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Atividade dos Músculos Masseteres e Temporais: Eletromiografia Integrada e Força de Mordida Pré e Pós Cirurgia Ortognática. / Activity of the masseter and temporal muscles before and after orthognathic surgery: integrated electromyography and bite force measures.Sampaio, Ana Claudia Martins 01 June 2000 (has links)
Objetivo: Investigar o efeito da cirurgia ortognática sobre a atividade eletromiográfica integrada (EMGI) dos músculos mastigatórios e a força de mordida isométrica máxima (FMIM) e analisar se estes parâmetros alcançam níveis normais após a cirurgia. Modelo: Os pacientes foram avaliados antes da cirurgia ortognática (PRÉ) e 3 a 9 meses após (PÓS). Diferenças foram consideradas significantes ao nível de 5%. Ambiente/Local: Laboratório de Fisiologia, Hospital de Reabilitação de Anomalias Craniofaciais, Universidade de São Paulo, Bauru. Pacientes/Participantes: Dezesseis pacientes com mal-oclusão dentária e 11 indivíduos com oclusão dentária normal (controle). Intervenções: Os pacientes submeteram-se à osteotomia do tipo Le Fort I Variáveis: 1) Atividade EMGI dos músculos masseteres e temporais na contração voluntária isométrica máxima (CVIM) e na percussão voluntária e rítmica dos dentes (PVRD); 2) FMIM medida, bilateralmente, na região dos 1º e 2º premolares. Resultados: Comparativamente ao grupo controle, na CVIM e na PVRD, a atividade EMGI do músculo masseter nos pacientes foi menor no PRÉ e no PÓS, a atividade do músculo temporal foi menor no PÓS e a FMIM foi menor no PRÉ e no PÓS. Na CVIM e na PVRD, os valores no PÓS foram significantemente menores no músculo temporal, comparativamente ao PRÉ, não ocorrendo o mesmo com o músculo masseter. A FMIM no lado direito foi menor no PÓS, comparativamente ao PRÉ, não sendo observadas diferenças no lado esquerdo. Conclusões: A cirurgia ortognática modificou a atividade EMG do músculo temporal e a FMIM do lado direito, entretanto, a função muscular não normalizou após a cirurgia. / Objective: To investigate the effect of the orthognathic surgery on the integrated electromyographic (IEMG) activity of the masticatory muscles and on the maximum isometric bite force (MIBF) and to analyze if these parameters reach normal values following surgery. Design: IEMG activity and bite force were measured before orthognathic surgery (PRE) and 3 to 9 months after (POST). Differences were considerated significant at a level of 5%. Setting: Laboratory of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru. Patients: Sixteen patients with malocclusion and 11 individuals with normal dental occlusion, used as controls. Interventions: Le Fort I osteotomy. Main outcome measures: 1) IEMG activity of the masseter and temporal muscles measured during maximum isometric voluntary clench (MIVC), and voluntary and rhythmic percussion of the teeth (VRPT), and 2) MIBF, measured bilaterally in the area of the 1st and 2nd premolars. Results: During MIVC and VRPT activities the masseter IEMG activity in the group of patients with malocclusion was smaller at PRE and POST, temporal IEMG activity was smaller only at PRE, when compared to the normal group. MIBF was smaller at PRE and POST. Median value observed at POST during MIVC and VRPT activities was significantly small from PRE for the temporal muscle. No significant difference was observed between PRE and POST values for the masseter muscle. MIBF on the right side at POST was smaller that at PRE; no differences were seen on the left side. Conclusions: The orthognathic surgery modified the temporal muscle IEMG activity and MIBF recorded on the right side of the dental arch, however, normal muscular function was not achieved after surgery.
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Análise da morfologia facial e da força de mordida nas deformidades dentofaciais / Facial Morphology and bite force analysis in dentofacial deformitiesSimões, Joana Carolina Martins 27 April 2017 (has links)
A função mastigatória é uma das principais constituintes do sistema estomatognático e impreterivelmente antecede a absorção de nutrientes pelo organismo humano. A força de mordida é um componente dessa função e um indicador clínico do funcionamento desse sistema. Em sujeitos com deformidade dentofacial, a mastigação está prejudicada devido ao desequilíbrio das relações esqueléticas e musculares maxilomandibulares e da oclusão. A abordagem investigativa tridimensional é única que possui a vantagem de avaliar a morfologia facial nos três planos do espaço, tal como se configura a face humana e a deformidade dentofacial. Portanto, o objetivo deste trabalho foi analisar a variação da morfologia facial em diferentes medidas tridimensionais, assim como verificar possível assimetria na força de mordida e diferenças na distribuição de força e área dos contatos oclusais entre sujeitos com deformidades dentofaciais padrão dentoesquelético II, padrão dentoesquelético III e controles. O estudo foi realizado com 77 sujeitos que compuseram dois diferentes grupos, a saber: deformidade dentofacial (DDF) e controle (GC). O grupo com o diagnóstico de deformidade dentofacial (DDF) foi subdividido segundo a classificação da mesma. Assim, 20 sujeitos classe II (4 homens e 16 mulheres, com média de idade de 26 anos) integraram o subgrupo DDF II, 32 classe III (15 homens e 16 mulheres, com média de idade de 27 anos) formaram o DDF III e 25 voluntários saudáveis (9 homens e 16 mulheres, idade média de 24 anos) compreenderam o GC. Todos foram submetidos à avaliação tridimensional da morfologia facial, por meio de escaneamento facial a laser, medidas de força de mordida pelo gnatodinamômetro, análise da distribuição de força oclusal e área de contato dentário pelo sistema T-Scan. As comparações entre GC e DDF foram realizadas pela Análise de Variância (ANOVA) para amostras independentes. O teste de correlação de Spearman foi aplicado para avaliar as possíveis associações entre as medidas de força de mordida e as medidas antropométricas, além da análise de regressão linear múltipla para identificar as variáveis antropométricas associadas à força de mordida. Foi adotado nível de significância de 5%. Na investigação da morfologia, os sujeitos com DDF apresentaram características específicas e compatíveis com as classes II e III esqueléticas, com aumento da altura facial principalmente em retrognatas. A força de mordida foi menor para o grupo DDF, porém não se diferenciou entre os grupos e não houve assimetrias nesse quesito. A área de contato oclusal evidenciou-se mais deficitária para sujeitos com padrão dentoesquelético III, porém a distribuição de força oclusal não demonstrou diferenças entre os grupos. Pode-se concluir o método de análise tridimensional confirmou achados específicos relevantes no que diz respeito às deformidades dentofacias estudadas. E as proporções faciais foram consideradas fatores influenciadores da magnitude da força de mordida em sujeitos com a deformidade dentofacial. / The masticatory function is the one of the main constituents of stomatognathic system and necessarily precedes the absorption of nutrients by the human organism. Bite force is a component of this function and a clinical parameter of this system\'s health. In dentofacial deformity, chewing is impaired due the imbalance of skeletal and muscular maxillomandibular relationships and of the occlusion. Three-dimensioal investigative approach is unique and has the advantage about the evaluation of facial morphology in the three planes of space, such as the configuration of the human face and dentofacial deformity. Therefore, the objective of this study was to analyze the variation of facial morphology in different three-dimensional measurements, as well as to verify possible asymmetry in bite force and the difference in the distribution of force in dental arc and occlusal contact area between subjects with dentofacial deformities class II, class III and control. The study was performed with 77 subjects who composed two different groups: dentofacial deformity (DDF) and control (CG). The group of dentofacial deformity (DDF) was subdivided according to its classification. Thus, 20 class II subjects (4 men and 16 women, mean age of 26 years old) were included in the DDF II subgroup, 32 class III (15 men and 16 women, mean age of 27 years old) formed DDF III, and 25 healthy volunteers (9 men and 16 women, mean age of 24 years old) comprised the CG. All were submitted to the threedimensional assessment of the facial morphology by laser scanning, bite force measurements by gnatodynamometer, analysis of occlusal force distribution and occlusal contact area by the T-Scan system. Comparisons between CG and DDF groups were performed by Analyses of Variance (ANOVA) for independent samples. Spearman\'s correlation test was applied to evaluate the possible association between bite force and anthropometric measurements, as well as multiple linear regression analysis to identify the anthropometric variables associated to the bite force. A significance level of 5% was adopted. In the investigation of morphology the subjects with dentofacial deformities presented specific features and compatible with the skeletal class II and skeletal class III, with increase of facial height, mainly in retrognathic subjects. The bite force was lower for DDF, did not differentiate between the groups and there were no asymmetries about them. The occlusal contact area was found to be poorer for subjects with class III deformity, but the occlusal force distribution did not show differences between the groups. It can be concluded the three-dimensional analysis method confirmed specific and relevant findings to the studied dentofacial deformities. And the facial proportions were considered factors influencing the magnitude of the bite force in subjects with deformity.
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Feeding performance of king mackerel, Scomberomorus cavallaFerguson, Amber Rose 07 July 2014 (has links)
Although bite force is a commonly used metric of feeding performance, other factors such as bite pressure and strike speed are also likely to affect prey capture. Therefore, this study investigated static bite force, dynamic speeds, and predator and prey forces resulting from ram strikes, as well as bite pressure of the king mackerel, Scomberomorus cavalla, in order to examine their relative contributions to overall feeding performance. Theoretical posterior bite force ranged from 14.0-318.7 N. Ram speed, recorded with a rod and reel incorporated with a line counter and video camera, ranged from 3.3-15.8 BL/s. Impact forces on the prey ranged from 0.1-1.9N. Bite pressure, estimated using theoretical bite forces at three gape angles and tooth cross-sectional areas, ranged from 1.7-56.9 MPa. Mass-specific bite force for king mackerel is relatively low in comparison with other bony fishes and sharks, with relatively little impact force applied to the prey during the strike. This suggests that king mackerel rely on high velocity chases and high bite pressure generated via sharp, laterally compressed teeth to maximize feeding performance.
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Masticatory strain and bone growth of two osteogenic surfaces : cranial sutures and the mandibular osteodistraction site /Sun, Zongyang. January 2007 (has links)
Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 184-204).
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A study of a telemetric system for measuring vertical and lateral occlusal forces a thesis submitted in partial fulfillment ... in restorative dentistry ... /Clayton, Joseph A. January 1967 (has links)
Thesis (M.S.)--University of Michigan, 1967.
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A study of a telemetric system for measuring vertical and lateral occlusal forces a thesis submitted in partial fulfillment ... in restorative dentistry ... /Clayton, Joseph A. January 1967 (has links)
Thesis (M.S.)--University of Michigan, 1967.
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Vertical base movement and occlusal force on a mandibular free end partial denture a thesis submitted in partial fulfillment ... in restorative dentistry ... /Baker, Arnold. January 1976 (has links)
Thesis (M.S.)--University of Michigan, 1976.
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A preliminary study of the measurement of denture base forces against the supporting tissues this thesis is presented in partial fulfillment ... denture prosthesis /Stromberg, W. Ross January 1953 (has links)
Thesis (M.S.)--University of Michigan, 1953.
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Comparative in vivo and in vitro studies on the biomechanics of maxillary partial dentures a methodological and experimental study /Fernandes, Cláudio Pinheiro. January 1998 (has links)
Thesis (doctoral)--Lunds Universitet, Malmö, Sweden, 1998. / Added t.p. with thesis statement inserted. Includes bibliographical references.
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Comparative in vivo and in vitro studies on the biomechanics of maxillary partial dentures a methodological and experimental study /Fernandes, Cláudio Pinheiro. January 1998 (has links)
Thesis (doctoral)--Lunds Universitet, Malmö, Sweden, 1998. / Added t.p. with thesis statement inserted. Includes bibliographical references.
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