Turkish Journal of Physical Medicine and Rehabilitation 2011 , Vol 57 , Num 1

Masticatory Muscle Pain and Low-Level Laser Therapy: A Double-Blind and Placebo-Controlled Study

Bilge Gökçen Röhlig 1 ,Selin Kıpırdı 1 ,Uğur Meriç 2 ,Nalan Çapan 3 ,Haluk Keskin 4
1 Istanbul Üniversitesi, Diş Hekimliği Fakültesi, Çene Hastalıkları Protetik Bölümü, Istanbul, Türkiye
2 Istanbul Üniversitesi, Diş Hekimliği Fakültesi, Ağız Diş Çene Hastalıkları ve Cerrahisi Anabilim Dalı, Istanbul, Türkiye
3 İstanbul Üniversitesi İstanbul Tıp Fakültesi, Fiziksel Tıp ve Rehabilitasyon Anabilim Dalı, İstanbul, Türkiye
4 İstanbul Üniversitesi Diş Hekimliği Fakültesi, Protetik Diş Tedavisi Anabilim Dalı, Çene-Yüz Protezi Bilim Dalı, İstanbul, Türkiye
DOI : 10.4274/tftr.57.06

Objective: This study was designed to evaluate the efficacy of low-level laser therapy (LLLT) in patients with chronic orofacial pain of muscular origin.


Materials and Methods: A sample of 40 patients with temporomandibular disorders (TMD) of muscular origin was randomly divided on the basis of the treatment applied: laser group versus placebo group. A continuous low-intensity semiconductor laser device with an output of 300 mW, emitting radiation with a wavelength of 820 nm and having energy density of 8 J/cm2 was used. Laser irradiation was applied to the muscles of mastication every other day for three weeks for a total of ten sessions. Mandibular mobility was examined, masticatory muscles tenderness was assessed, pressure pain threshold (PPT) values and visual analog scale (VAS) scores were obtained.


Results: A repeated measurement one-way ANOVA demonstrated significant differences between the laser and placebo groups. In the laser group, there was a statically significant reduction in PPT values and in the number of muscles with pain on palpation (p<0.05). Mandibular movements improved significantly (p<0.05) The placebo group demonstrated slight improvement, but it was not statistically significant.


Conclusion: This particular type of LLLT can be an alternative modality in the treatment of TMD in cases of myogenic origin. 

Keywords : Low-level laser, pressure pain threshold, temporomandibular disorders, pai