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AbstractThe literature is scarce on the intermaxillary elastics impacts on soft tissue during the treatment of Class II malocclusion The purpose of the present study was to compare the soft tissue changes after the treatment of Class II malocclusion using intermaxillary elastics with and without the premolars extraction. The sample consisted of 41 patients Class II Division 1 malocclusion with bilateral molar relationship of at least ½ cusp, divided into two groups. Group 1: 21 patients (mean age 18.97 years) treated for a mean period of 3.15 years with intermaxillary elastics without dental extractions. Group 2: 20 patients (mean age,17.40 years) treated for a mean period of 3.07 years with intermaxillary elastics and extraction of two maxillary premolars. Lateral cephalometric radiographs were used to measure the soft tissue and incisor variations before and after orthodontic treatment. Dolphin Imaging Premium software was used for radiographic analysis. Groups 1 and 2 were highly similar concerning age, initial overjet, molar relationship, treatment time, and initial cephalometric measurements. Statistically significant differences between both groups were observed (P<0.05) related to the anteroposterior position of the lower lip in Group 2 and facial convexity angle in Group 1. Conclusions: Both treatment modalities promoted similar effects on the facial profile, except for the greater retrusion of the lower lip in the protocol with extractions and decrease in the facial convexity in the protocol without extractions. Keywords: Malocclusion. Angle Class II. Orthodontics. Orthodontic Anchorage Procedures. Tooth Extractions ResumoA literatura e escassa quanto ao impacto dos elasticos intermaxilares nos tecidos moles durante o tratamento da ma oclusao de classe II. O objetivo deste trabalho foi comparar as alteracoes tegumentares do tratamento da ma oclusao de Classe II com elasticos intermaxilares sem extracao e com extracoes de pre-molares. A amostra retrospectiva foi de 41 individuos que apresentavam no inicio do tratamento relacao molar de no minimo 1/2 Classe II bilateral e foram divididos em dois grupos. Grupo 1: 21 pacientes (media de idade inicial de 18,97 anos), tratados por um periodo medio de 3,15 anos, sem extracoes e com uso elasticos intermaxilares; Grupo 2: 20 pacientes (media de idade de 17,40 anos), tratados por um periodo medio de 3,07 anos, com extracoes de dois pre-molares superiores e elasticos. As telerradiografias foram usadas para aferir as medidas tegumentares e a variacao dos incisivos antes e depois do tratamento ortodontico atraves do software Dolphin Imaging Premium 11.7. Ambos os grupos mostraram alto grau de compatibilidade nos quesitos idade, overjet inicial, relacao molar, tempo de tratamento e medidas cefalometricas iniciais. Os resultados ao final do tratamento mostraram diferenca estatisticamente significante entre os grupos (p<0,05) na posicao anteroposterior do labio inferior (Grupo 2) e no ângulo de convexidade facial (Grupo 1). Conclusoes: As duas modalidades de tratamento promovem efeitos semelhantes no perfil facial, exceto pela maior retrusao do labio inferior no protocolo com extracoes e diminuicao da convexidade facial no protocolo sem extracoes. Palavras-chave: Ma Oclusao de angle classe II. Ortodontia. Procedimentos de Ancoragem em Orthodontia. Extracao Dentaria.

journal of health sciences

Comparison of Soft Tissue Changes Between Two Class II Malocclusion Treatment Protocols: with and without Extractions Associated to Intermaxillary Elastics