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Incidence and prevalence of myofascial pain in the jaw-face region: a one-year prospective study on dental students
Umeå University, Faculty of Medicine, Odontology, Clinical Oral Physiology.
Umeå University, Faculty of Medicine, Odontology, Clinical Oral Physiology.
2008 (English)In: Acta Odontologica Scandinavica, ISSN 0001-6357, Vol. 66, no 2, 113-121 p.Article in journal (Refereed) Published
Abstract [en]

Objective. The aims of this study were to examine the 1-year period prevalence, incidence, and course of myofascial pain in the jaw-face region, and to analyze whether female gender, dental occlusion, and oral parafunctions have any influence on these signs and symptoms. Material aad methods. The study population comprised 308 dental students examined at the start of their dentistry course and re-examined after 1 year. Case histories were collected using a questionnaire. The clinical examination included palpation sites of muscles, a submaximal clenching test, measurements of maximal mandibular mobility, and classification of morphological and functional dental occlusion. Results. The 1-year period prevalence of frequent myofascial symptoms was 19%. The incidence of myofascial pain, according to the Research Diagnostic Criteria for TemporoMandibular Disorders (RDC/TMD), was 4%. The female students presented an almost 4-fold incidence rate of myofascial symptoms compared to the male students. Non-symptomatic subjects were found among those without awareness of bruxism and with simultanious bilateral contact in the retruded contact position (RCP), and among those with a stable intercuspal position (ICP). Variations in morphological occlusion did not show any relation to myofascial symptoms, nor did contact patterns in eccentric positions. Conclusions. Female dental students were more prone to developing frequent myofascial pain and to perceiving local muscle soreness than were male students during a 1-year period. Both self-reported bruxism and registered mandibular instability in ICP showed association with the 1-year period prevalence of myofascial signs and symptoms in the jaw-face region.

Place, publisher, year, edition, pages
2008. Vol. 66, no 2, 113-121 p.
Keyword [en]
Dental occlusion, longitudinal study, masticatory, risk factors, temporomandibular disorders
URN: urn:nbn:se:umu:diva-10987DOI: 10.1080/00016350802010372OAI: diva2:150658
Available from: 2008-11-10 Created: 2008-11-10 Last updated: 2009-12-01Bibliographically approved
In thesis
1. Temporomandibular disorders: incidence, course, and risk factors
Open this publication in new window or tab >>Temporomandibular disorders: incidence, course, and risk factors
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Käkfunktionsstörning : förlopp och riskfaktorer
Abstract [en]

Temporomandibular disorders (TMD) embrace pain and dysfunction in the temporomandibular joint (TMJ) and jaw muscles. TMD is a prevalent condition in the population and constitutes a significant health problem. Knowledge of factors influencing the onset and course of TMD is important in preventive care and development of treatment strategies as well as in clinical decision making. The aim of this thesis was to gain knowledge of whether variations in dental occlusion, bruxism, spinal pain and gender predicted the development and course of TMD.

The study population comprised 371 undergraduate dental students. A questionnaire was used to obtain case histories. Clinical examination included the function of the TMJ, jaw muscles, maximal jaw mobility, the morphological occlusion, and contact patterns in centric and eccentric positions. The examinations were performed at start, and after 12 and 24 months. In total, 280 subjects were examined at all three occasions.

The incidence of TMJ pain and dysfunction was high among both males and females. The course composed onset, recovery and maintenance resulting in a fluctuating pattern. Females were more likely to have persistent TMJ pain and dysfunction than males. The incidence and persistence of jaw muscle signs and symptoms was high and significantly more common in females. A similar fluctuating pattern as for TMJ pain and dysfunction was found. Crossbite predicted onset and persistence of TMJ pain and dysfunction; mandibular instability in centric positions predicted persistent TMJ pain and dysfunction, as well as persistent jaw muscle signs or symptoms. Reported bruxism increased the risk for TMJ pain and dysfunction but did not significantly affect the course of jaw muscle signs and symptoms. Spinal pain at baseline predicted the onset of jaw pain, headaches, and TMD pain. Signs of TMD at baseline predicted the onset of non-pain symptoms of TMD, jaw pain, headaches, and spinal pain.

In conclusion, the results in this thesis show high incidence rates for TMD, headaches, and spinal pain among dental students. Crossbite, mandibular instability, reported bruxism, as well as female gender were identified as contributing risk factors. Spinal pain and TMD mutually predicted each other, indicating common pathophysiological mechanisms and individual vulnerability. The findings support a multidisciplinary approach, and it is recommended that the status and function of the jaw system be considered in patients with spinal pain.

Place, publisher, year, edition, pages
Umeå: , 2009. 68 p.
Umeå University odontological dissertations, ISSN 0345-7532 ; 108
bruxism, dental occlusion, gender, headaches, longitudinal, myofascial pain, orofacial pain, prospective cohort, risk factors, spinal pain, temporomandibular joint
National Category
urn:nbn:se:umu:diva-25689 (URN)978-91-7264-832-6 (ISBN)
Klinisk oral fysiologi, 901 87, Umeå
Public defence
2009-09-25, Sal B, By 1D, 9tr, Tandläkarhögskolan, Umeå, 09:00 (Swedish)
Available from: 2009-09-07 Created: 2009-08-28 Last updated: 2009-12-15Bibliographically approved

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