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首页> 外文期刊>Optics and Lasers in Engineering >Study on elucidation of bactericidal effects induced by laser beam irradiation Measurement of dynamic stress on laser irradiated surface
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Study on elucidation of bactericidal effects induced by laser beam irradiation Measurement of dynamic stress on laser irradiated surface

机译：阐明激光束辐照的杀菌作用的研究测量激光辐照表面上的动态应力

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摘要

In dental treatment, many types of laser beams have been used for various surgical treatments, and the influences of laser beam irradiation on bactericidal effect have been investigated. However, most of the work has been performed by irradiating to an agar plate with the colony of bacteria, and very few studies have been reported on the physical mechanism of bactericidal effects induced by laser beam irradiation. This paper deals with the measurement of dynamic stress induced in extracted human enamel by irradiation with Nd:YAG laser beams. Laser beams can be delivered to the enamel surface through a quartz optical fiber. Dynamic stress induced in the specimen using elastic wave propagation in a cylindrical long bar made of aluminum alloy is measured. Laser induced stress intensity is evaluated from dynamic strain measured by small semiconductor strain gauges. Carbon powder and titanium dioxide powder were applied to the human enamel surface as absorbents. Additionally, the phenomenon of laser beam irradiation to the human enamel surface was observed with an ultrahigh speed video camera. Results showed that a plasma was generated on the enamel surface during laser beam irradiation, and the melted tissues were scattered in the vertical direction against the enamel surface with a mushroom-like wave. Averaged scattering velocity of the melted tissues was 25.2 m/s. Induced dynamic stress on the enamel surface increased with increasing laser energy in each absorbent. Induced dynamic stresses with titanium dioxide powder were superior to those with carbon powder. Induced dynamic stress was related to volume of prepared cavity, and induced stress for the removal of unit volume of human enamel was 0.03 Pa/mm~3.
机译：在牙科治疗中，许多类型的激光束已经用于各种外科治疗，并且已经研究了激光束辐照对杀菌效果的影响。但是，大多数工作是通过用细菌菌落照射琼脂平板进行的，关于激光束照射引起的杀菌作用的物理机理的报道很少。本文研究了用Nd：YAG激光束照射提取的人牙釉质中诱发的动态应力。激光束可以通过石英光纤传递到搪瓷表面。测量在铝合金制成的圆柱形长条中利用弹性波传播在样品中引起的动应力。激光诱导的应力强度是通过由小型半导体应变仪测得的动态应变来评估的。将碳粉和二氧化钛粉作为吸收剂涂在人体搪瓷表面。另外，用超高速摄像机观察到激光照射到人体釉质表面的现象。结果显示，在激光束照射期间在釉质表面上产生等离子体，并且熔化的组织以蘑菇状波在垂直方向上相对于釉质表面散射。融化的组织的平均散射速度为25.2 m / s。随着每种吸收剂中激光能量的增加，搪瓷表面上引起的动态应力也会增加。二氧化钛粉末引起的动态应力优于碳粉末。动感应应力与制备腔体的体积有关，去除人牙釉质单位体积的感应应力为0.03 Pa / mm〜3。

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  • 来源
    《Optics and Lasers in Engineering》 |2010年第9期|P.827-833|共7页
  • 作者

    Tatsuaki Furumoto; Atsushi Kasai; Hiroshi Tachiya; Akira Hosokawa; Takashi Ueda;

  • 作者单位

    Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

    Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

    Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

    Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

    Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    dental treatment; Nd:YAG laser beam; dynamic stress; ultrahigh speed video camera; absorbent;

    机译：牙科治疗;Nd：YAG激光束;动应力超高速摄像机;吸收剂;

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