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首页> 外文会议>Conference on Lasers in Dentistry Ⅷ, Jan 20-21, 2002, San Jose, USA >Transient FEM Calculation of the Ablation of Hard Dental Tissue Induced by Er:YAG Laser Radiation
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Transient FEM Calculation of the Ablation of Hard Dental Tissue Induced by Er:YAG Laser Radiation

机译：Er：YAG激光辐射致硬性牙组织消融的瞬态有限元计算

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Three dimensional model calculations using Finite Elements were carried out to simulate the heat distribution under IR laser ablation. The thermodynamic constants of dentin were used for heat capacity, heat conductivity etc. Compared to earlier results, the anisotropy of these constants is now considered; i.e. the heat conduction for example is not necessarily independent of the direction but depends on the orientation of the inner structure of the dental tissue. While the results of CO_2 laser ablation were discussed last year, new calculations have been performed for the optical constant of dentin at a wavelength of 2.9 μm. Since the penetration length of 2.9 μm radiation is significantly shorter than that of 10.6 μm, the thermally influenced zone around the laser crater is thinner.
机译：使用有限元进行了三维模型计算，以模拟红外激光烧蚀下的热量分布。牙本质的热力学常数用于热容量，导热系数等。与以前的结果相比，现在考虑了这些常数的各向异性。即，例如，热传导不一定与方向无关，而是取决于牙组织的内部结构的取向。虽然去年讨论了CO_2激光烧蚀的结果，但已经对2.9μm波长的牙本质的光学常数进行了新的计算。由于2.9μm辐射的穿透长度明显短于10.6μm，因此激光弹坑周围的热影响区更薄。

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