title: Evaluation of treatment for functional posterior crossbite of the deciduous dentition using Planas' direct tracks.
abstract: BACKGROUND
  Functional posterior crossbites are a common finding in children with deciduous teeth and must be treated as soon as they are diagnosed in order to avoid unwanted changes in normal growth and development patterns.
  
  
  OBJECTIVE
  This study objective was to evaluate the changes caused by Planas' direct tracks treatment on the arch dimensions of patients with functional posterior crossbite in first dentition.
  
  
  METHODS
  The sample consisted of 20 children, 4 to 6 years old, divided into two groups, paired up according to age and gender. Group test was composed of 10 patients with functional posterior crossbite treated with PDT. Group control consisted of 10 children with normal occlusion. The evaluation criteria were intercanine and intermolar distances and Carrea's analysis (arch perimeter). All data were collected by a pre-calibrated examiner on study casts obtained at baseline and after 4 months of treatment. The statistical analysis of the data was achieved using GraphPad InStat software, version 3.05 for Windows, with the level of significance set at 0.05. For the comparison between intercanine and intermolar distances, the Tukey-Kramer Multiple Comparisons test was used. When Carrea's analysis was considered, the Mann-Whitney test was used.
  
  
  RESULTS
  At the beginning of the study, all the evaluated criteria showed lower mean values in patients with posterior crossbites, and significant differences between test and control groups were noticed (P<0.05). After the end of follow-up period, these differences could not be verified (P>0.05).
  
  
  CONCLUSIONS
  Within the limits of the present study, it is possible to conclude that the treatment with Planas' direct tracks was able to give back the normal dimensions of deciduous arch in patients with unilateral functional posterior crossbites, thus making it possible a better growth pattern.
authors.affiliation: Department of Dentistry, Ponta Grossa State University, School of Dentistry, Ponta Grossa, Paraná, Brazil. chibinski@br10.com
authors.forename: Ana Cláudia R
authors.initials: AC
authors.lastname: Chibinski
authors.forename: Gislaine D
authors.initials: GD
authors.lastname: Czlusniak
mesh_terms: D016022:Case-Control Studies; D016302:Centric Relation; D002648:Child; D002675:Child, Preschool; D003481:Cuspid / Q000473:pathology; D003724:Dental Arch / Q000473:pathology; D003768:Dental Occlusion, Centric; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000473:pathology / Q000628:therapy*; D008963:Molar / Q000473:pathology; D020247:Myofunctional Therapy / Q000295:instrumentation; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D014094:Tooth, Deciduous / Q000473:pathology*; D016896:Treatment Outcome