Recently, lasers operating at shorter and shorter wavelengths have become available. The excimer laser emits pulses of ultraviolet wavelengths. The KrF excimer laser has high incision efficiency, and can cut bone tissue without thermal damage.
An incision was made on the rats femur by laser at pulse energy: 50mJ, beam spot: 0.3mm, pulse width: 15ns, peak power: 3.3MW, energy density: 78J/cm2, incision speed: 4mm/ min, irradiation time: 30s, and frequency: 5, 10, 20, 40Hz. The femurs were examined histopathologically 1, 2 and 4 weeks after the operation.
At all laser settings the femurs had a layer of thermal damage around the cortical bone. In the case of the femurs examined at the postoperative 4 th week, the new bone did not connect with the cortical bone.
