• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Conference on Lasers in Dentistry Ⅷ, Jan 20-21, 2002, San Jose, USA >Mass Spectrometric analysis of evolved CO_2 during 9.6-?m CO_2 irradiation of dental enamel
【24h】

Mass Spectrometric analysis of evolved CO_2 during 9.6-?m CO_2 irradiation of dental enamel

机译：牙釉质9.6-µm CO_2辐射过程中析出的CO_2的质谱分析

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Carbon dioxide laser irradiation induces chemical changes in dental hard tissues including, dehydration, decomposition, disproportionation, and vaporization. Such changes can lead to either an increase or decrease in susceptibility to acid dissolution and adversely affect the bond strength to restorative materials. The objective of this study was to measure the evolved molecular species produced during laser irradiation. Samples of bovine enamel were irradiated by a 9.6 ?m TEA CO_2 laser in a vacuum chamber connected to a quadruple mass spectrometer. At irradiation intensities above 0.37 J/cm~2 an increase in evolved CO_2 and H_2O were detected indicative of thermal decomposition of the mineral phase. The respective ion yields changed markedly with increasing number of laser pulses suggesting that the decomposition was complete after less than ten laser pulses at irradiation intensities from 0.4 to 0.8 J/cm~2. Above irradiation intensities of 1.0 J/cm~2 there is continual emission after 50 laser pulses indicative of vaporization and material removal. At higher ablative fluence, higher mass species were detected due to the ejection of hydroxyapatite. This study demonstrates that mass spectroscopy can be used to directly probe laser induced physical and chemical changes in dental hard tissue during laser ablation.
机译：二氧化碳激光辐射会引起牙齿硬组织化学变化，包括脱水，分解，歧化和汽化。这种变化会导致酸溶解的敏感性增加或降低，并对与修复材料的粘合强度产生不利影响。这项研究的目的是测量激光辐照过程中产生的进化分子种类。在连接到四重质谱仪的真空室中，用9.6 µm TEA CO_2激光辐照牛牙釉质样品。在高于0.37 J / cm〜2的照射强度下，检测到析出的CO_2和H_2O升高，表明矿物相发生了热分解。各自的离子产率随着激光脉冲数量的增加而显着变化，这表明在0.4至0.8J / cm〜2的照射强度下少于十个激光脉冲之后，分解完成。高于1.0 J / cm〜2的辐照强度，在50次指示蒸发和材料去除的激光脉冲后会连续发射。在较高的烧蚀通量下，由于羟基磷灰石的排出而检测到较高质量的物质。这项研究表明，质谱可用于直接探测激光消融过程中牙齿硬组织中激光诱导的物理和化学变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号