PubMed · 6942547
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Z Stosić. [Masticatory dysfunction caused by occlusal disharmony].. https://pubmed.ncbi.nlm.nih.gov/6942547/
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To test the hypothesis that a flat plane interocclusal appliance affects the electromyographic (EMG) activity of the temporalis and masseter muscles in pain-free individuals, maxillary splints were fabricated for 20 individuals who reported no history, signs or symptoms of myofascial pain or arthralgia as determined by two trained, independent examiners. Subjects were instructed to establish light tooth contact, maximum clenching, and moderate clenching with/without the splint in place (as determined by random assignment) while EMG data from the left and right temporalis and masseter muscles were recorded. A 5-min biofeedback training session to relax the masticatory muscles was followed by a repetition of the tooth contact/clenching tasks with/without the splint in place. With the splint in place, the activity of the temporalis muscles decreased for all tasks, significantly for the left and right temporalis under maximal clenching and for the right temporalis under moderate clenching. In contrast, the activity of the masseter muscles increased under light and moderate clenching (significantly for the left masseter under moderate clenching) and decreased slightly under maximal clenching. The effectiveness of interocclusal appliances may be due to mechanisms other than redistribution of adverse loading.
AIMS: To investigate, by means of a mail questionnaire, the prevalence of symptoms related to temporomandibular disorders (TMD) in 50-year-old subjects living in the counties of Orebro and Ostergötland, Sweden. METHODS: The total population comprised 8,888 individuals, and the overall response rate was 71%. A clinical evaluation of the masticatory system was performed in subgroups to validate the responses to the questionnaire. There was satisfactory correspondence between self-reports and well-defined clinical conditions. RESULTS: Women reported, more often than men, pain from the temporomandibular joints (TMJs), TMJ sounds, bruxism, sensitive teeth, and burning mouth symptoms. The prevalences of difficulties in jaw opening, loss of anterior teeth due to trauma, and masticatory problems were greater in men than in women. No gender difference was found in the number of remaining teeth. Logistic regression analysis with pain from the TMJ as the dependent variable identified bruxism, impaired chewing efficiency, and gender (women) as the most significant risk factors. With reduced chewing ability as the dependent variable, several missing teeth constituted the highest risk, followed by pain from the TMJ, bruxism, gender (men), and loss of anterior teeth due to trauma. CONCLUSION: There were significant gender differences in reported TMD-related symptoms in 50-year-old Swedes. Bruxism was a significant risk factor for pain from the TMJ. Reduced number of teeth and pain from the TMJ were significant risk factors for impaired chewing ability.