Abstract
BackgroundTemporomandibular pain disorder (TMD) is a common pain condition in the face. People with TMD report multiple pain comorbidities. The presence of fibromyalgia and migraine in people with TMD is associated with an increase in TMD pain intensity and duration. However, data on the relationship between increasing number of pain comorbidities and TMD pain are rare. The aims of this study were: firstly to evaluate the extent to which increasing number of comorbidities is associated with increasing TMD pain intensity and duration; and secondly to evaluate the extent to which the presence of specific comorbidities is associated with increasing TMD pain intensity and duration.MethodsThe sample included 180 people seeking TMD treatment at Boston and Montreal clinics. TMD was diagnosed using the Research Diagnostic Criteria for TMD. A Numerical Pain Rating Scale assessed TMD pain intensity and participants provided their TMD pain duration in a study questionnaire. The comorbidities of migraine, chronic fatigue syndrome, irritable bowel syndrome, interstitial cystitis and restless leg syndrome were diagnosed by 5 validated diagnostic questionnaires. The associations were analyzed by linear regression, controlling for confounders.ResultsThere was a positive association between the number of comorbidities present and TMD pain intensity (p < 0.01) and between the number of comorbidities present and TMD pain duration (p < 0.01). Also, the presence of migraine was positively associated with TMD pain intensity (p < 0.01) and the presence of chronic fatigue syndrome was positively associated with TMD pain intensity (p < 0.05) and with TMD pain duration (p < 0.01). When TMD patients were separated into groups, these associations did not change for the myofascial pain group, whereas in the non-myofascial pain group, the relationship between number of comorbidities and TMD pain duration was the only one still present.ConclusionThis study shows that the number of comorbidities is positively associated with TMD pain duration and intensity. The presence of specific conditions, such as migraine and chronic fatigue syndrome, is associated with an increase in TMD intensity and duration.
Highlights
Temporomandibular pain disorder (TMD) is a common pain condition in the face
A total of 224 participants agreed to partake in the study, of which 209 participants were from the Massachusetts
Our analyses demonstrated a positive association between the number of comorbidities and TMD pain intensity in a dose–response fashion (Fig. 1)
Summary
Temporomandibular pain disorder (TMD) is a common pain condition in the face. The presence of fibromyalgia and migraine in people with TMD is associated with an increase in TMD pain intensity and duration. Data on the relationship between increasing number of pain comorbidities and TMD pain are rare. Temporomandibular pain disorder (TMD) is a common pain condition in the face, with a prevalence of 5–33 % [1, 2]. The presence of widespread pain is associated with onset and increase of TMD pain intensity, duration, and disability [6,7,8,9,10]. Data on the relationship between TMD pain and multiple pain comorbidities that are not widespread is rare [11]. Additional research is necessary to understand the relationship between multiple comorbidities and TMD pain intensity and duration
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