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SEM analysis of enamel surface treated by Er : YAG laser: Influence of irradiation distance

机译：Er：YAG激光处理的搪瓷表面的SEM分析：照射距离的影响

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Background: Depending on the distance of laser tip to dental surface a specific morphological pattern should be expected. However, there have been limited reports that correlate the Er:YAG irradiation distance with dental morphology. Purpose: To assess the influence of Er:YAG laser irradiation distance on enamel morphology, by means of scanning electron microscopy (SEM). Methods: Sixty human third molars were employed to obtain discs (congruent to 1 mm thick) that were randomly assigned to six groups (n = 10). Five groups received Er:YAG laser irradiation (80 mJ/2 Hz) for 20 s, according to the irradiation distance: 11, 12, 14, 16, or 17 mm. and the control group was treated with 37% phosphoric acid for 15 s. The laser-irradiated discs were bisected. One hemi-disc was separated for superficial analysis without subsequent acid etching, and the other one, received the phosphoric acid for 15 s. Samples were prepared for SEM. Results: Laser irradiation at 11 and 12 min provided an evident ablation of enamel, with evident fissures and some fused areas. At 14, 16 and 17 mm the superficial topography was flatter than in the other distances. The subsequent acid etching on the lased-surface partially removed the disorganized tissue. Conclusions: Er:YAG laser in defocused mode promoted slight morphological alterations and seems more suitable for enamel conditioning than focused irradiation. The application of phosphoric acid on lased-enamel surface, regardless of the irradiation distance, decreased the superficial irregularities.
机译：背景：根据激光笔尖到牙齿表面的距离，应预期到特定的形态学图案。然而，很少有报道将Er：YAG的照射距离与牙齿的形态联系起来。目的：通过扫描电子显微镜（SEM）评估Er：YAG激光照射距离对牙釉质形态的影响。方法：使用六十个人的第三颗磨牙获得视盘（相当于1毫米厚），将其随机分为六组（n = 10）。根据照射距离：11、12、14、16或17 mm，五组接受Er：YAG激光照射（80 mJ / 2 Hz）20 s。对照组用37％磷酸处理15 s。将激光照射的光盘一分为二。分离一个半盘进行表面分析，而无需随后的酸蚀，另一个半盘接受磷酸15 s。准备用于SEM的样品。结果：11和12分钟的激光照射可明显清除牙釉质，有明显的裂缝和一些融合区域。在14、16和17毫米处，表面形貌比其他距离平坦。随后在激光表面上进行酸蚀，部分去除了杂乱的组织。结论：散焦模式的Er：YAG激光促进了轻微的形态学改变，似乎比聚焦辐照更适合搪瓷调理。不管照射距离如何，在激光瓷釉表面上施加磷酸都可以减少表面不规则性。

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