The use of Er:YAG laser for cavity preparation: an SEM evaluation |
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| Authors: | Freitas Patricia Moreira Navarro Ricardo Scarparo Barros Juliana Almeida de Paula Eduardo Carlos |
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| Affiliation: | 1. Department of Restorative Dentistry, School of Dentistry, University of S?o Paulo, S?o Paulo, Brazil;2. Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of S?o Paulo, S?o Paulo, Brazil;3. Special Laboratory of Lasers in Dentistry, School of Dentistry, University of S?o Paulo, S?o Paulo, Brazil |
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| Abstract: | OBJECTIVE: The purpose of this study was to evaluate morphological changes in cavities prepared by the Er:YAG laser (2.94 mum) at different parameters of irradiation and by a diamond bur. EXPERIMENTAL DESIGN: Cavities were prepared on 27 human molars (n = 3): G1, 15 Hz/160 mJ enamel/6 Hz/200 mJ dentin; G2, 15 Hz/180 mJ enamel/6 Hz/200 mJ dentin; G3, 15 Hz/160 mJ enamel/6 Hz/250 mJ dentin; G4, 15 Hz/180 mJ enamel/6 Hz/250 mJ dentin; G5, 15 Hz/180 mJ enamel/10 Hz/180 mJ dentin; G6, 15 Hz/160 mJ enamel/10 Hz/180 mJ dentin; G7, 15 Hz/160 mJ enamel/10 Hz/160 mJ dentin; G8, 15 Hz/180 mJ enamel/10 Hz/160 mJ dentin; G9, diamond bur. For SEM analysis, samples were fixed (2.5% glutaraldheyde, 12 h, 4 degrees C), dehydrated (25-100% ethanol), dried, and sputter-coated with gold. RESULTS: Despite the changes on energy and repetition-rate settings, all laser-treated samples showed no evidence of thermal damage or signs of burning and melting. Er:YAG laser ablated dental hard tissues showed exposed enamel prisms, dentin surface without smear layer, and opened dentinal tubules. CONCLUSION: Different Er:YAG laser parameters were effective for ablation of hard tissues, creating an irregular and microretentive morphological pattern without hard tissue damage. |
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| Keywords: | erbium laser enamel dentin tooth preparation microscopy |
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