Morphological comparative study on ablation of dental hard tissues at cavity preparation by Er:YAG and Er,Cr:YSGG lasers
Morphological comparative study on ablation of dental hard tissues at cavity preparation by Er:YAG and Er,Cr:YSGG lasers
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DOI：
10.1089/pho.2005.23.52
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发表时间：
2005-02-01
影响因子：
--
通讯作者：
Matsumoto, K
中科院分区：
文献类型：
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作者：
Harashima, T;Kinoshita, JI;Matsumoto, K
目的：本研究的目的是从形态学上评价两种类型的激光设备：Er：YAG和ErCr：YSGG激光器在体外制备V类洞时对牙体硬组织的消融。背景资料：目前还没有关于Er：YAG和ErCr：YSGG激光在洞制备时进行牙体组织消融的比较研究的报道。方法：22颗离体成人磨牙，分为两组，每组11颗。Er：YAG激光照射组以250 mJ/pulse、15 Hz的频率进行水喷雾照射，ErCr：YSGG激光照射组以5 W、20 Hz的频率进行水喷雾照射。洞制备后，牙齿脱水，涂铂，并通过扫描电子显微镜检查。结果如下：两种激光器械均能够消融牙齿硬组织，但观察到相似、不规则和粗糙的表面，深度不同。Er，Cr：YSGG激光制备的洞内牙本质小管较Er：YAG激光制备的洞内牙本质小管更清晰。在用ErCr：YSGG激光器制备的腔体上观察到较小的宽度和剥离表面。结论：结果表明，Er：YAG和ErCr：YSGG两种激光器在制备V类腔时的形貌差异不大，因为两种激光器都能制备V类腔，并且辐照表面的形貌特征非常相似。
Objective: The purpose of this study was to evaluate morphologically the dental hard tissue ablation at the class V cavity preparation by two types of laser devices: Er:YAG and ErCr:YSGG lasers in vitro. Background Data: There have been no reports on the comparative study of dental tissue ablation at cavity preparation by Er:YAG and ErCr:YSGG lasers. Methods: Twenty-two extracted human mature molar teeth were used in this study and divided into two groups of 11 teeth each. The teeth of the Er:YAG laser-irradiated group were irradiated at the parameters of 250 mJ/pulse and 15 Hz with water spray, and those of the ErCr:YSGG laser-irradiated group were irradiated at the parameters of 5 W and 20 Hz with water spray. After cavity preparation, the teeth were dehydrated, coated with platinum, and examined by scanning electron microscopy. Results: Both of the laser devices were capable of ablating dental hard tissues, but similar, irregular, and rugged surface aspects with different depths were observed. Open dentinal tubules at the cavities prepared by Er,Cr:YSGG laser were more clearly visible than those prepared by Er:YAG laser. Smaller width and stripped surfaces were observed on the cavities prepared by ErCr:YSGG laser. Conclusion: The results suggested that there is little difference between the two types of lasers-Er:YAG and ErCr:YSGG lasers-morphologically for class V cavity preparation, because both lasers were capable of preparing class V cavities, and the morphological features of the irradiated surfaces were very similar.