Physical activity level and temporomandibular disorders in South Koreans.

OBJECTIVE: This study aimed to investigate the association between general physical activity level and TMD pain in Koreans in a large-scale national database established through a nationwide survey. METHODS: Data from the Fourth Korean National Health and Nutrition Examination Survey (KNHANES IV), which was conducted from 2007 to 2009, were analysed. In total, 16 941 participants were included in this cross-sectional study. Data on sociodemographic characteristics, TMD-related variables, and general physical activity level were collected. Participants were divided into moderate- and low-intensity exercise groups according to their physical activity levels. Multivariate logistic regression analyses were performed, adjusting for sociodemographic and other covariates. RESULTS: The adjusted odds ratio (OR) (95% confidence interval; CI) for TMD pain was 1.373 (1.017-1.854) for people doing moderate-intensity exercises and 0.797 (0.629-1.008) among people doing low-intensity exercises. Those who did moderate-intensity exercises had significantly more TMD pain. This was higher in the 30- to 39-year age group (OR: 1.991, 95% CI: 1.137-3.488), with significantly higher risk for TMD pain in those who did moderate-intensity exercise, whereas low-intensity exercise significantly decreased the risk for TMD pain in the same age group (OR: 0.625, 95% CI: 0.409-0.958). CONCLUSIONS: Moderate-intensity physical activity is associated with more TMD pain. Patients with TMD should avoid high-intensity level exercises and continue low-intensity exercises to prevent pain aggravation.

Clinical implications of magnetic resonance imaging in temporomandibular disorders patients presenting ear fullness.

OBJECTIVES/HYPOTHESIS: The aim of this study was to investigate whether findings detected by temporomandibular joint magnetic resonance imaging (TMJ-MRI) can provide pathognomonic evidence of temporomandibular disorders (TMD) in patients with nonspecific ear fullness (EF). The association of nonspecific EF with clinical characteristics of TMD based on TMJ-MRI findings was examined. STUDY DESIGN: Retrospective analysis. METHODS: Thirty-four subjects (42 ears) who had no detectable otologic problems as a cause of EF were enrolled in this study. Each subject underwent TMJ-MRI to identify pathology of the TMJ as a possible cause of nonspecific EF. All subjects participated in the re-evaluation process following TMD treatment. RESULTS: Anatomical abnormalities in TMJ-MRI, irrespective of TMD signs, were observed in 34 of the 42 ears (80.9%), such as degenerative change of the TMJ (16 ears), articular disc displacement (11 ears), and joint effusion (seven ears). Specific abnormalities of the TMJ were associated with nonspecific EF, and this symptom showed improvement following individualized TMD treatment in those with internal derangement and/or effusion of the TMJ. However, abnormal TMJ-MRI findings were also observed in seven of nine ears with no TMD signs, and there was no significant association between the presence of TMD signs and abnormal TMJ-MRI findings (χ2 = 0.075, P = .784). CONCLUSIONS: Patients presenting with nonspecific EF may have TMD, which can be effectively diagnosed using TMJ-MRI. The present study revealed the causal relationship between nonspecific EF and abnormal TMJ findings based on MRI. Individualized TMD treatments based on TMJ-MRI led to improved treatment outcomes with special regard to nonspecific EF LEVEL OF EVIDENCE: 4. Laryngoscope, 128:1692-1698, 2018.