title: Comparative cephalometric study between nasal and predominantly mouth breathers.
abstract: OBJECTIVE
  To evaluate the possible correlation between the respiratory pattern in determining the craniofacial dimensions, using as baseline the Tweed-Merrifields cephalometric analysis, added to angle SN-GoGn and to Y axis angle.
  
  
  METHODS
  The selected sample to this study comprised 50 teleradiographies taken in lateral and natural positions of the head in young female patients at the age of 9 to 12 years, presenting mean age of 10 years and 5 months and Class 1 malocclusion. After diagnosis of respiratory pattern, the sample was divided into two groups: control group, 25 teleradiographies of nasal breathers in lateral and natural positions of the head; experimental group, 25 teleradiographies of predominantly mouth breathers in lateral and natural positions of the head.
  
  
  RESULTS
  The results were submitted to descriptive analysis (mean and standard deviation), test F and "t" Student test with significance level of 5%. There was no significant difference between the group with nasal breathing and the group with predominantly mouth breathing for any of the studied variables.
authors.forename: Jussara Marinho Dias
authors.initials: JM
authors.lastname: Frasson
authors.forename: Maria Beatriz Borges de Araújo
authors.initials: MB
authors.lastname: Magnani
authors.forename: Darcy Flávio
authors.initials: DF
authors.lastname: Nouer
authors.forename: Vânia Célia Vieira
authors.initials: VC
authors.lastname: de Siqueira
authors.forename: Nádia
authors.initials: N
authors.lastname: Lunardi
mesh_terms: D002508:Cephalometry; D002648:Child; D005147:Facial Bones / Q000000981:diagnostic imaging* / Q000503:physiopathology; D005260:Female; D006801:Humans; D009058:Mouth Breathing / Q000503:physiopathology*; D011859:Radiography; D015656:Respiratory Mechanics / Q000502:physiology*