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首页> 外文期刊>Journal of dentistry >Effect of Er:YAG laser and organic matrix on porosity changes in human enamel.
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Effect of Er:YAG laser and organic matrix on porosity changes in human enamel.

机译：Er：YAG激光和有机基质对人牙釉质孔隙率变化的影响。

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Objectives. Cariostatic effects of lasers have been well documented in the past few decades; however, the mechanisms remain unclear. Our previous study revealed the statistically significant effect of organic matrix (OM) in the laser-induced caries prevention. The aim of the present study is to further investigate the role of organic matters in the laser-induced porosity changes.Methods. Enamel powder from five sound molars was randomly divided into two samples. One sample was treated with approximately 10% NaClO solution to remove OM and the other was left untreated. Both groups were then subjected to irradiation by an Er:YAG laser. The samples were characterized by thermogravimetric analysis (TGA) and N(2) physico-adsorption.Results. TGA results confirmed that the NaClO treatment had at least partially removed the OM in enamel powder. The surface area and pore volume of normal enamel powder decreased significantly after laser treatment. In contrast, in the NaClO-treated enamel powder, laser treatmentdid not significantly decrease the surface area and the pore volume remained almost unchanged. The substantial difference between the normal enamel powder and the NaClO-treated enamel powder after laser treatment confirmed the laser-induced blocking of OM in the micro-diffusion pathway in enamel.Conclusion. The findings in this study seemed to substantiate the 'organic blocking theory' as one of the mechanisms in the laser-induced caries prevention.
机译：目标。在过去的几十年中，激光的抗癌作用已经得到了很好的证明。但是，机制尚不清楚。我们先前的研究揭示了有机基质（OM）在预防激光诱发龋齿方面具有统计学意义。本研究的目的是进一步研究有机物在激光诱导的孔隙度变化中的作用。将来自五个健全磨牙的搪瓷粉随机分为两个样品。一个样品用大约10％NaClO溶液处理以去除OM，另一个样品不处理。然后两组均用Er：YAG激光照射。通过热重分析（TGA）和N（2）物理吸附对样品进行表征。结果。 TGA结果证实，NaClO处理至少部分除去了搪瓷粉末中的OM。激光处理后，普通搪瓷粉的表面积和孔容显着下降。相反，在经NaClO处理的搪瓷粉末中，激光处理并未显着减小表面积，并且孔体积几乎保持不变。正常牙釉质粉末和经NaClO处理的牙釉质粉末在激光处理后的实质差异证实了激光诱导的OM在牙釉质微扩散途径中的阻滞。这项研究的发现似乎证实了“有机阻滞理论”是激光诱导龋齿预防的机制之一。

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