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

Author(s)

Pereira, L. G. S. ; Joao-Souza, S. H. ; Bezerra, S. J. C. ; Borges, A. B. ; Aranha, A. C. C. ; Scaramucci, T.

• Document type: Journal article
• Source: Lasers in Medical Science; v. 32, n. 7, p. 1453-1459, SEP 2017.
• Web of Science Citations: 3

Abstract

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/cm(2); 10 Hz; 40 s; pulse duration of 120 mu s). 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), 4x/day. Enamel surface loss (SL) was analyzed by optical profilometry in the end of the cycling (in mu m). Data were analyzed by ANOVA and Tukey tests (alpha = 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. (AU)

• FAPESP's process: 14/14055-4 - In situ evaluation of the anti-erosive effect of solutions containing sodium fluoride, stannous chloride and linear chain sodium polyphosphate
• Grantee: Taís Scaramucci Forlin
• Support Opportunities: Regular Research Grants