title: The effect of dental overbite on eustachian tube dysfunction in Iranian children.
abstract: OBJECTIVE
  To investigate the association between deep dental overbite and eustachian tube dysfunction.
  
  
  METHODS
  It was designed as a case-control study. Among hospitalized patients in otolaryngology department at Taleghani Hospital in Tehran, Iran, from January to December 2005, 132 patients between the ages of 2 and 6 years were recruited. Dental overbite, overjet, and occlusal relationships were measured by one observer. Eustachian tube dysfunction was defined as having ventilation tubes with an abnormal tympanometry. In addition, demographic information, medical and social histories were prospectively recorded. Univariate and multivariate logistic regression model were used.
  
  
  RESULTS
  In a multivariate model, children with deep bites were 10.6 times more likely to have eustachian tube dysfunction than those without deep bites (P<0.05). Other independent risk factors for eustachian tube dysfunction identified in this model were family history of otitis media, daycare exposure, and non-breast-feeding.
  
  
  CONCLUSIONS
  Children with deep dental overbites are at a significantly increased risk for developing eustachian tube dysfunction.
authors.affiliation: Shahid Beheshti University of Medical Sciences, #4, Kahkeshan Alley, North Dibaji St, Farmanieh St, Tehran, Iran. drpeyman103@hotmail.com
authors.forename: Peyman Nejatbakhsh
authors.initials: PN
authors.lastname: Azadani
authors.forename: Elnaz
authors.initials: E
authors.lastname: Jafarimehr
authors.forename: Abdorahman
authors.initials: A
authors.lastname: Shokatbakhsh
authors.forename: Mohamad Amin
authors.initials: MA
authors.lastname: Pourhoseingholi
authors.forename: Aman
authors.initials: A
authors.lastname: Ghougeghi
mesh_terms: D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005064:Eustachian Tube / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007492:Iran; D008297:Male; D008310:Malocclusion / Q000503:physiopathology*; D011446:Prospective Studies