Laser Therapy on TMJ Disorders After Head and Neck Cancer.

patients will receive Nd: YAG with wavelength 1064 nm, peak power 3KW, energy density 360-1780 mJ/cm2, a short duration 120-150 micro sec, a mean power 10.5 W, a low frequency 10-40 HZ, a duty cycle of 0.1%, a probe diameter of 0.5 cm and spot size of 0.2 cm2. The treatment will be applied into 3 phases in each session. In addition to the traditional physical therapy exercise program (passive and active ROM exercises, stretching and strengthening exercises) for 20 minutes, total session time is 35 minutes, 3 days/ week for 4 weeks.

passive and active ROM exercises, stretching and strengthening exercises for 35 minutes, 3 days/ week for 4 weeks.

patients will receive placebo HILT including the same treatment as in group A but the laser device will be turned off.