Thesis (M.S.)--University of Michigan, 2002. / Includes bibliographical references.

Thesis (doctoral)--Ludwig-Maximilians-Universität zu München, 1934.

A parte superficial do músculo masseter, subdividido em três regiões - superior, média e inferior - foi estudado por meio da eletromiografia de superfície em pacientes com maloclusão dental classe III de Angle. Participaram deste estudo 14 pacientes (4 do sexo masculino, 10 do sexo feminino, com idade de 7 a 12 anos). Utilizou-se o “scan" nº. 9 do eletromiógrafo modelo K6-I/EMG Eight Channel Surface Electromyograph (Myo-tronics Co., Seatle, WA, EUA). Empregou-se na análise estatística não-paramétrica o teste de Wilcoxon para a comparação entre os lados, e o teste de Friedman para a comparação entre as regiões. Concluiu-se que: (1) nos movimentos de Abertura e Fechamento, Deglutição de Saliva, Oclusão Cêntrica Forçada e Mordida Molar Bilateral com Algodão, houve diferença estatística significante de atividade entre os lados, e o músculo masseter esquerdo apresentou maior atividade eletromiográfica que o músculo masseter direito; (2) a atividade da região superior predominou nas posições de Repouso e Repouso Pós-Exercícios, com diferença estatística significante, seguida pelas atividades das regiões média e inferior, respectivamente; (3) a atividade da região inferior predominou nos movimentos de Propulsão Livre, Deglutição de Água, Deglutição de Saliva e Desvio Lateral Esquerdo sem Contato, com diferença estatística significante, seguida pelas atividades das regiões média e superior, respectivamente; (4) a atividade da região inferior também foi predominante nos movimentos de Abaixamento Livre, Abertura e Fechamento, Abertura contra Resistência e Propulsão contra Resistência, com diferença estatística significante; e (5) a região média apresentou atividade intermediária às demais regiões nas posições de Repouso e Repouso Pós-Exercícios, e nos movimentos de Abertura e Fechamento, Abertura contra Resistência, Propulsão Livre, Deglutição de Água e de Saliva, e Desvio Lateral Esquerdo sem Contato, com diferença estatística significante. / The participation of superior, middle and inferior regions of superficial masseter was evaluated by surface electromyography of 14 patients, 04 male and 10 female, ranging in age from 7 to 12 years, with Angle’s class III dental malocclusion. The Scan #9 of the computerized program of K6-I/EMG Eight Channel Surface Electromyograph system (Myo-tronics Co., Seatle, WA, EUA) was employed with bipolar surface double electrodes. The non-parametric test of Wilcoxon was employed to the comparison between sides, and the non-parametric test of Friedman was employed to the comparison among regions. It was concluded that: (1) at the “opening and closing", “swallowing saliva", “centric occlusion" and “clenching with cotton rolls bilaterally at molar region", there was statistical differences between sides, and the left masseter developed more activity; (2) the superior region developed more activity with statistical differences at “rest" and “rest after exercises" positions, and was followed by the activity of middle and inferior regions, respectively; (3) the inferior region developed more activity with statistical differences at “free protraction of the jaw", “swallowing water", “swallowing saliva" and “lateral movement to the left side without occlusal contact", and was followed by the activity of middle and superior regions, respectively; (4) the inferior region developed more activity with statistical differences at “free opening", “opening and closing", “opening of the jaw against resistance" and “protraction of the jaw against resistance"; and (5) the middle region developed intermediary activity with statistical differences at “rest" and “resting after exercises", and at “opening and closing", “opening the jaw against resistance", “free protraction", “swallowing water", “swallowing saliva", and “lateral movement to the left side without occlusal contact".

Thesis (M.S.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains ix, 204 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 136-139).

Thesis (M.S.)--University of Michigan, 2004. / Includes bibliographical references.

Thesis (M.S.)--University of Southern California, 1997. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Southern California, 1997. / Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 2001. / Includes bibliographical references.

A parte superficial do músculo masseter, subdividido em três regiões - superior, média e inferior - foi estudado por meio da eletromiografia de superfície em pacientes com maloclusão dental classe III de Angle. Participaram deste estudo 14 pacientes (4 do sexo masculino, 10 do sexo feminino, com idade de 7 a 12 anos). Utilizou-se o “scan” nº. 9 do eletromiógrafo modelo K6-I/EMG Eight Channel Surface Electromyograph (Myo-tronics Co., Seatle, WA, EUA). Empregou-se na análise estatística não-paramétrica o teste de Wilcoxon para a comparação entre os lados, e o teste de Friedman para a comparação entre as regiões. Concluiu-se que: (1) nos movimentos de Abertura e Fechamento, Deglutição de Saliva, Oclusão Cêntrica Forçada e Mordida Molar Bilateral com Algodão, houve diferença estatística significante de atividade entre os lados, e o músculo masseter esquerdo apresentou maior atividade eletromiográfica que o músculo masseter direito; (2) a atividade da região superior predominou nas posições de Repouso e Repouso Pós-Exercícios, com diferença estatística significante, seguida pelas atividades das regiões média e inferior, respectivamente; (3) a atividade da região inferior predominou nos movimentos de Propulsão Livre, Deglutição de Água, Deglutição de Saliva e Desvio Lateral Esquerdo sem Contato, com diferença estatística significante, seguida pelas atividades das regiões média e superior, respectivamente; (4) a atividade da região inferior também foi predominante nos movimentos de Abaixamento Livre, Abertura e Fechamento, Abertura contra Resistência e Propulsão contra Resistência, com diferença estatística significante; e (5) a região média apresentou atividade intermediária às demais regiões nas posições de Repouso e Repouso Pós-Exercícios, e nos movimentos de Abertura e Fechamento, Abertura contra Resistência, Propulsão Livre, Deglutição de Água e de Saliva, e Desvio Lateral Esquerdo sem Contato, com diferença estatística significante. / The participation of superior, middle and inferior regions of superficial masseter was evaluated by surface electromyography of 14 patients, 04 male and 10 female, ranging in age from 7 to 12 years, with Angle’s class III dental malocclusion. The Scan #9 of the computerized program of K6-I/EMG Eight Channel Surface Electromyograph system (Myo-tronics Co., Seatle, WA, EUA) was employed with bipolar surface double electrodes. The non-parametric test of Wilcoxon was employed to the comparison between sides, and the non-parametric test of Friedman was employed to the comparison among regions. It was concluded that: (1) at the “opening and closing”, “swallowing saliva”, “centric occlusion” and “clenching with cotton rolls bilaterally at molar region”, there was statistical differences between sides, and the left masseter developed more activity; (2) the superior region developed more activity with statistical differences at “rest” and “rest after exercises” positions, and was followed by the activity of middle and inferior regions, respectively; (3) the inferior region developed more activity with statistical differences at “free protraction of the jaw”, “swallowing water”, “swallowing saliva” and “lateral movement to the left side without occlusal contact”, and was followed by the activity of middle and superior regions, respectively; (4) the inferior region developed more activity with statistical differences at “free opening”, “opening and closing”, “opening of the jaw against resistance” and “protraction of the jaw against resistance”; and (5) the middle region developed intermediary activity with statistical differences at “rest” and “resting after exercises”, and at “opening and closing”, “opening the jaw against resistance”, “free protraction”, “swallowing water”, “swallowing saliva”, and “lateral movement to the left side without occlusal contact”.

Objective: The purpose of the present study is to develop prognostic models for surgical need and treatment success for class III malocclusions. Material and Methods: This is a retrospective cohort study that evaluated treatment outcomes of consecutively treated patients at UCSF from Jan 1st 2007-Jan 1st 2012 and UoP from May 1st, 2014 – May 1st 2019. Receiver operator curves were used to develop prognostic models for surgical need and treatment success for class III malocclusions. Predictor variables were selected a priori (Class III-WITS, U1-PP, IMPA). The prognostic models were validated first using a UCSF validation cohort to show consistency with in one program, and then using consecutively treated patients at UoP from May 1st, 2014 – May 1st 2019 as a second validation group as an outside program. Results: Derivation model for surgical need of class III malocclusion showed high sensitivity (81.8%); high specificity (94.3%), high positive predictive value (81.8%), high negative predictive value (94.3%), and the model correctly classified 91.3% of the subjects. UCSF validation model for surgical need of class III malocclusion showed moderate sensitivity (63.6%), high specificity (91.4%), high positive predictive value (70.0%), high negative predictive value (88.9%), and the model correctly classified 84.8% of the subjects. UoP validation model for surgical need of class III malocclusion showed moderate sensitivity (46.7%), high specificity (97.4%), high positive predictive value (77.8%), high negative predictive value (90.4%), and the model correctly classified 89.1% of the subjects. Derivation model for treatment success of Class III malocclusions showed moderate sensitivity (46.7%); high specificity (85.2%), moderate positive predictive value (63.6%), high negative predictive value (74.2%), and the model correctly classified 71.4% of the subjects. UCSF validation model for treatment success of Class III malocclusions showed low sensitivity (35.0%), moderate specificity (69.6%), moderate positive predictive value (50.0%), moderate negative predictive value (55.2%), and the model correctly classified 53.5% of the subjects. UoP validation model for treatment success of Class III malocclusions showed low sensitivity (16.1%), high specificity (87.5%), moderate positive predictive value (41.7%), moderate negative predictive value (65.3%), and the model correctly classified 62.1% of the subjects. Conclusion: WITS, U1-PP and IMPA were significant predictors of orthognathic surgical need in the derivation group, but only WITS predicted surgical need in the validation groups of Class III Malocclusions. Regarding treatment success, in the derivation group, only U1-PP was significantly associated with treatment success, while no variables were significantly associated with treatment success in the validation groups. Overall, the prognostic models developed in this study are more robust regarding predictions of Class III surgical need, as opposed to treatment success as defined by the ABO Cast and Radiograph examination.