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首页> 外文会议>Conference on Lasers in Dentistry IX Jan 26-27, 2003 San Jose, California, USA >MODELLING OF THE HUMAN ENAMEL LASER ABLATION PROCESS AT THE MESOSCOPIC SCALE
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MODELLING OF THE HUMAN ENAMEL LASER ABLATION PROCESS AT THE MESOSCOPIC SCALE

机译：介观尺度下人类瓷釉激光消融过程的建模

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摘要

A mesoscopic simulation of the process of human enamel laser ablation by Er:YAG and CO_2 lasers is being developed using the finite element method, taking into account the complex structure and chemical composition of this material. A geometric model that allows studying in detail the temperature, stress and displacement distribution within a few enamel rods is presented. The heat generation that takes place inside the enamel at the centre of the laser spot, caused by a non-ablative laser pulse emitted by CO_2 and Er.YAG lasers, was simulated. The sensitivity of our model to the estimated material parameters was studied. Temperature, displacement and stress distribution maps obtained for both lasers are presented. These preliminary results suggest that the temperature distribution across the enamel rods is different in the two situations considered; thermally induced stresses in the material are higher in the regions that are richer in hydroxyapatite (HA), and the higher displacements are observed in the regions that are rich in water. The rod tails inside enamel present higher stresses in the direction perpendicular to the surface of enamel than the ones that are created at the surface of our simulated structure. We conclude that the mesostructure plays a crucial role in the accurate modelling of dental laser ablation.
机译：考虑到这种材料的复杂结构和化学成分，正在使用有限元方法对Er：YAG和CO_2激光烧蚀人类牙釉质过程的介观模拟。提出了一个几何模型，可以详细研究几个搪瓷棒内的温度，应力和位移分布。模拟了CO_2和Er.YAG激光器发出的非烧蚀激光脉冲引起的搪瓷内部激光点中心的发热。我们的模型对估计的材料参数的敏感性进行了研究。给出了两种激光器获得的温度，位移和应力分布图。这些初步结果表明，在所考虑的两种情况下，搪瓷棒上的温度分布是不同的。在富含羟基磷灰石（HA）的区域中，材料中的热诱导应力较高，而在富含水的区域中观察到较高的位移。牙釉质内部的杆尾在垂直于牙釉质表面的方向上比在我们的模拟结构表面产生的应力更高。我们得出结论，介观结构在牙科激光烧蚀的精确建模中起着至关重要的作用。

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