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The purpose of this study was to evaluate the pain relief effects of continuous wave and chopper pulsed wave by semiconductor laser irradiation. The irradiation conditions were as follows: Group A, continuous wave (laser energy 1 w, irradiation time 60 s); Group B, chopper pulsed wave of 20 ms (laser energy 2 w, irradiation time 60 s); Group C, chopper pulsed wave of 20 ms (laser energy 1 w, irradiation...
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