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首页> 美国卫生研究院文献>Materials >Removal of Composite Restoration from the Root Surface in the Cervical Region Using Er: YAG Laser and Drill—In Vitro Study
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Removal of Composite Restoration from the Root Surface in the Cervical Region Using Er: YAG Laser and Drill—In Vitro Study

机译：使用ER：YAG激光和钻头体外研究从宫颈区域中的根表面除去复合复合恢复

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Background: Recently, the defects of the tooth surface in the cervical region are often restored using composite filling materials. It should meet the needs of the patients regarding esthetics and material stability. The aim of the study was to analyze the tooth root surface at the cervical region after the removal of the composite filling material by means of the Erbium-doped Yttrium Aluminium Garnet (Er: YAG) laser or drill using the scanning electron microscopy (SEM) and fluorescence microscopy. Materials and Methods: For the purposes of this study, 14 premolar teeth ( = 14) were removed due to orthodontic reasons. The rectangular shape cavities with 3 mm in width and 1.5 mm in height were prepared with a 0.8 mm bur on high-speed contra-angle in the tooth surface just below cemento-enamel junction (CEJ) and filled with the composite material. The composite material was removed with the Er: YAG laser at a power of 3.4 W, energy 170 mJ, frequency 20 Hz, pulse duration 300 μs, tip diameter 0.8 mm, air/fluid cooling 3 mL/s, and time of irradiation: 6 sec, at a distance from teeth of 2 mm (G1 group, = 7) or a high-speed contra-angle bur (G2 group, = 7). After the removal of composite material, the surfaces of teeth were examined using the scanning electron microscopy (SEM) and fluorescence microscopy. Results: The Er: YAG irradiation allowed to remove completely the composite material from the tooth cavity. The study confirmed, that the ends of collagen fibers were only partially denatured after the Er: YAG laser application. Conclusion: It has been proved that using the Er: YAG laser is an effective and safe method of composite removal for the dentin surface.
机译：背景：最近，使用复合材料填充材料经常恢复颈部区域中的牙齿表面的缺陷。它应该满足患者关于美学和材料稳定性的需求。该研究的目的是通过使用扫描电子显微镜（SEM）通过erbium掺杂的钇铝石榴石（ER：YAG）激光或钻头去除复合填充材料后分析宫颈区域的齿根表面。使用扫描电子显微镜（SEM）和荧光显微镜。材料和方法：出于本研究的目的，由于原因畸形，将14个磨牙齿（= 14）除去。用0.8mm Bur在牙齿表面的高速反射角度下方的高速反射角度下，在牙齿表面下方的高速反射角度下，矩形形状宽度，高度为1.5mm的矩形形状腔体，并用复合材料填充。用ER：YAG激光器除去复合材料，电源为3.4W，能量170MJ，频率20Hz，脉冲持续时间300μs，尖端直径0.8mm，空气/流体冷却3mL / s，以及照射时间： 6秒，距牙齿为2mm（G1组，= 7）或高速对比角（G2组，= 7）。在去除复合材料之后，使用扫描电子显微镜（SEM）和荧光显微镜检查牙齿的表面。结果：ER：YAG照射允许完全从牙齿腔中取出复合材料。该研究证实，胶原纤维的末端仅在ER：YAG激光应用后部分变性。结论：已经证明，使用ER：YAG激光是牙本质表面的有效和安全的复合材料去除方法。

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