Pogrel M A, Muff D F, Marshall G W
Department of Oral and Maxillofacial Surgery, School of Dentistry, University of California, San Francisco 94143-0440.
Lasers Surg Med. 1993;13(1):89-96. doi: 10.1002/lsm.1900130115.
The morphological changes in dental enamel exposed to a high energy continuous beam surgical carbon dioxide laser were studied with a wet-scanning electron microscope. Utilizing a 1 mm focused beam, energy levels of 5, 10, and 12.5 watts were applied to the external enamel surface of teeth for between 0.05 and 2 seconds. Subsequent examination showed melting and resolidification of the surface enamel. Examination in cross section revealed three different zones of change, which were consistent in thickness. The outer layer of melted and resolidified enamel approximates 100 microns in width, whereas the next zone of acid resistant amorphous enamel measures only 12 microns in width and the third zone of porous enamel measures approximately 110 microns in width. Though of no immediate practical value in dentistry, the exact physical chemical changes occurring in the enamel warrant further investigation.
用湿式扫描电子显微镜研究了暴露于高能连续光束手术二氧化碳激光下的牙釉质的形态变化。利用1毫米聚焦光束，将5瓦、10瓦和12.5瓦的能量水平施加到牙齿的外釉质表面0.05至2秒。随后的检查显示表面釉质发生熔化和再凝固。横截面检查揭示了三个不同的变化区域，其厚度一致。熔化和再凝固的釉质外层宽度约为100微米，而接下来的耐酸无定形釉质区域宽度仅为12微米，第三层多孔釉质区域宽度约为110微米。尽管在牙科领域没有直接的实际价值，但牙釉质中发生的精确物理化学变化值得进一步研究。
