Hamed Mortazavi - Assistant,Faculty of dentistry, Hamadan, Iran
Abbas Javadzadeh - Associate,Faculty of dentistry, Hamadan, Iran
Zahra Delavarian - Assistant,Oral Pathology
Zare Mahmoodabadi - School of Dentistry, Mashhad University of Medical Sciences

Introduction: Painful dysfunction syndrome of masticatory muscles is one of the most important causes of pain in orofacial region. Therefore, the aim of this study was to evaluate the prevalency of ۴۰ variables related to this disorder. Materials and Methods: A total ۳۹ patients (۳۲ females, ۷ males) with painful dysfunction syndrome of masticatory muscles were studied. Patients were evaluated for prevalence of age, sex, job, marriage status, masticatory muscles tenderness, maximum mouth opening, deviation, deflection, temporomandibular joint involvement, habits, parafunctions, mall occlusions, neck pain, headache, ear pain and previous history of jaw involvement. Results:  Mean age of patients was ۳۵±۱۳.۳۲ years old and most common range of age was  ۲۰-۴۰, ۵۱% were house wife and ۷۴.۴% were married. Other variables included: Clicking (۷۴.۴%), temporomandibular joint pain (۵۴%), headache (۴۶.۲%), ear pain (۴۱%), neck pain (۳۵.۹%), limitation of maximum opening (۷۱.۸%), class I mall occlusion (۷۴.۴%), cross bite and deep bite (۲۵.۶%), deviation (۷.۷%), deflection (۴۱%), bruxism (۵۶.۴%), clenching (۶۴.۱%) Masseter and external petrygoid (۸۵%) muscles of masticatoty muscles had higher involvement. Conclusion: Because of painful dysfunction syndrome of masticatory muscles has variable signs and symptoms, diagnosis and treatment planning may be very difficult, Therefore having more information about this disorder can help physicians to make best decisions.

Masticatory muscles, Painful dysfunction syndrome, patient