title: Prevalence of malocclusions and orthodontic treatment need in 8- to 12-year-old schoolchildren in Casablanca, Morocco.
abstract: OBJECTIVE
  The purpose of this work was to evaluate the prevalence of malocclusions and orthodontic treatment need among schoolchildren in Casablanca, Morocco.
  
  
  METHODS
  A sample of 1000 children aged between 8 and 12 years, with no history of orthodontic treatment, was chosen at random in state schools in different administrative areas of the city of Casablanca. Data was registered using the method of Bjork et al. (1964). Orthodontic treatment need was assessed with the index used by the Swedish National Board of Health (SweNBH).
  
  
  RESULTS
  We found Angle Class I malocclusions in 61.4%, Class II in 24%, Class III in 10% and an indeterminate molar class with one or more missing molars in 4.6% of the children. Overjet was 1-4mm in 63.8%, 4-6 mm in 17.2% and >6 mm in 10%. Bite was normal in 65.4%, 23.6% presented an overbite greater than 4 mm, 1.7% an anterior open bite ≤3 mm, 1.2% an anterior open bite >3 mm and 0.2% a bilateral open bite. Half of the sample presented anterior crowding, while only 2.5% presented posterior crowding. In all, 84.2% of the subjects needed some orthodontic treatment, and 15.8% needed no treatment. No statistically significant difference was found between sex or age and orthodontic treatment need (P>0.05).
  
  
  CONCLUSIONS
  This study found a strong need for orthodontic treatment, confirming the utility of implementing a programme of bucco-dental prevention and screening for malocclusion.
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, University of Hassan II Ain Chok, Casablanca, Morocco.
authors.forename: Farid
authors.initials: F
authors.lastname: Bourzgui
authors.forename: Mourad
authors.initials: M
authors.lastname: Sebbar
authors.forename: Mouna
authors.initials: M
authors.lastname: Hamza
authors.forename: Laila
authors.initials: L
authors.lastname: Lazrak
authors.forename: Zouhair
authors.initials: Z
authors.lastname: Abidine
authors.forename: Farid
authors.initials: F
authors.lastname: El Quars
mesh_terms: D000367:Age Factors; D000848:Anodontia / Q000453:epidemiology; D002648:Child; D003481:Cuspid / Q000002:abnormalities; D003970:Diastema / Q000453:epidemiology; D005260:Female; D006301:Health Services Needs and Demand / Q000706:statistics & numerical data*; D006801:Humans; D007180:Incisor / Q000002:abnormalities; D061326:Index of Orthodontic Treatment Need / Q000706:statistics & numerical data; D008297:Male; D008310:Malocclusion / Q000453:epidemiology*; D008311:Malocclusion, Angle Class I / Q000453:epidemiology; D008312:Malocclusion, Angle Class II / Q000453:epidemiology; D008313:Malocclusion, Angle Class III / Q000453:epidemiology; D008963:Molar / Q000473:pathology; D009018:Morocco / Q000453:epidemiology; D020380:Needs Assessment / Q000706:statistics & numerical data; D024343:Open Bite / Q000453:epidemiology; D057887:Overbite / Q000453:epidemiology; D015995:Prevalence; D012737:Sex Factors; D014071:Tooth Abnormalities / Q000453:epidemiology; D014079:Tooth Eruption, Ectopic / Q000453:epidemiology; D014094:Tooth, Deciduous / Q000473:pathology; D014095:Tooth, Impacted / Q000453:epidemiology; D014096:Tooth, Supernumerary / Q000453:epidemiology; D014504:Urban Health / Q000706:statistics & numerical data