Morphological analysis of cavities prepared by different parameters of Er:YAG laser.

被引：1
作者：
Freitas, PM [1 ]
Navarro, RS [1 ]
Almeida, J [1 ]
Imparato, JCP [1 ]
Eduardo, CP [1 ]
机构：
[1] Univ Sao Paulo, Sch Dent, Dept Restorat Dent, Sao Paulo, Brazil
来源：
LASERS IN DENTISTRY XI | 2005年 / 5687卷
关键词：
Er : YAG laser; enamel; dentin; cavity preparation; morphology; laser parameters; restorations;
D O I：
10.1117/12.602002
中图分类号：
R78 [口腔科学];
学科分类号：
1003 ;
摘要：
The purpose of this study was to evaluate the morphological changes in cavities made by Er:YAG laser (2.94 mu m)(KaVo KEY 3)(LELO-FOUSP) and high-speed drill. Cavities were made on the buccal and lingual surfaces of 27 human molars (Banco de Dentes-FOUSP), using different laser parameters (n=3): G1-15Hz/160mJ enamel/ 6Hz/200mJ dentin; G2-15Hz/180mJ enamel/ 6Hz/200mJ dentin; G3-15Hz/l6OmJ enamel/ 6Hz/250mJ dentin; G4-15Hz/180mJ enamel/ 6Hz/250mJ dentin; G5-15Hz/180mJ enamel/ 10Hz/180mJ dentin; G6-15Hz/160mJ enamel/ 10Hz/180mJ dentin; G715Hz/160mJ enamel/ 10Hz/160mJ dentin; G8-15Hz/180mJ enamel/ 10Hz/160mJ dentin and G9-high-speed drill. Samples were fixed (2.5% glutaraldhyde, 12h, 4 degrees C), dehydrated (25-100% ethanol), dried to a critical point and sputter-coated with gold for analysis under SEM. All laser parameters used showed no evidence of thermal damage and signs of burning and melting, Er:YAG laser ablated dental hard tissues, showing enamel prisms, like scales, dentin surface without smear layer and opened dentinal tubules. It was concluded that Er:YAG laser parameters were effective for ablation of hard tissues, promoting morphological changes in irradiated tissues, creating an irregular and microretentive morphological pattern.
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页码：179 / 189
页数：11
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