Stabilization splint therapy and Low-level laser therapy may serve as non-invasive intervention for painful temporomandibular disorders, but its efficacy is still debated. This study compared the effect of stabilization splint and low-level laser therapy alone or in combination in patients with painful chronic closed lock of temporomandibular joints disc displacement without Reduction 42 patients diagnosed with chronic closed lock of disc displacement without reduction were allocated equally and randomly into three treatment groups: group I received combined stabilization splint and low- level laser therapy, group II received low - level laser therapy and group III received stabilization splint. They were evaluated at baseline and one week, two weeks, four weeks, three months, and six months after the intervention.

Objectives: Stabilization splint therapy and low- level laser therapy may serve as non-invasive intervention for painful temporomandibular disorders, but its efficacy is still debated. This study compared the effect of stabilization splint and low- level laser therapy alone or in combination in patients with painful chronic closed lock of temporomandibular joints disc displacement without Reduction.

Patients and methods: 42 patients diagnosed with chronic closed lock of disc displacement without reduction were allocated equally and randomly into three treatment groups: group I received combined stabilization splint and low-level laser therapy, group II received low-level laser therapy and group III received stabilization splint. They were evaluated at baseline and one week, two weeks, four weeks, three months, and six months after the intervention. Time of being normal was also evaluated.

Inclusion Criteria:

• Clinical diagnosis of chronic closed lock patients
• Must not be able to open their mouth

Exclusion Criteria:

• neurologic diseases
• TMJ pathologic lesions