1993 Volume 4 Issue 1 Pages 45-48
Recently, lasers operating at shorter and shorter wavelengths have becomeavailable. The excimer laser emits pulses of ultraviolet wavelengths.The KrF excimer laserhas high incision efficiency, and can cut hard tissue without thermal damage. An incisionwas made on the mandibular bone of a pig by laser under the following conditions. Frequency: 60Hz, pulse energy: 32mJ, pulse width: 15ns, beam spot size: 1.5×0.4mm2, energy density: 5.3J/cm2, irradiation time: 5min, volume of distilled water: 5l/min, andvolume of assist gas: 30l/min. After irradiation, visual, pathological and SEM observations was carried out. There were almost no thermal damage layers. The surface of boneincision was comparatively sharp. But, SEM finding showed the melting of tissue at the surface of bone.
