13th World Congress for Laser Dentistry

26-28, April 2012

Barcelona, Spain

Meeting Abstract

Sponsors: World Federation for Laser Dentistry

-  Poster 53

TITLE: In vitro evaluation of the potential of CO2 laser associated to fluorides in inhibiting human enamel erosion.

AUTHORS: Ramos-Oliveira TM, Ramos TM, Esteves-Oliveira M, Eduardo CP, Apel C, Fischer T, Freitas PM.

University of São Paulo (USP), São Paulo, SP/Brazil and RWTH Aachen University, Aachen/Germany

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 May 1;17(Supplement1):S201.

* doi:10.4317/medoral.17643701

http://dx.doi.org/10.4317/medoral.17643701

Abstract

Considering the limited effectiveness of fluoride in protecting dental hard tissues against erosion the aim of the present study was to investigate the potential of the CO₂ laser associated to fluoride agents in inhibiting enamel erosion.

Human enamel samples were obtained and randomly divided into 9 groups (n=11): G1: control (no treatment), G2: softened enamel, G3: APF gel, G4: AmF/NaF gel, G5: SnF solution, G6: CO₂ laser (0.3 J/cm², 15μs, 226 Hz), G7: CO₂ laser+APF gel, G8: CO₂ laser+AmF/NaF gel and G9: CO₂ laser+ SnF solution. After surface treatment, samples were immersed in 1% citric acid (pH 4.0, 3min). Surface microhardness (SMH) (0.49N, 20s) was measured before and after surface softening. The data were statistically analysed by one-way ANOVA model with subsequent pairwise comparisons at 5% significance level.

Groups G4 (403.55±25,00), G3 (396.64±44.96) and G7 (392.86±24.87) presented the highest SMH means after softening with no statistically significant diffe-rence between them. G3, G4, G7 and G8 (374.91±42.06) resulted in significantly higher hardness values than groups G5 (305.53±17.69) and G9 (328.64C±26.87). G6(341.09±23.82) did not result in significant diffe-rences compared to the control group (341.55±35.10).

Within the limits of the present in vitro study, AmF/NaF and APF application (with or without CO₂ laser irradiation previously) have shown a potential to control erosion progression in human dental enamel. (Financial support: CNPq 304198/2010-2 and CAPES(DS).