Document Type : Original Article
Authors
1 Assistant Professor, Department of Orthodontics, School of Dentistry, Yazd Shahid Sadoughi University of Medical Sciences
2 Dentist
Abstract
Statement of Problem: During treatment with functional appliance in patient with class II division I malocclusion, mandible is postured inferiorly and anteriorly. Considering the relation between mandible with tongue and oropharynx space, functional appliance therapy can alter the tongue position and oropharynx space.Purpose: This study aimed to determine the changes of oropharynx space and posterior surface of the tongue position following treatment with Farmand functional appliances in patients with class II division I malocclusions.Materials and method: In this clinical trial study, 28 pre and post treatment cephalometric radiographs of patients with class II division I malocclusions were investigated. The age rang of females was 10-13 years and in males it was 11-14 years. The patients were treated by Farmand functional applicne for 11 months. McNamara analysis and some linear variables were used to determine the positional changes of tongue and oropharynx space. Paired-t test was used to compare the pre and post treatment differences of mean values. Variance analysis was used to compare the growth patterns of the patients.Results: Tongue moved significantly forward (p<0.001) but non–significantly downward. Oropharynx space increased significantly in sagittal dimension (p<0.001). There was a significant correlation between decrease of ANB angle with forward movement of tongue (p<0.05) as well as with the increase in extent of oropharynx space in the sagittal dimension (p<0.05).Conclusion: Treatment with Farmand functional appliance showed significant alteration in tongue position and as a result, increased the extent of oropharyngeal space.Key words: Tongue, Oropharynx space, Class II malocclusion, Farmand functional appliance
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