Abstract
With regard to the vertical problem of skeletal open-bite malocclusion, this study was undertaken to evaluate the effect of upper posterior bite-plane on the dentoskeletal changes of skeletal open-bite malocclusion. The material consisted of 23 patients, with skeletal open-bite in mixed dentition period. The patients were treated by upper removable posterior bite plane appliance. Before and after treatment lateral cephalogram were obtained. Certain angular and linear variables were measured. The pre-treatment and post-treatment measurements were compared using paired t-test to evaluate the significance of the results. There were significant changes in vertical incisor overlap following treatment with upper posterior bite plane. Increase of PFH, Jaraback index, UAFH/LAFH ratio were significant .There was significant decrease in SN-MP angle. The dentoalveolar heights of the upper and lower anterior segment were increased as well as the distance of the lower molars to mandibular plan. Only the maxillary first molar height did not change.
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