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首页> 外文会议>Conference on Lasers in Dentistry Ⅷ, Jan 20-21, 2002, San Jose, USA >Pulpal Safety of a 9.6μm TEA CO_2 Laser Used for Caries Prevention
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Pulpal Safety of a 9.6μm TEA CO_2 Laser Used for Caries Prevention

机译：用于预防龋齿的9.6μmTEA CO_2激光的眼球安全性

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摘要

Lasers are used for several procedures involving hard and soft tissues of the oral cavity. Included in those procedures is the use of the CO_2 laser to alter the surface structure of tooth enamel to render it more resistant to caries. A new 9.6 μm wavelength TEA CO_2 laser (Argus Photonics, Jupiter, FL) has been investigated as a device that can be used for this procedure without harming the dental pulp. Erupted, caries and restoration free third molars (n=24) were used in the experiment. Teeth were irradiated at an incident fluence of 1.5J/cm~2 and a repetition rate of 10Hz and a spot size 1mm in diameter. At the low and high settings, 200 to 400 pulses were delivered at 12mJ per pulse for a total energy of 2.4 or 4.8J delivered for 20 or 40 seconds respectively. Other teeth were subjected to a sham dental procedure (positive control) or no procedure (negative control). Prior to testing, radiographs were taken of all teeth, and they were tested pulpally using heat, cold and electricity to determine vitality. The teeth were removed either immediately or at one week or one month after testing. They were bioprepared and examined histologically for signs of inflammation. Only one tooth developed symptoms of sensitivity to cold for 10 days following exposure to the high power level. The sensitivity was of fleeting duration and was judged to be reversible pulpitis. All teeth tested responded normally at pretesting and pre-extraction time periods. Histological examination disclosed no indication of an inflammatory response in the pulp tissue. All sections appeared normal with no changes seen in the normal pulpal morphology. We conclude that the 9.6 μm wavelength laser causes no pulpal damage at the energy levels used and can be used safely for caries prevention treatments.
机译：激光用于涉及口腔硬组织和软组织的多种手术。这些程序中包括使用CO_2激光改变牙齿珐琅质的表面结构，使其更耐龋齿。已经研究了一种新型的9.6μm波长TEA CO_2激光器（Argus Photonics，Jupiter，FL），该设备可用于该过程而不会损害牙髓。实验中使用了喷出的龋齿和无修复的第三磨牙（n = 24）。以1.5J / cm〜2的入射通量，10Hz的重复频率和1mm直径的光斑照射牙齿。在低设置和高设置下，以每个脉冲12mJ的速度发送200至400个脉冲，分别以20或40秒的时间传递2.4或4.8J的总能量。其他牙齿接受假牙手术（阳性对照）或不接受假牙（阴性对照）。在测试之前，先对所有牙齿进行射线照相，然后使用热，冷和电对它们进行牙髓测试以确定活力。在测试后立即或在一周或一个月将牙齿去除。他们进行了生物制备，并进行了组织学检查是否有炎症迹象。暴露于高功率水平的10天后，只有一颗牙齿出现对冷敏感的症状。敏感性是短暂的持续时间，被认为是可逆性牙髓炎。所有测试的牙齿在预测试和拔出前的时间段内均正常反应。组织学检查未显示出牙髓组织中炎症反应的迹象。所有切片均显示正常，正常牙髓形态无变化。我们得出结论，波长为9.6μm的激光在所使用的能量水平下不会造成牙髓损伤，可以安全地用于龋齿预防治疗。

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