title: Fluoride uptake and acid resistance of enamel irradiated with Er:YAG laser.
abstract: This study evaluated the resistance to demineralization and fluoride incorporation of enamel irradiated with Er:YAG. A total of 110 bovine teeth were selected and divided into eight groups: unlased, 37% phosphoric acid, and samples irradiated with the Er:YAG laser at several fluences (31.84 J/cm(2), 25.47 J/cm(2), 19.10 J/cm(2), 2.08 J/cm(2), 1.8 J/cm(2), and 0.9 J/cm(2)). The application of acidulated phosphate fluoride was performed after treatments. All samples were immersed in 2 ml of 2.0 M acetic-acetate acid solution at pH 4.5 for 8 h, and fluoride, calcium, and phosphorus ions dissolved were analyzed by atomic absorption spectrometry and spectrophotometry. The phosphoric acid and 31.84 J/cm(2) groups presented the lowest dissolution of calcium and phosphorus ions. Higher fluoride incorporation was observed on 1.8 J/cm(2) and 0.9 J/cm(2) groups. Based on these results, Er:YAG laser was able to decrease acid dissolution and increase fluoride uptake and can be a promissory alternative for preventive dentistry.
authors: Laboratório Especial de Laser em Odontologia (LELO), Faculdade de Odontologia, Universidade de São Paulo, São Paulo, Brazil.
authors: Flávia M
authors: FM
authors: Bevilácqua
authors: Denise Maria
authors: DM
authors: Zezell
authors: Romeu
authors: R
authors: Magnani
authors: Patricia A
authors: PA
authors: da Ana
authors: Carlos de Paula
authors: Cde P
authors: Eduardo
mesh_terms: D000818:Animals; D002417:Cattle; D003731:Dental Caries / Q000517:prevention & control*; D003732:Dental Caries Activity Tests; D003733:Dental Caries Susceptibility; D003743:Dental Enamel / Q000528:radiation effects*; D003747:Dental Enamel Solubility; D005459:Fluorides / Q000378:metabolism*; D007834:Lasers; D028022:Low-Level Light Therapy / Q000295:instrumentation*; D008855:Microscopy, Electron, Scanning; D010865:Pilot Projects; D013053:Spectrophotometry / Q000295:instrumentation; D017001:Tooth Demineralization
chemical_list: D005459:Fluorides