Fundamental Study of KrF Excimer Laser:The Fourth Report: Bone Incision of Resected Human Mandibular Bone and it's Incised View

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The KrF excimer laser is a high power pulsed laser oscillating in the ultraviolet field and able to destroy or amputate molecules of tissue without thermal damage. In order to evaluate the effects of KrF excimer laser irradiation on human mandibular bone, we examined by visual, pathological and SEM observation. The laser irradiation on human mandibular bone resected by oral and maxillofacial surgery had a pulse energy: 65mJ, spot size: 0.80×0.50mm2, energy density: 16J/cm2, water volume: 6.5ml, assist gas (N2): 301/min, frequency: 80Hz, incision speed: 5, 10, 15mm/min. Visual observation: the incisions were sharp without thermal damage, and the depth of the inicions ranged from 0.68 to 2.53mm according to the incision speed. Pathological observation: the inicisions were almost sharp and there was almost no thermal damage layer. SEM observation: the incision section was slightly wavy, but the incision surface was almost clear at 20 magnification. Crystals formed at the incision surface at all incision speeds, and there was no melting of bone tissue at 5000 magnification.
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