RESUMO
The aim of this study was to examine the bite force and masseter and temporal muscle thickness in individuals with maxillary and mandibular osteoporosis. 72 individuals were distributed into two equal groups: (1) facial osteoporosis and (2) healthy controls. Bite force on the right and left molar regions was recorded with a dynamometer and the highest value out of three measurements was recorded as the maximal bite force. Muscle thickness was measured with a SonoSite Titan ultrasound scanner. Ultrasound images were obtained of the bilateral masseter and temporal muscles at rest and at maximal voluntary contraction. The means of the measurements in each clinical condition were analyzed with multivariate statistical analysis (SPSS 19.0). Student's t test indicated no significant difference for muscle thickness, but indicated significantly lower bite force values in the osteoporosis group (p>0.05). Lower bite force in individuals with facial bone loss demonstrates functional impact of osteoporosis on the complex physiological stomatognathic system.
Assuntos
Doenças Mandibulares , Osteoporose , Força de Mordida , Eletromiografia , Humanos , Músculo Masseter , Músculos da Mastigação , Contração Muscular , Músculo TemporalRESUMO
The aim of this study was to examine the bite force and masseter and temporal muscle thickness in individuals with maxillary and mandibular osteoporosis. 72 individuals were distributed into two equal groups: (1) facial osteoporosis and (2) healthy controls. Bite force on the right and left molar regions was recorded with a dynamometer and the highest value out of three measurements was recorded as the maximal bite force. Muscle thickness was measured with a SonoSite Titan ultrasound scanner. Ultrasound images were obtained of the bilateral masseter and temporal muscles at rest and at maximal voluntary contraction. The means of the measurements in each clinical condition were analyzed with multivariate statistical analysis (SPSS 19.0). Student's t test indicated no significant difference for muscle thickness, but indicated significantly lower bite force values in the osteoporosis group (p>0.05). Lower bite force in individuals with facial bone loss demonstrates functional impact of osteoporosis on the complex physiological stomatognathic system.
Este estudo teve como objetivo analisar a forca de mordida e a espessura dos musculos masseter e temporal em individuos com osteoporose maxilar e mandibular. 72 individuos distribuidos em dois grupos equivalentes: (1) osteoporose facial e (2) controles saudaveis. Forca de mordida nas regioes de molar direita e esquerda foi gravada com o dinamometro e o valor mais alto das tres medidas foi registrado como a forca de mordida maxima. A espessura muscular foi mensurada com ultrassom SonoSite Titan. As imagens de ultrassom foram obtidas dos musculos masseter e temporais bilateral em repouso e em contracao voluntaria maxima. As medias das medidas em cada condicao clinica foram analisadas com a analise estatistica multivariada (SPSS 19.0). Teste t de Student nao revelou diferencas significativas para a espessura musculos, mas indicou valores significativamente mais baixos de forca de mordida no grupo com osteoporose (p> 0,05). Forca de mordida menor em individuos com perda ossea facial demonstra um impacto funcional da osteoporose na fisiologia complexa do sistema estomatognatico.
Assuntos
Humanos , Osteoporose , Doenças Mandibulares , Músculo Temporal , Força de Mordida , Eletromiografia , Músculo Masseter , Músculos da Mastigação , Contração MuscularRESUMO
The objective of this study was to verify the effect of a mandibular repositioning device (MRD) on polysomnographic parameters and on the mean electromyographic activity of the masseter and temporal muscles in individuals with obstructive sleep apnea syndrome (OSAS). This is a prospective cohort study conducted at multidisciplinary OSAS center in a tertiary referral center. Nineteen individuals with mild or moderate OSAS associated with Mallampati 3-4 were treated with an MRD during sleep. The subjects underwent diurnal electromyography (EM) and nocturnal polysomnography (PSG) examinations both prior and after initial treatment (3 months with MRD for PSG and 6 and 12 months of treatment for EM). The examinations performed at different times were compared. Comparison of the initial and final polysomnography examination revealed a significant mean reduction of apnea-hypopnea index (AHI) from 13.8 to 7.8. The successful treatment rate with the MRD was 52.6%, and the improved treatment rate was 68.4%. Patients with lower pre-treatment AHI presented higher rates of cure. There was no statistically significant change in electromyography examination among different times. The MRD reduced the apnea-hypopnea index in individuals with enlarged base of tongue and mild and moderate OSAS without damaging the function of the masseter and temporal muscles as determined by electromyography.
Assuntos
Avanço Mandibular/instrumentação , Placas Oclusais , Aparelhos Ortodônticos Removíveis , Polissonografia , Apneia Obstrutiva do Sono/terapia , Adolescente , Adulto , Idoso , Eletromiografia , Feminino , Humanos , Masculino , Músculo Masseter/fisiopatologia , Pessoa de Meia-Idade , Estudos Prospectivos , Apneia Obstrutiva do Sono/diagnóstico , Apneia Obstrutiva do Sono/fisiopatologia , Músculo Temporal/fisiopatologia , Adulto JovemAssuntos
Humanos , Masculino , Feminino , Criança , Adolescente , Adulto Jovem , Pessoa de Meia-Idade , Idoso de 80 Anos ou mais , Envelhecimento/fisiologia , Mastigação/fisiologia , Estudos Transversais , Contração Muscular/fisiologia , Eletromiografia/métodos , Músculo Masseter/fisiologia , Músculo Temporal/fisiologia , Fatores SexuaisRESUMO
The masticatory process identifies the level of the individual's masticatory ability and provides important information for an adequate diagnosis of the masticatory function. The purpose of this cross-sectional study was to evaluate the influence of age on habitual and non-habitual mastication by means of the values of the ensemble average of masticatory cycles. All volunteers were Brazilian, Caucasian, fully dentate (except for Group I--mixed dentition), aged 7-80 years and divided into five groups: I (7-12 years), II (13-20 years), III (21- 40 years), IV (41-60 years) and V (61-80 years). Except for Group V, which comprised nine women and eight men, all groups were equally divided with respect to gender (20 M/20 F). All subjects were nasal breathers, had normal occlusion and no parafunctional habits or symptoms of temporomandibular dysfunction (RDC/TMD). The masticatory process was analyzed during habitual mastication of peanuts and raisins, and non-habitual mastication of ParafilmM, for 10 seconds each. The resulting electromyographic data were evaluated using SPSS 19.0 software for Windows. ANOVA (analysis of variance) followed by the Duncan test were used to compare the efficiency of the masticatory cycle between age groups. Multivariate analysis (General Linear Models) was used to analyze the effect of age groups and gender on the efficiency of themasticatory cycle, to compare groups (p < 0.05). The results showed that age is directly associated with the changes in masticatory process in healthy subjects.
Assuntos
Envelhecimento/fisiologia , Mastigação/fisiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Estudos Transversais , Eletromiografia/métodos , Feminino , Humanos , Masculino , Músculo Masseter/fisiologia , Pessoa de Meia-Idade , Contração Muscular/fisiologia , Fatores Sexuais , Músculo Temporal/fisiologia , Adulto JovemRESUMO
The masticatory process identifies the level of the individuals masticatory ability and provides important information for an adequate diagnosis of the masticatory function. The purpose of this cross-sectional study was to evaluate the influence of age on habitual and non-habitual mastication by means of the values of the ensemble average of masticatory cycles. All volunteers were Brazilian, Caucasian, fully dentate (except for Group I--mixed dentition), aged 7-80 years and divided into five groups: I (7-12 years), II (13-20 years), III (21- 40 years), IV (41-60 years) and V (61-80 years). Except for Group V, which comprised nine women and eight men, all groups were equally divided with respect to gender (20 M/20 F). All subjects were nasal breathers, had normal occlusion and no parafunctional habits or symptoms of temporomandibular dysfunction (RDC/TMD). The masticatory process was analyzed during habitual mastication of peanuts and raisins, and non-habitual mastication of ParafilmM, for 10 seconds each. The resulting electromyographic data were evaluated using SPSS 19.0 software for Windows. ANOVA (analysis of variance) followed by the Duncan test were used to compare the efficiency of the masticatory cycle between age groups. Multivariate analysis (General Linear Models) was used to analyze the effect of age groups and gender on the efficiency of themasticatory cycle, to compare groups (p < 0.05). The results showed that age is directly associated with the changes in masticatory process in healthy subjects.