Oral myofunctional and electromyographic evaluation of the orbicularis oris and mentalis muscles in patients with class II/1 malocclusion submitted to first premolar extraction

Oral myofunctional and electromyographic evaluation of the orbicularis oris and mentalis muscles in patients with class II/1 malocclusion submitted to first premolar extraction

Autor Souza, Denize Ramirez de Autor UNIFESP Google Scholar
Semeghini, Tatiana Adamov Google Scholar
Kroll, Lucio Benedito Google Scholar
Berzin, Fausto Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
University of Western São Paulo State
Universidade Estadual de Campinas (UNICAMP)
Resumo OBJECTIVE: The aim of this study was to assess the presence of oral myofunctional alterations before and after first premolar extraction in Class II/1 malocclusion patients that could endanger the long-term dental arch stability. MATERIAL AND METHODS: The study was performed by means of morphological, functional and electromyographic analyses in 17 Class II/1 malocclusion patients (group T) and 17 Class I malocclusion patients (group C -control), both groups with 12-30-year age range (mean age: 20.93 ± 4.94 years). RESULTS: Data analyzed statistically by Student's t-test showed a significant decrease (p<0.05) in the maxillary and mandibular dental arch perimeters after orthodontic treatment, but lip posture at rest did not present statistically significant differences after treatment (p>0.05). The Kruskal-Wallis test analyzed data from lip posture (orbicularis oris muscle) at rest and during swallowing, as well as the mentalis muscle behavior during the above-mentioned function, not showing statistically significant differences (p>0.05) after treatment (groups T1 and T2). However, group T differed significantly from group C (p<0.05). Lip posture during swallowing showed statistically significant differences (p<0.05) for subjects submitted to orthodontic therapy when compared to data acquired before the treatment. The electromyographic analysis confirmed these data. CONCLUSIONS: Found myofunctional alterations observed after the orthodontic treatment in Class II/1 malocclusion seemed to jeopardize the long-term orthodontic stability, making recurrence possible.
Palavra-chave Orbicularis oris muscles
Mentalis muscle
Electromyography
Oral myofunctional evaluation
Tooth extractions
Idioma Inglês
Data de publicação 2008-06-01
Publicado em Journal of Applied Oral Science. Faculdade De Odontologia De Bauru - USP, v. 16, n. 3, p. 226-231, 2008.
ISSN 1678-7757 (Sherpa/Romeo, fator de impacto)
Publicador Faculdade De Odontologia De Bauru - USP
Extensão 226-231
Fonte http://dx.doi.org/10.1590/S1678-77572008000300012
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000256795900012
SciELO S1678-77572008000300012 (estatísticas na SciELO)
Endereço permanente http://repositorio.unifesp.br/handle/11600/4449

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