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Risk Factors for Diagnostic Subgroups of Painful Temporomandibular Disorders (TMD)

¹ Department of Orthodontics, Box 357446,
² Department of Oral Medicine,
³ Department of Epidemiology, and
⁴ Department of Dental Public Health Sciences, University of Washington, Seattle, WA 98195-7446;

*corresponding author, ghuang{at}u.washington.edu

Temporomandibular Disorders (TMD) encompass several entities, which may have differing etiologies. To test this hypothesis, we investigated risk factors for three diagnostic subgroups of painful TMD. Ninety-seven subjects with myofascial pain only, 20 with arthralgia only, 157 with both myofascial pain and arthralgia, and 195 controls without TMD pain met criteria for study eligibility. Investigated risk factors included both physical and psychological variables. Adjusted odds ratios were calculated by multiple logistic regression analyses. Myofascial pain occurring alone was significantly associated with trauma (Odds Ratio {OR} = 2.0), clenching (OR = 4.8), third molar removal (OR = 3.2), somatization (OR = 3.7), and female gender (OR = 4.2). Myofascial pain with arthralgia was significantly associated with trauma (OR = 2.1), clenching (OR = 3.3), third molar removal (OR = 4.0), somatization (OR = 5.1), and female gender (OR = 4.7). No significant associations were found for the small-arthralgia-only group.

KEY WORDS: TMD • risk factors • temporomandibular disorders • subgroups

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