The therapeutic effects of laser irradiation attract much attention of surgeons.
The most interest focussed on the soft tissue including skin, mucosal membrane, muscle and visceral organs and hard tissue including dentin and osseous tissue. The above-mentioned tissues are quite different in optic property and the reaction to laser irradiation differs in each tissue or in each organ. In this view point, the author has investigated the therapeutic effect of laser. A particular attention has been paid an deepness and thermal alteration based in laser irradiation. Moreover for the confirmation of the safety against to the laser irradiation, the study of similitude with a trial irradiation has been performed.
The result indicates that the depth of the incision and the extent of the thermal injury were coincidental with cases of reversed Coefficient of incisional velocity and liberating power of laser irradiation. And single pulse irradiation and continuous wave irradiation reveal that the thermal injury in the peripheral region remained to be little extent respectively.
Simultaneously, the tissue reaction for laser irradiation in case of normal saline injection in the subcutaneous tissue and so on have been investigated.