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首页> 外文会议>Conference on Lasers in Dentistry Ⅶ Jan 21-22, 2001, San Jose, USA >Effects of acid and laser treatments on the dentin nanocrystals
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Effects of acid and laser treatments on the dentin nanocrystals

机译：酸和激光处理对牙本质纳米晶体的影响

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摘要

The effects of laser or acid exposure on dentin have been explored for a number of years. Many researchers quote the recrystallization process, therefore there has been no scientific-oriented analysis regarding this issue. The first use of the word ''recrystallization" in laser treated dentin, was done by Dederich et al (1984). They referred to needle-like crystals observed under Scanning Electron Microscopy (SEM) with high magnification (X2020). Further researchers continued quoting the recrystallization process in their works even though no evidence of crystals could be seen in their SEM pictures. In this work, four specimens of third human molars were prepared: one specimen was conditioned with 37 percent phosphoric acid, another was irradiated with a 10 Hz Er:YAG laser at 400 mJ, and the last one was irradiated with a 10 Hz Nd:YAG laser at 1,5 W, after receiving the Er:YAG laser treatment. We maintained a control sample with no treatment. The samples were submitted to X-ray diffraction measurements and SEM, performed with the JSM-5900LV microscope of the LME/LNLS.
机译：激光或酸暴露对牙本质的影响已经探索了很多年。许多研究人员引用了重结晶过程，因此，对此问题还没有进行科学的分析。 Dederich等人（1984）在激光处理过的牙本质中首次使用了“重结晶”一词，他们指的是在扫描电子显微镜（SEM）下以高放大倍数（X2020）观察到的针状晶体。即使在扫描电镜照片中看不到晶体的迹象，他们也引用了他们的重结晶过程。在这项工作中，准备了四个第三颗人类臼齿的标本：一个标本用37％的磷酸调节，另一个标本用10％的磷酸辐照。接受Er：YAG激光处理后，以400 mJ的Hz的Er：YAG激光照射，最后一个以1.5 W的10 Hz的Nd：YAG激光照射，我们保持未经处理的对照样品。用LME / LNLS的JSM-5900LV显微镜进行X射线衍射测量和SEM。

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