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In Vitro Assessment of the Acid Resistance of Demineralized Enamel Irradiated With Er, Cr:YSGG and Nd:YAG Lasers

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Purpose: This study's purpose was to evaluate the acid resistance of demineralized enamel irradiated with high-intensity lasers. Methods: Enamel fragments were demineralized and treated as follows (N=10): Group 1—no treatment; Group 2—five percent sodium fluoride (NaF) varnish; Group 3—Er, Cr:YSGG laser (8.92 J/cm2, 0.5 W, 20 Hz, 30 seconds); Group 4—NaF and Er, Cr:YSGG laser; Group 5—Er, Cr:YSGG laser and NaF; Group 6—Nd:YAG laser (84.9 J/cm2, 0.5 W, 10 Hz, 30 seconds); Group 7—NaF and Nd:YAG laser; and Group 8—Nd:YAG laser and NaF. The samples were subjected to pH-cycling and assessed by microhardness (analysis of variance; α equals five percent) at different depths from the outer enamel surface. Samples were observed using polarized light microscopy (PLM) and scanning electron microscopy (SEM). Results: There were no significant differences among the experimental groups in any of the subsurface layers evaluated. PLM observation revealed that the extent of demineralization of the irradiated samples was similar to the samples for Group 1 (control). SEM observation showed that irradiated surfaces were ablated and presented areas of melting. Conclusions: Laser irradiation, with or without applying five percent sodium fluoride, was not capable of increasing the enamel white spot lesions' acid resistance.
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Keywords: ENAMEL; HARDNESS; LASERS; WHITE SPOTS

Document Type: Research Article

Affiliations: 1: School of Dentistry, University of Uberaba, Minas Gerais, Brazil 2: Biopathology Division; in the School of Dentistry, University of Uberaba, Minas Gerais, Brazil 3: Biomaterials Division; in the School of Dentistry, University of Uberaba, Minas Gerais, Brazil 4: Department of Restorative Dentistry, Ribeirão Preto School of Dentistry, University of São Paulo, São Paulo, Brazil 5: Biomaterials Division, School of Dentistry, University of Uberaba, Minas Gerais, Brazil. [email protected]

Publication date: November 1, 2014

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  • Pediatric Dentistry is the official publication of the American Academy of Pediatric Dentistry, the American Board of Pediatric Dentistry and the College of Diplomates of the American Board of Pediatric Dentistry. It is published bi-monthly and is internationally recognized as the leading journal in the area of pediatric dentistry. The journal promotes the practice, education and research specifically related to the specialty of pediatric dentistry. This peer-reviewed journal features scientific articles, case reports and abstracts of current pediatric dental research.
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