title: Influence of adenotonsillectomy on hard palate dimensions.
abstract: OBJECTIVE
  To evaluate hard palate width and height in mouth-breathing children pre- and post-adenotonsillectomy.
  
  
  METHODS
  We evaluated 44 children in the 3-6 year age bracket, using dental study casts in order to determine palatal height, intercanine width, and intermolar width. The children were divided into two groups: nasal breathing (n=15) and mouth breathing (n=29). The children in the latter group underwent adenotonsillectomy. The study casts were obtained prior to adenotonsillectomy, designated time point 1 (T1), at 13 months after adenotonsillectomy (T2), and at 28 months after adenotonsillectomy (T3). Similar periods of observation were obtained for nasal breathing children.
  
  
  RESULTS
  At T1, there was a significantly lower intercanine width in mouth breathing children; intermolar width and palate height were similar between groups. After surgery, there was a significant increase in all the analyzed parameters in both groups, probably due to facial growth. Instead, the increase in intercanine width was substantially more prominent in mouth breathing children than in nasal breathing children, and the former difference failed in significance after the procedure.
  
  
  CONCLUSIONS
  There were no significant differences between the nasal-breathing and mouth-breathing children in terms of intermolar width and palatal height prior to or after tonsillectomy. Although intercanine width was initially narrower in the mouth-breathing children, it showed normalization after the surgical procedure. These results confirm that the restoration of nasal breathing is central to proper occlusal development.
authors.affiliation: Department of Orthodontics, University of São Paulo at Ribeirão Preto School of Dentistry, Ribeirão Preto, SP, Brazil. brn_vieira@hotmail.com
authors.forename: Bruno Boaventura
authors.initials: BB
authors.lastname: Vieira
authors.forename: Ana Carolina Meng
authors.initials: AC
authors.lastname: Sanguino
authors.forename: Sara Elisa
authors.initials: SE
authors.lastname: Mattar
authors.forename: Carla Enoki
authors.initials: CE
authors.lastname: Itikawa
authors.forename: Wilma T
authors.initials: WT
authors.lastname: Anselmo-Lima
authors.forename: Fabiana Cardoso Pereira
authors.initials: FC
authors.lastname: Valera
authors.forename: Mírian Aiko Nakane
authors.initials: MA
authors.lastname: Matsumoto
mesh_terms: D002648:Child; D002675:Child, Preschool; D005500:Follow-Up Studies; D006801:Humans; D009058:Mouth Breathing / Q000473:pathology / Q000601:surgery*; D021362:Palate, Hard / Q000033:anatomy & histology* / Q000254:growth & development; D014068:Tonsillectomy