Dental hard tissue drilling by longitudinally excited CO2 laser
Dental hard tissue drilling by longitudinally excited CO2 laser
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利用纵向激发 CO2 激光进行牙科硬组织钻孔
DOI：
10.1117/12.2284944
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Jitsuno Takahisa
中科院分区：
文献类型：
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作者：
Uno Kazuyuki;Yamamoto Takuya;Akitsu Tetsuya;Jitsuno Takahisa
研制了长光腔纵向激励CO2激光器，研究了牙体硬组织的打孔特性。该激光器结构简单，由内径为13 mm、长45 cm的氧化铝陶瓷管、脉冲电源、升压变压器、存储电容、火花隙和腔长175 cm的长光腔组成。产生了脉冲宽度为337 ns、能量为1.9mJ的尖峰脉冲、脉冲尾长为180μ的S脉冲、能量为37.6mJ的短脉冲和环状光束。在调查中，样本是自然干燥的人类牙齿(牙釉质和牙本质)。在加工系统中，使用了焦距为50 mm的锌硒聚焦透镜，焦平面的位置是样品表面的位置。在1脉冲辐照条件下，研究了不同辐照剂量下的打孔特性。在牙釉质和牙本质的钻孔中，钻孔深度随注入量的增加而增加。能量密度为21.5J/cm2的1次脉冲照射，牙釉质钻孔深度为79.3μm，牙本质钻孔深度为152.7μm。与长脉冲CO2激光相比，短脉冲CO2激光在牙体硬组织加工中具有更深的钻孔深度和更低的注量。
We developed a longitudinally excited CO 2 laser with a long optical cavity and investigated the drilling characteristics of dental hard tissue. The CO 2 laser was very simple and consisted of a 45-cm-long alumina ceramic pipe with an inner diameter of 13 mm, a pulse power supply, a step-up transformer, a storage capacitance, a spark gap, and a long optical cavity with a cavity length of 175 cm. The CO 2 laser produced a short pulse that had a spike pulse with the width of 337 ns and the energy of 1.9 mJ, a pulse tail with the length of 180 μs and the energy of 37.6 mJ, and a doughnut-like beam. In the investigation, a sample was a natural drying human tooth (enamel and dentine). In a processing system, a ZnSe focusing lens with the focal length of 50 mm was used and the location of the focal plane was that of the sample surface. In 1 pulse irradiation, the drilling characteristics depended on the fluence was investigated. In the enamel and dentin drilling, the drilling depth increased with the fluence. The 1 pulse irradiation with the fluence of 21.5 J/cm 2 produced the depth of 79.3 μm in the enamel drilling, and the depth of 152.7 μm in the dentin drilling. The short-pulse CO 2 laser produced a deeper drilling depth at a lower fluence than long-pulse CO 2 lasers in dental hard tissue processing.