Exchange of Nd: YAG Laser Irradiation and Damage of Microvascularization on the Rats Lingual Dorsum

The purpose of this study was to examine the depth into penetration of the tissue and the circulatory structure of the microvasculature after irradiation the Nd: YAG laser on the lingual dorsum of a 9-week-old male wistar rat.The Nd: YAG laser was irradiated against the tongue of rats under the following condition; the energy level; 1, 2 and 3-Watts for 1.0, 2.0 and 3.0 seconds.Wounds of tongue were observed macroscopically, microscopically and also examined by SEM. The following results were obtained; Microscopical findings: The penetration was observed until the lamina propria in 1W1S and 1W2S groupsThe penetration of 1W3S, 2W2S and 3W1S groups were observed still superior tranversus linguae layer and also were observed in the muscle layer for 3 second group.SEM findings: The capillary loops of the papillae and the lamina propria venure networks were damaged in 1W1S and 1W2S groups.Irradiation wounds disappeared in the capillary loops of the papillae and the lamina propria venure networks.In 1W3S, 2W2S and 3W1S groups, and also disappeared in the capillaries of muscle layer in 3 second groups.(J. Jpn. Soc. Laser Dent. 8: 7-15, 1997 Reprints request to Dr. MATSUMOTO)