Efeitos imediatos da expansão rápida da maxila no sentido sagital, com os disjuntores tipo Haas e Hyrax, em tomografia computadorizada cone beam

• Autor(a) principal: Dias, Daniela Marchiori
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional PUCRS
• Texto Completo: http://hdl.handle.net/10923/406
• topic: ODONTOLOGIA; ORTODONTIA; TÉCNICA DE EXPANSÃO PALATINA; TOMOGRAFIA COMPUTADORIZADA

This study evaluated rapid maxillary expansion (RME) vertical and posteroanterior effects by means of cone- beam computed tomography (CBCT) in 33 patients, comparing tooth tissue–borne (Haas) and tooth-borne expanders (Hyrax). Haas group was composed of 18 subjects (13 girls and 5 boys; mean age, 10 ± 0. 11 years). Hyrax group consisted of 15 subjects (nine girls and six boys; mean age 10 ± 0. 11 years). All appliances were activated up to the full eight mm capacity of the expansion screw. The patients were subjected to a CBCT before (T1) and immediately after (T2) the active phase of expansion, the “growth factor” was not considered. The measures were evaluated by the analysis of variance of mixing model with repeated measures, where the age and sex were controlled by the statistical model. There was a forward movement of the maxilla in Haas group after RME, increasing SNA angle in 1 degree, while there wasn’t any change in the Hyrax group, there was a tendency of decrease the palatine plane and the oclusal plane to sella nasion (SN). Change in the angulation of the maxillary incisor was not significant, a tendency of uprighting was observed in both groups. Within the limits of this study, the results suggest that there weren’t significant changes in both groups in the sagittal plane immediately after rapid maxillary expansion.