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12.05.2017 | Original Article | Ausgabe 7/2017

Lasers in Medical Science 7/2017

Nd:YAG laser irradiation associated with fluoridated gels containing photo absorbers in the prevention of enamel erosion

Lasers in Medical Science > Ausgabe 7/2017
LGS Pereira, SH Joao-Souza, SJC Bezerra, AB Borges, ACC Aranha, T Scaramucci
Wichtige Hinweise
The original version of this article was revised: The first author name was incorrectly captured. The given name and family name were interchanged. The correct name is shown in the author group section.
An erratum to this article is available at https://​doi.​org/​10.​1007/​s10103-017-2248-0.


This study evaluated the combined effect of Nd:YAG laser irradiation and fluoridated gels containing photo absorbers against enamel erosion. Enamel specimens from bovine teeth were polished, eroded (10 min, with 1% citric acid, pH = 2.6), and randomly allocated into the experimental groups (n = 8), according to the different surface treatments: fluoridated gels (F: 9047 ppm F and F + Sn: 9047 ppm F and 3000 ppm Sn), with or without photo absorbers (E: erythrosine and MB: methylene blue), and associated or not with Nd:YAG laser irradiation (in contact; 0.5 W; 50 mJ; ~41.66 J/cm2; 10 Hz; 40 s; pulse duration of 120 μs). A placebo gel (PLA) associated or not with laser was used as control. All gels had pH = 4.5 and were applied for 2 min. Laser irradiation was performed during gel application. The specimens were then submitted to a 5-day erosion-remineralization cycling model using 0.3% citric acid (pH = 2.6), 4×/day. Enamel surface loss (SL) was analyzed by optical profilometry in the end of the cycling (in μm). Data were analyzed by ANOVA and Tukey tests (α = 0.05). Means (SD) of SL for the groups were the following (different superscript letters imply significant difference among groups): PLA (21.02 ± 1.28)a, PLA + laser (19.20 ± 0.96)ab, laser (17.47 ± 1.50)b, F + Sn + E + laser (13.69 ± 0.62)c, F + E + laser (13.52 ± 1.16)c, F (13.10 ± 1.08)c, F + laser (11.94 ± 1.44)cd, F + Sn + MB + laser (11.90 ± 4.02)cd, F + MB + laser (11.42 ± 1.42)cd, F + Sn (11.12 ± 1.20)cd, and F + Sn + laser (10.35 ± 0.89)d. In conclusion, all fluoridated gels and the Nd:YAG laser irradiation reduced erosion development, but the combination of treatments did not promote further protection. The addition of photo absorbers to the fluoridated gels did not influence the anti-erosive effect of the combination of laser plus fluoridated gels.

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