisation: a prevalence study amongst primary schoolchildren of Shiraz, Iran.
abstract: OBJECTIVE
  To investigate the prevalence of molar-incisor hypomineralisation (MIH) amongst primary schoolchildren of Shiraz, Iran, taking into account the possible influence of biographic and socio-demographic parameters.
  
  
  METHODS
  A randomised cluster sample of 9- to 11-year-old children (N = 810) had their first permanent molars and incisors (index teeth) evaluated using the European Academy of Paediatric Dentistry criteria for MIH. The examinations were conducted at schools by a calibrated examiner. Prevalence of MIH was assessed based on biographic and socio-demographic parameters including area of residency, school type, father's level of education, weight-for-age and height-for-age.
  
  
  RESULTS
  Of the children examined, 164/810 (20.2%) had MIH and 53.7% of them presented with MIH lesions in all first molars. Mild defects represented by demarcated yellow brown opacities comprised 35.5% of the total MIH lesions. The prevalence of MIH was significantly greater in girls, children with healthy body weight and height, those whose fathers did not have a tertiary education and from families of low socio-economic status. Regression analyses indicated that none of the biographic and socio-demographic variables represented a significant risk factor in the occurrence of MIH except for body weight. Obesity was negatively correlated to MIH (OR = 0.45; 95% CI 0.25-0.82).
  
  
  CONCLUSIONS
  The prevalence of MIH in a group of Iranian children was 20.2%. Biographic and socio-demographic parameters appeared to have no significant correlation with MIH except body weight, which warrants further research.
authors.affiliation: Cooperative Research Centre for Oral Health Science, Melbourne Dental School, University of Melbourne, Melbourne, VIC, Australia, dentagh@gmail.com.
authors.forename: A
authors.initials: A
authors.lastname: Ghanim
authors.forename: R
authors.initials: R
authors.lastname: Bagheri
authors.forename: A
authors.initials: A
authors.lastname: Golkari
authors.forename: D
authors.initials: D
authors.lastname: Manton
mesh_terms: D001827:Body Height; D001835:Body Weight; D002648:Child; D003744:Dental Enamel Hypoplasia / Q000453:epidemiology*; D004522:Educational Status; D005220:Fathers / Q000193:education; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology; D007492:Iran / Q000453:epidemiology; D008297:Male; D008963:Molar / Q000473:pathology; D009765:Obesity / Q000453:epidemiology; D015995:Prevalence; D012111:Residence Characteristics / Q000706:statistics & numerical data; D012574:Schools / Q000706:statistics & numerical data; D012737:Sex Factors; D012923:Social Class