Effect of Laser Irradiation on Fracture Toughness of Bovine Enamel
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概要
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The purpose of this study is to research the change of mechanical properties of dental enamel around the laser irradiated area. CO<SUB>2</SUB> laser and Er: YAG laser were irradiated bovine enamel at 23-161J/cm<SUP>2</SUP>, and the its fracture toughness was examined by means of indentation microfracture method.<BR>The fracture toughness of bovine enamel irradiated by CO<SUB>2</SUB> laser was reduced compared with control at any irradiation energy. On the other hand Er: YAG laser irradiation at all energy condition did not cause the reduction of the fracture toughness.<BR>These result suggest that Er: YAG laser is useful in preparation of tooth without mechanical changes of enamel around irradiated area.
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