Myofascial pain dysfunction syndrome (MPDS) is the most common reason for pain and limited function of the masticatory system. The low-level laser therapy (LLLT) and occlusal splint therapy (OST) are therapeutic options for MPDS. This study aims to evaluate the effect of LLLT and OST on pain relief and mandibular movement improvement in patients with myofascial pain.

Myofascial pain dysfunction syndrome in the masticatory muscles is the most common temporomandibular disorder. Patients suffer from pain and muscle tenderness and may present with or without restricted mouth opening. The etiology of myofascial pain dysfunction syndrome is multifactorial including psychological factors, occlusion imbalance, and parafunctional habits. Treatments for myofascial pain dysfunction syndrome include education, self-care, physical therapy, use of intra-oral appliances, short-term pharmacotherapy, behavioral therapy, and relaxation techniques.

Temporomandibular disorder is most often treated using occlusal splints safely to reduce temporomandibular joint load, and subsequently, clinical symptoms, as a reversible therapy. Occlusal splints need to be used for at least three months to eliminate temporomandibular disorders.

One of physical therapy is laser treatment. Laser treatment on tissues provides a clinical effect called biostimulation, where the basic mechanism occurs at the molecular level.

The low-level laser has non-invasive and inoffensive characteristics at appropriate parameters.

Inclusion Criteria:

• Diagnosis of myofascial pain syndrome according to The Research Diagnostic Criteria for Temporomandibular Disorder.
• Individuals between the ages of 18-60
• Occlusion of individuals with posterior teeth
• Forms of individuals who do not have any systemic disease

Exclusion Criteria:

• Disc displacement with or without reduction, with or without limited mouth opening, arthralgia, arthritis, arthrosis
• Inflammatory connective tissue disease (such as rheumatoid arthritis)
• Psychiatric diseases
• Tumor
• Heart diseases
• Pregnancy
• Diseases that may cause pain symptoms in other orofacial regions (toothache, neuralgia, migraine)
• Having received any treatment for headache or bruxism in the last 2 years
• Skin infections on the masseter and temporal muscles

Thracian region