comparing the effects of Laser therapy with anterior re-positioning splint and a placebo group on clinical signs and symptoms of temporo-mandibular dis-function and assessing articular disc morphology and configuration with magnetic resonance imaging.

to compare the clinical effects of Laser therapy as assessed with research diagnostic criteria of temporo-mandibular disorders to a group that received anterior re-positioning splint therapy and a control group that received placebo Laser. Diagnosis for disc displacement with reduction was performed with magnetic resonance imaging before treatment. assessment of the clinical and MRI findings was again performed after a 3 months observation period.

Inclusion Criteria:

1. Patients having TMD in the form of disc displacement with reduction as verified from signs and symptoms during clinical examination and confirmed from the MRI.
2. Good general health: The patient must be medically free from any systemic disease or health problems.
3. Adult patients 18 years old and above.
4. No previous orthodontic treatment.
5. No previous TMJ treatment or surgery.

Exclusion Criteria:

1. Patients with multiple missing posterior teeth.
2. Muscle pain due to systemic disease.
3. Dental related pain.
4. Congenital abnormality, neoplasia or acute trauma.
5. Previous TMJ treatment or surgery.
6. Any medical condition that prohibits MRI acquisition.