扫描电子显微镜
通量
激光器
材料科学
搪瓷漆
Crystal(编程语言)
波长
辐照
剥脱关节
融合
光学
电子显微镜
分析化学(期刊)
光电子学
化学
纳米技术
复合材料
程序设计语言
语言学
哲学
物理
石墨烯
色谱法
计算机科学
核物理学
作者
S.M. McCormack,Daniel Fried,J.D.B. Featherstone,Richard E. Glena,W. Seka
标识
DOI:10.1177/00220345950740101201
摘要
Studies of the effects of carbon dioxide (CO 2 ) lasers on dental enamel have demonstrated that surface changes can be produced at low fluences (< 10 J/cm2) if wavelengths are used which are efficiently absorbed by the hard tissues. In this study, scanning electron microscopy (SEM) was used to characterize the wavelength dependence of surface changes in dental enamel after exposure to an extensive range of CO 2 laser conditions. Bovine and human enamel were irradiated by a tunable, pulsed CO 2 laser (9.3, 9.6, 10.3, 10.6 μm), with 5, 25, or 100 pulses, at absorbed fluences of 2, 5, 10, or 20 J/cm2, and pulse widths of 50, 100, 200, 500 us. SEM micrographs revealed evidence of melting, crystal fusion, and exfoliation in a wavelength-dependent manner. Crystal fusion occurred at absorbed fluences as low as 5 J/cm 2 per pulse at 9.3, 9.6, and 10.3 μm, in contrast to no crystal fusion at 10.6 pm (≤ 20 J/cm 2 ). Longer pulses at constant fluence conditions decreased the extent of surface melting and crystal fusion. The total number of laser pulses delivered to the tissue did not significantly affect surface changes as long as a minimum of 5 to 10 pulses was used. Within the four easily accessible wavelengths of the CO 2 laser, there are dramatic differences in the observed surface changes of dental hard tissue.
科研通智能强力驱动
Strongly Powered by AbleSci AI