The associations between work-related factors and temporomandibular disorders among female full-time employees: findings from the Fourth Korea National Health and Nutrition Examination Survey IV (2007–2009)

BACKGROUND: The aim of this study was to investigate the association between work-related factors and temporomandibular disorders (TMD) among female full-time employees using representative data from a national population-based survey. METHODS: Data from the Fourth Korea National Health and Nutrition Examination Survey IV (2007–2009) were used to analyze 1,612 women. Complex samples logistic regression was applied for adjusting for general characteristics and work-related factors to examine the association between work-related factors and TMD. RESULTS: The prevalence of TMD was 12.8% in this study population. With respect to age, educational status, marital status, problem drinking, exercise, and stress, there were statistically significant differences in the prevalence of TMD. In logistic regression analyses on complex samples, based on 40 h or less per week, odds ratios (ORs) for respondents who worked 40–48 working hours, 49–60 working hours, and more than 60 h were 1.16 (95% confidence interval (CI) 0.69–1.94), 1.41 (95% CI 0.79–2.54), and 2.43 (95% CI 1.29–4.59), after adjusting for general characteristics, working schedule, employment status, and occupation. CONCLUSIONS: This study found that long working hours were significantly associated with TMD in Korean female full-time employees.

Clinical Signs and Subjective Symptoms of Temporomandibular Disorders in Instrumentalists

PURPOSE: Most of the reports on instrumentalists' experiences of temporomandibular disorders (TMD) have been reported not by clinical examinations but by subjective questionnaires. The aim of this study was to investigate the clinical signs and subjective symptoms of TMD in a large number of instrumentalists objectively. MATERIALS AND METHODS: A total of 739 musicians from a diverse range of instrument groups completed a TMD questionnaire. Among those who reported at least one symptom of TMD, 71 volunteers underwent clinical examinations and radiography for diag-nosis. RESULTS: Overall, 453 participants (61.3%) reported having one or more symptoms of TMD. The most frequently reported symptom was a clicking or popping sound, followed by temporomandibular joint (TMJ) pain, muscle pain, crepitus, and mouth opening limitations. Compared with lower-string instrumentalists, a clicking or popping sound was about 1.8 and 2 times more frequent in woodwind and brass instrumentalists, respectively. TMJ pain was about 3.2, 2.8, and 3.2 times more frequent in upper-string, woodwind, and brass instrumentalists, respectively. Muscle pain was about 1.5 times more frequent in instrumentalists with an elevated arm position than in those with a neutral arm position. The most frequent diagnosis was myalgia or myofascial pain (MFP), followed by disc displacement with reduction. Myalgia or MFP was 4.6 times more frequent in those practicing for no less than 3.5 hours daily than in those practicing for less than 3.5 hours. CONCLUSION: The results indicate that playing instruments can play a contributory role in the development of TMD.

Clinical Signs and Subjective Symptoms of Temporomandibular Disorders in Instrumentalists

PURPOSE: Most of the reports on instrumentalists' experiences of temporomandibular disorders (TMD) have been reported not by clinical examinations but by subjective questionnaires. The aim of this study was to investigate the clinical signs and subjective symptoms of TMD in a large number of instrumentalists objectively. MATERIALS AND METHODS: A total of 739 musicians from a diverse range of instrument groups completed a TMD questionnaire. Among those who reported at least one symptom of TMD, 71 volunteers underwent clinical examinations and radiography for diag-nosis. RESULTS: Overall, 453 participants (61.3%) reported having one or more symptoms of TMD. The most frequently reported symptom was a clicking or popping sound, followed by temporomandibular joint (TMJ) pain, muscle pain, crepitus, and mouth opening limitations. Compared with lower-string instrumentalists, a clicking or popping sound was about 1.8 and 2 times more frequent in woodwind and brass instrumentalists, respectively. TMJ pain was about 3.2, 2.8, and 3.2 times more frequent in upper-string, woodwind, and brass instrumentalists, respectively. Muscle pain was about 1.5 times more frequent in instrumentalists with an elevated arm position than in those with a neutral arm position. The most frequent diagnosis was myalgia or myofascial pain (MFP), followed by disc displacement with reduction. Myalgia or MFP was 4.6 times more frequent in those practicing for no less than 3.5 hours daily than in those practicing for less than 3.5 hours. CONCLUSION: The results indicate that playing instruments can play a contributory role in the development of TMD.

Salivary cortisol response to electrical stimulation in TMD cases and its relation with pain catastrophizing / 实用口腔医学杂志

Objective:To analyse the salivary cortisol changes in patients with temporomandibular disorders(TMD)after electrical stimulation,and the relationship between cortisol and pain catastrophizing.Methods:1 1 TMD and 1 1 healthy subjects were evoked by electrical stimulation.The saliva samples were collested before test,50 s and 1 00 s of stimulation after test seperately.Salivary cortisol was analysed by ELISA kit.The pain catastrophizing scale(PCS)was answered by all the subjects before stimulation.Data were statis-tically analysed.Results:The salivary cortisol concentration in TMD patients was higher than that in the controls(P <0.05).After stimulation,it showed a downward trend.No interaction between time and groups.The total scores of PCS including three indexes(ru-mination,magnification,helpless)were positively correlated with salivary cortisol concentration.Conclusion:The unpredictable stress causes high level of cortisol.which is related to pain catastrophizing.

Evaluación de la oclusión en pacientes con trastornos temporomandibulares y desarmonías oclusales / Occlusion assessment in patients with temporomandibular disorders and occlusal disharmony

Se realizó un estudio para identificar relación que existe entre los trastornos temporomandibulares y las desarmonías oclusales. Se estudiaron 40 pacientes de ambos sexos, con edades comprendidas entre 18 y 45 años, que solicitaron atención en el Servicio de Trastornos Temporomandibulares, del Departamento de Prótesis de la Facultad de Estomatología, que cumplieron los requisitos expresados para este estudio y refirieron signos y síntomas de trastornos temporomandibulares. Se analizó el comportamiento de las interferencias oclusales a los movimientos mandibulares. Se analizaron las interferencias oclusales a dichos movimientos en los modelos de estudios, montados en un articulador semiajustable. Los resultados obtenidos reflejaron un predominio en las interferencias oclusales, en los pacientes analizados con trastornos temporomandibulares. El mayor porcentaje de interferencias se encontró durante el movimiento propulsivo. Las interferencias fueron más frecuentes en el lado de no trabajo para los movimientos analizados y el grupo de molares resultó ser el más afectado, tanto para los movimientos de propulsión como de lateralidad(AU)

A study was conducted to identify the direct relation among the temporomandibular disorders and occlusal disharmonies, which always has been an attention matter by all Stomatology fields. Forty patients of both sexes were studied aged between 18 and 45 seeking care in the temporomandibular disorders service of Prosthesis Department from the Stomatology Faculty who fulfilled the expressed requirements for this type of study and presenting with signs and symptoms of temporomandibular disorders, thus we analyzed the occlusal interferences behavior to mandibular movements in study models, mounted in a semiadjustable articulator. Results obtained demonstrated predominance in occlusal interferences in study patients with temporomandibular disorders; the greater percentage of interferences was found during the propulsion movement which were more frequent in the non functional side for analyzed movements and molars were the more affected ones for propulsion movement and for laterality(AU)

Effect of acupuncture treatment on temporomandibular disorders-Questionnaire and acupuncture treatment for university students- / 全日本鍼灸学会雑誌

[Purpose]The reason is uncertain though it is assumed that to young people that there are a lot of Temporomandibular disorders (TMD). Then, the questionnaire survey concerning the mandible function was administered for university students, and the clinical trial of the acupuncture treatment that used sham acupuncture for the one where the problem was seen in the mandible function was tried.<BR>[Method]We questioned students at Meiji University of Integrative Medicine by answer selection type concerning the mandible function. The acupuncture treatment was done on 16 students (21.5 ± 1.7 years old;mean ±S.D.) who had problems in the mandible function. The group was divided into two groups (the acupuncture group and the sham acupuncture group) at random. Each group received five acupuncture treatment sessions several times week in total. Outcome measures were pain intensity (visual analogue scale) and function of jaw (mouth opening and muscle power). Each evaluation was assumed to be done before beginning the treatment, and the effect of treatment was assumed to be the one evaluated as a therapeutic gain after one week.<BR>[Result]University students who had some problem in the mandible function were 50%or more of the whole, and a lot of problems were joint noises. On the other hand, the acupuncture group was 67.1 ± 19.1 mm and the sham group was 65.6 ± 15.2 mm. Both groups showed reduction tendencies as the acupuncture group was 9.3± 7.8 mm and the sham group was 40.5 ± 16.7 mm. The acupuncture group reported less pain intensity than the sham acupuncture group (p = 0.0152, Mann-Whitney). However, the true and sham acupuncture groups did not change the function of the jaw. <BR>[Conclusion]A lot of university students who had mandible function problems were unexpectedly regarded as necessary to treat at the early stage. On the other hand, these results suggest that true acupuncture procedures may be more effective on TMD in young patients than sham acupuncture procedures.