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Enamel demineralization and bracket bond strength when etching with acid and /or Er:YAG laser
Author(s) -
Lasmar MF,
Reher VGS,
Lalloo R,
Reher P
Publication year - 2012
Publication title -
australian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.701
H-Index - 71
eISSN - 1834-7819
pISSN - 0045-0421
DOI - 10.1111/j.1834-7819.2012.01679.x
Subject(s) - demineralization , phosphoric acid , bond strength , enamel paint , laser , ultimate tensile strength , hydrofluoric acid , materials science , dentistry , nuclear chemistry , chemistry , composite material , adhesive , metallurgy , medicine , optics , physics , layer (electronics)
Background: Enamel etching for brackets is usually done with phosphoric acid. Er:YAG lasers have been recently used for this purpose with conflicting results. The effects of lasers on tooth demineralization and the effects of different combinations of laser treatments and bonding agents were evaluated in this study. Methods: The enamel contents of fluorine, calcium oxide and phosphorus pentoxide (P 2 O 5 ) were analysed using acid etching, laser treatment or both. The tensile bond strength of metallic and ceramic brackets using Transbond ® XT and Fuji Ortho ® LC were also tested, using acid etching, laser treatment or a combination of both. Results: All treatments reduced the contents of fluorine, P 2 O 5 and calcium oxide, and acid reduced P 2 O 5 levels more than laser. The bond strength with laser was weaker than with acid, and stronger when combining both. When using laser, the best adhesive was the Fuji Ortho ® LC. The combination of laser and acid produced the best results when using Transbond ® XT. Conclusions: The demineralization promoted by laser was lower than the one produced with acid. Laser treatment produced lower tensile stress strength than acid, but still enough to produce clinically efficient retention. The combination of laser and acid produced the best retention results.