Abstract

To examine the chronic effects of the laser exposure on the brain, CO2, Nd: YAG, or the combination of both lasers was exposed for one second and specific gravity method was used to measure water contents of material of the lesion 48 hours after the exposure. Nd: YAG laser exposure showed that water contents in the white matter were more extensive than those of the other modes of laser exposure. CO2 laser exposure showed that water contents in the gray matter were least extensive of the three modes of laser exposure. Effects on the white matter by CO2/YAG coaxial laser exposure were similar to those by CO2 laser exposure.

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