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Previous issue date: 2012-06-22 / The aim of this study was to verify the effects of headgear with combined traction used alone or associated with rapid maxillary expansion on the upper molars, maxilla, mandible and maxillomandibular anteroposterior relationship, as the first step of treatment of Class II malocclusion. The sample comprised 61 patients divided into 3 groups: Group 1, headgear combined traction (CH); Group 2, CH + rapid maxillary expansion (CH + RME); and Group 3, control (CG). In Group 1, patients were treated by headgear with combined traction until a Class I molar relationship was reached. In Group 2, the protocol for headgear was the same; however, the patients received rapid maxillary expansion previously. The results showed distal displacement of molars for both experimental groups (P < 0.001), with distal inclination only in Group 1 (CH) (P < 0.001). There was restriction of the forward growth of the maxilla in Group 2 (CH + RME) (P <0 .05) and clockwise rotation of the maxilla in Group 1 (CH) (P < 0.05). Mandibular projection was observed between T1 and T2 in group 2 (P < 0.05), but no significant difference was found between the other groups (P > 0.05). The maxillomandibular relationship improved in both experimental groups (P < 0.01); however, the variation was greater in group 2 (P < 0.05). Considering the results, it is possible to conclude that the treatment with both protocols was efficient; however, the results were more significant for Group 2 (CH + RME), with shorter treatment time and with less collateral effects. / O objetivo deste estudo foi avaliar os efeitos do Extrabucal com tra??o combinada, usado isoladamente ou associado ? expans?o maxilar, sobre os molares superiores, maxila, mand?bula e a rela??o maxilomandibular como primeira fase de tratamento da maloclus?o de Classe II. A amostra consistiu de 61 indiv?duos divididos em tr?s grupos: Grupo 1 (n=20), com Extrabucal com tra??o combinada (AEB); Grupo 2 (n=21), com Extrabucal com tra??o combinada associado ? expans?o r?pida maxilar (AEB+ERM) e Grupo 3 (n=20), Classe I como controle. No Grupo 1 e no Grupo 2 os indiv?duos foram tratados at? a rela??o molar de Classe I ser atingida.. Os resultados mostraram deslocamento distal dos primeiros molares superiores em ambos os grupos experimentais (P< 0,001), com inclina??o distal muito maior no Grupo 1 (AEB) (P< 0,001). Houve restri??o do deslocamento anterior da maxila nos dois Grupos, mas maior no Grupo 2 entre T1 e T2 ( AEB+ERM) (P<0,05) mas quando comparado entre os grupos, n?o houve diferen?a estat?stica e rota??o hor?ria da maxila nos dois Grupos, mas de maneira significativa no Grupo 1 (AEB) (P<0.05). Foi observada proje??o mandibular entre T1(in?cio do tratamento) e T2 (final do tratamento) no Grupo 2 (P<0,05), mas nenhuma diferen?a significativa foi encontrada entre outros grupos (P>0,05). A rela??o maxilomandibular melhorou em ambos os grupos experimentais (P<0,01), mas a varia??o foi maior no Grupo 2 (P<0,05). Houve rota??o anti-hor?ria mandibular, embora n?o sendo estatisticamente significativa. Considerando os resultados ? poss?vel concluir que o tratamento com ambos os protocolos foi eficiente e os resultados foram mais significativos no Grupo 2 (AEB+ERM), com menor tempo de tratamento e com menos efeitos indesej?veis.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1179 |
| Date | 22 June 2012 |
| Creators | Farret, Milton Meri Benitez |
| Contributors | Lima, Eduardo Martinelli Santayana de |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, BR, Faculdade de Odontologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 500, 600, 4673435736271820140 |
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