A 42-year-old patient complains of pain in the right side of her head, restricted movements of the lower jaw, clicking sound, periodic spasms of chewing muscles. Objectively: the face is symmetric, mouth opening is restricted. On palpation of the right temporo-mandibular joint (TMJ) there are crepitation and clicking that accompany the mandible movements. Examination of the oral cavity revealed also a Kennedy's class II defect on the right. What is the most likely diagnosis?