Objective To compare the effects of low intensity ultrasound (LIUS), traditional exercise therapy (TET), low level laser therapy (LLLT) and TET on temporomandibular joint (TMJ) pain and trismus following recovery from head and neck cancer (HNC).
Methods Sixty participants following, who had experienced HNC, were randomly allocated to three groups of 20 people each. Each group received different therapy. Group A received LIUS and TET; group B received LLLT and TET; while group C received TET. All 60 participants were evaluated under the visual analog scale (VAS), the University of Washington Quality of Life questionnaire (UW-QOL) and the Vernier caliper scale (VCS) at the beginning of the therapies and after 4 weeks.
Results ANOVA test revealed significant improvements across all three groups with outcomes of p<0.05. The results of the UW-QOL questionnaire showed a significant difference between groups A, B and C in favor of group A (p<0.05). The VAS results showed a more improvement in group A as compared to group B (p<0.05), while there was no statistical difference between groups B and C (p>0.05). The VCS results showed more improvement for the individuals in group B as compared to those in group C (p<0.05), while there was minimal difference between groups A and B (p>0.05).
Conclusion The LIUS and TET are more effective than LLLT and/or TET in reducing TMJ pain and trismus following HNC.
Citations
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Objective This study was performed to investigate the effects of low-level laser irradiation on the dorsal horn cell activities in the rats with experimental muscle pain. Method: Experimental muscle pain was induced by repeated injections of acidic saline into the gastrocnemius muscle in thirty Sprague-Dawley rats. Activities of ipsilateral dorsal horn cells were recorded with a glass microelectrode at L2-L4 spinal cord level before and after low-level laser irradiation on the injected leg. Cells were categorized as wide dynamic range (WDR) and high threshold (HT) cells by the response to the cotton, vonFrey filament, and forceps stimulation at the receptive area.Results: The spontaneous and mechanically evoked activities of WDR and HT cells were significantly increased in the muscle pain models. Low-level laser irradiation reduced mechanically evoked activities of WDR and HT cells. This effect was maximal at 20 minutes after irradiation and then returned to pre-treatment level in 40∼50 minutes. Conclusion: The low-level laser irradiation was effective for the management of muscle pain by reducing activities of dorsal horn cells. Low-level laser might be clinically used for the treatment of local and referred pain of muscle origin. (J Korean Acad Rehab Med 2005; 29: 513-520)
Objective We examined the effect of low power laser irradiation (LPLI) on the proliferation and differentiation of PC12 nerve cells. Method: After seeding 4⁓105 PC12 nerve cells each in the 24 well-culture dishes, we cultured them for 6 days with RPMI1640 media. LPLI (650 nm, 5 mW, 5 sec) was applied for 1 day, 2 days and 3 days (1, 2 and 3-day-LPLI groups) consecutively. For the degree of proliferation of PC12 nerve cells, we compared the total cell number at 6th day after LPLI by MTT cell proliferation assay. For the degree of differentiation, we compared the length of neurite out- growth and the expression of RT97 at 6th day after adding nerve growth factor on each group. Results: The total cell numbers were increased significantly after LPLI, but those increments were not significant among 1, 2, and 3-day-LPLI groups. The numbers of the differentiated PC12 nerve cells and the expressions of RT97 were diminished serially according to the number of days of LPLI. Conclusion: We conclude that LPLI increased the proliferation and decreased the differentiation of PC12 nerve cells. We could suggest that single or short-term use of LPLI on the injured nerve should be helpful for enhancing the neural regeneration in vivo. (J Korean Acad Rehab Med 2005; 29: 419-423)
Objective This study was designed to investigate the mechanism of the primary afferent input to spread of contralateral hyperalgesia in the persistent muscle pain model in the rat.Method: Muscle pain was induced by twice repeated intramuscular injections of pH 6.0 buffered saline into the unilateral gastrocnemius muscle of the rats. Change of mechanical withdrawal threshold to von-Frey filament was measured after ipsilateral laser irradiation, anesthetic blockade with lidocaine and dorsal rhizotomy (L2∼L6) to reduce primary afferent input from the tissue injury. Results: Bilateral persistent mechanical hyperalgesia in the hind paw was evoked after second injection. Ipsilateral laser irradiation, lidocaine injection and dorsal rhizotomy had no effect on the contralateral spread of mechanical hyperalgesia.Conclusion: These results suggest that contralateral hyperalgesia was produced by, but didn't need to be maintained by inputs from an injury. Therefore, central nervous systems are responsible for the contralateral spread of hyperalgesia. (J Korean Acad Rehab Med 2004; 28: 477-482)
Objective To verify the effect of low energy laser irradiation (LELI) on the regeneration of injured sciatic nerve of the rat by showing the functional improvement and the elevated immunoreactivities (IRs) of growth-associated protein 43 (GAP-43). Method: Twenty rats, which had standardized compression injuries to the sciatic nerves, received the calculated LELI therapy immediately after the nerve injury and four consecutive days. The functional status was evaluated by sciatic functional index (SFI), and GAP-43-IRs was evaluated by immunohistochemistry and RT-PCR. Results: The SFI was recovered in LELI rats faster than in the control group. Although expression of GAP-43 in the injured sciatic nerve was increased both in the LELI and control groups, the intensities of GAP-43-IRs were much greater in LELI treated group at 1 and 3 weeks after nerve injury. Both SFI and GAP-43-IRs reached the same level at 5 weeks after the nerve injury. Conclusion: LELI enhanced the neural regeneration after experimentally induced sciatic nerve injury at the early stage of recovery. Considering the effect of LELI on nerve regeneration was not fully explained until now, this study could suggest the meaningful explanation on the mechanism of LELI effectiveness on neural regeneration. (J Korean Acad Rehab Med 2004; 28: 64-70)