Avaliação tridimensional dos efeitos do tratamento ortodôntico associado ao protrator mandibular híbrido do tipo PowerScope® em adolescentes e adultos

Abstract

Objectives: to evaluate dental and skeletal immediate effects and quality of life resulting from the use of fixed functional appliances in adolescent and adult patients. Methods: 8 women and 8 men (mean age – 19.6  4.2 years) were included in the consecutive prospective Class II patients sample treated with fixed orthodontic appliance associated with PowerScope. Teleradiographs and models scanned before (T0) and immediately after use (T1) of the PowerScope were used, in addition to two questionnaires to assess quality of life. The 3D models were superimposed and the difference between the two timepoints was accessed by marking points using the Geomagic software. The cephalograms were verified using the Dolphin Image software. Data was accessed through linear regression and linear surface matrix analysis. The significance level adopted was 5%. Results: The overjet decreased by an average of 2.94 mm. It was observed distalization of the upper molars (-0.3435  0.696 mm) and upper incisors (SN.U1 -5.46  3.10) and greater mesialization of the lower molars (1.7163  1.020mm) and lower incisors (IMPA 5, 49 3.98). There was a statistically significant difference between the patient's age and the mesialization of the lower molar and the retroclination of the upper incisor (SN.U1). The number of breaks in the device showed a statistically significant difference in relation to the difference in overjet between T1-T0. The amount of activation showed a statistically significant difference in relation to the patient's quality of life. Conclusion: Class II correction occurred to a greater extent due to dental movements. Younger patients had greater mesialization of the lower molars and greater retraction of the upper incisors. The number of device breaks influenced the Class II correction. The amount of activation of the mandibular protractor device influenced the patient's quality of life.