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      Inclinação de cabeça durante a mastigação habitual nas deformidades dentofaciais classe II e III Translated title: Head inclination during habitual chewing in the presence of class II and III dentofacial deformities

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          Abstract

          OBJETIVO: este estudo investiga a diferença entre grupos com deformidade dentofacial (padrão classe II e classe III), em relação à preferência mastigatória referida e inclinação de cabeça durante a mastigação, assim como predomínio intra-grupo de cada um desses aspectos, comparativamente a um grupo controle. MÉTODOS: participaram deste estudo, voluntariamente, 25 pacientes (entre 18 e 35 anos). Doze pacientes com diagnóstico de deformidade dentofacial classe II e 13 pacientes com o diagnóstico de classe III esquelética e 10 voluntários, com equivalência em sexo e idade ao grupo de deformidade, formando o grupo controle. Os voluntários da pesquisa foram questionados sobre a existência de um lado de preferência mastigatória. Em seguida foram filmados durante a mastigação habitual de um biscoito maizena e através das imagens captadas, a postura de cabeça pôde ser analisada. RESULTADOS: não houve diferença entre os grupos em relação à preferência mastigatória referida, entretanto os grupos com deformidades dentofaciais apresentaram predomínio significativo de preferência mastigatória referida. Os grupos com deformidade dentofacial apresentaram maior predomínio de inclinação de cabeça durante a mastigação quando comparados ao grupo controle. CONCLUSÃO: indivíduos com deformidade dentofacial podem apresentar uma preferência mastigatória e alteração de postura de cabeça durante a mastigação.

          Translated abstract

          PURPOSE: the study was conducted in order to investigate the difference among groups with class II and class III dentofacial deformities regarding reported chewing side preference and head inclination during chewing and to determine the intra-group predominance for these features when compared to a control group. METHODS: twenty-five volunteers aged from 15 to 34 years took part in the study, 12 of them with a diagnosis of class II dentofacial deformity, 13 with class III dentofacial deformity, and 10 control volunteers aged from 18 to 32 years matched for sex and age to the groups with deformity. The subjects were questioned on the presence of a chewing side preference and were recorded during habitual chewing of a cornstarch cookie for analyzing head posture through the images. RESULTS: there was no difference among the groups regarding reported chewing side preference, although the groups with dentofacial deformities had a significant predominance of reported chewing side preference. The groups with dentofacial deformities showed a greater predominance of head inclination during chewing when compared to the control. CONCLUSION: individuals with dentofacial deformities may show a chewing side preference and changes in head posture during chewing.

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          Physiognomy in the classification of individuals with a lateral preference in mastication.

          Chronic habitual chewers usually present with a lack of passive laterotrusive range of mandibular motion at maximum intercuspation, and many have some form of mandibular asymmetry. This study attempted to discover mechanisms that may be responsible for this association and proposes a system by which such persons can be classified based on physiognomy and patterns of mandibular deviation. The influence of facial biotype and altered head posture on the selection of a preferred chewing side was also analyzed.
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            Functional unilateral posterior crossbite effects on mastication movements using axiography.

            This prospective study investigated the influence of functional unilateral posterior crossbite on mastication movements. The study group included 16 patients (nine girls and seven boys) with functional unilateral posterior crossbite involving three or more posterior teeth. A control group comprised 15 individuals (nine girls and six boys) with normal occlusion and the mean age of both groups was 9.17 years. The mandibular masticatory movements were registered, using computer axiography, for 30 seconds during chewing to determine the preference side of chewing. The patterns of the first, third, and fifth chewing cycles were compared with the preference side to establish whether they would predict the chewing preference side. The extent of the maximal lateral and vertical displacements of the mandible during chewing were compared between study and control groups. This study found that overall the left side was the preferred mastication side in 43.7% of individuals in the study and 46.7% in the control group. There was no relationship between the side of the crossbite and the masticatory preference side (Mc Nemar test, P = .5). No correlation was present between the patterns of chewing movements in the first, third, or fifth cycles. Both study and control groups showed similar maximal lateral and vertical mandible displacement.
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              Occlusion and posture: is there evidence of correlation?

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rcefac
                Revista CEFAC
                Rev. CEFAC
                CEFAC Saúde e Educação (São Paulo )
                1982-0216
                April 2011
                : 13
                : 2
                : 253-258
                Affiliations
                [1 ] Universidade de São Paulo Brazil
                [2 ] Universidade de São Paulo Brazil
                [3 ] Universidade de São Paulo Brazil
                [4 ] Universidade de São Paulo Brazil
                Article
                S1516-18462011000200008
                10.1590/s1516-18462010005000133
                ed5e1efb-b4f6-4214-aec0-016b6ba98cb1

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-1846&lng=en
                Categories
                REHABILITATION

                Physiotherapy
                Malocclusion,Posture,Head,Mastication,Má Oclusão,Postura,Cabeça,Mastigação
                Physiotherapy
                Malocclusion, Posture, Head, Mastication, Má Oclusão, Postura, Cabeça, Mastigação

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