Pain Neuroscience Education, Motor Imagery and Action Observation in Patients With Chronic Temporomandibular Disorders.

OS will be made of heat-cured acrylic by the same specialized dentist. These intraoral devices will be flate, rigid, will cover the entire dental arch, and will have the lowest possible height. The perimeter of the splint will have at least 11 dental contacts, light, symmetrical and pinpoint as possible. The patients will be instructed to use the splint every night during the study Two supervisions will be carried out 30 and 60 days after the use of the OS, in order to stabilize the contact points.

"A power point presentation with metaphors and animated videos will be used. The PNE will be held in 10 sessions of 20 minutes each. The intervention will be developed using content according to the book Explain Pain and the web page www.retrainpain.org."

"The participants will have to judge the laterality of different cervical images presented on the screen of a cell phone. The laterality task will be executed using an application called Recognize Neck, developed by the NOI group. The procedure will begin with a familiarization test with the Basic level followed by a laterality discrimination task. It will be performed using 20 images, with 5 seconds for each image, beginning with the Vanilla program and progressively increasing the difficulty using the Context and Abstract programs. The estimated time to complete the task will be about 10 minutes per session."

The patients will see videos showing the jaw and cervical exercises with the same series and repetitions that they will actively perform in the session. Therefore, the training of the action observation will be carried out dynamically. The patient will be asked to think and visualize the movement that he/she will have to perform later. It is estimated 10 minutes per session for the AO.

A jaw and neck exercise program will be carried out in 3 series of 10 repetitions per session will be planned with 1minute rest between exercise. The exercises will be executed with a total time per session of 20 minutes, initially in the clinic and later at home. In the clinic, verbal and tactile instructions will be provided for the correct execution of the exercises and later they will be sent through WhatsApp and / or mail to perform them at home.

Counselling include education about the anatomical, biomechanical and psychosocial factors relationed with temporomandibular disorders, guidance regarding the parafunction jaw activities for eg will be taught the resting postural position of the mandible (teeth apart, lips slightly touching and tongue not pushing against the teeth).