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

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; 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), PLA + laser (19.20 ± 0.96), laser (17.47 ± 1.50), F + Sn + E + laser (13.69 ± 0.62), F + E + laser (13.52 ± 1.16), F (13.10 ± 1.08), F + laser (11.94 ± 1.44), F + Sn + MB + laser (11.90 ± 4.02), F + MB + laser (11.42 ± 1.42), F + Sn (11.12 ± 1.20), and F + Sn + laser (10.35 ± 0.89). 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.

The Effect of Er:YAG Laser Irradiation Combined With Fluoride Application on the Resistance of Primary and Permanent Dental Enamel to Erosion

“…Many studies have assessed the efficacy of fluoride alone and in combination with other protective measures in the prevention of erosion. 3,24,[39][40][41][42] Laser irradiation alone or combined with fluoride application has also been suggested to increase enamel acid resistance, 31,43 and some studies demonstrated the positive efficacy of Er:YAG laser in increasing enamel resistance against acid attacks and dental caries. 30,31,44 Although both caries and erosion are caused by the demineralization of enamel, their main etiologic factors and mechanism of development are totally different.…”

Erosive tooth wear inhibition by hybrid coatings with encapsulated fluoride and stannous ions

“…The dental erosion cycling was carried out according to a previously described protocol [24]. The specimens were immersed in 4 ml of 0.3% citric acid solution (natural pH of 2.6) for 5 min, without agitation, followed by 60-min exposure to artificial saliva under gentle agitation at 150 rpm [25].…”

Efeito de uma película híbrida experimental aditivada com fluoreto de sódio e cloreto de estanho no desgaste erosivo

“…(pH natural de aproximadamente 2,6), por 10 min. Em seguida as fitas de UPVC foram removidas e os espécimes foram analisados em perfilômetro ótico para certificar que todos os espécimes possuíam lesões padronizadas, entre 2-5 m, para os dois substratos (70,71,116).…”