The purposes of this study were to assess the prevalence of temporomandibular disorders symptoms and signs and the bite force in pediatric patients with idiopathic musculoskeletal pain syndrome and to compare to healthy control individuals paired by gender and age.
Forty consecutive patients (32 girls) from our outpatient pediatric rheumatology pain clinic with diagnosis of idiopathic musculoskeletal pain syndrome were included in this study. Twenty healthy subjects (16 girls) were considered the control group. All individuals were interviewed according to a standardized questionnaire concerning the presence of orofacial pain and functional impairment, and were submitted to a clinical evaluation following a structured protocol. After that the bite force was measured.
Twelve patients met the ACR criteria for fibromyalgia, and 28 presented the diagnosis of pain amplification syndrome. The mean age of patients was 13.1 years (range, 6-18 years) and of controls was 12.8 years (range, 6-18 years) with no significant difference. Orofacial symptoms occurred in 25 patients (62.5%) and in 3 controls (15%) (p = 0.0014). Sixteen (40%) patients and four (20%) controls presented pain during mandibular function with no significant difference. Although both pain groups presented separately more frequently orofacial symptoms and pain on palpation than the controls, maximal voluntary bite force was similar between patients and controls, between both patient groups and between the two pain groups and controls.
Our findings indicate that temporomandibular disorders symptoms were more prevalent in patients with idiopathic musculoskeletal pain syndrome than in healthy controls. However the bite force was not different among the groups.