SILVA, VILMARA R.M. daVIANA, ITALLO E.L.LOPES, RAQUEL M.ZEZELL, DENISE M.SCARAMUCCI, TAISARANHA, ANA C.C.2019-05-072019-05-072019SILVA, VILMARA R.M. da; VIANA, ITALLO E.L.; LOPES, RAQUEL M.; ZEZELL, DENISE M.; SCARAMUCCI, TAIS; ARANHA, ANA C.C. Effect of Er,Cr:YSGG laser associated with fluoride on the control of enamel erosion progression. <b>Archives of Oral Biology</b>, v. 99, p. 156-160, 2019. DOI: <a href="https://dx.doi.org/10.1016/j.archoralbio.2019.01.011">10.1016/j.archoralbio.2019.01.011</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/29873.0003-9969http://repositorio.ipen.br/handle/123456789/29873Objective: To evaluate the effect of Er,Cr:YSGG laser associated or not with acidulated phosphate fluoride (APF) on the control of enamel erosion progression. Design: Enamel slabs (4mm×4mm×2 mm) from bovine incisors were flattened, polished, and received a tape on their test surfaces, leaving a 4mm×1mm area exposed. Specimens were eroded (10 min in 1% citric acid solution) and randomly assigned into 8 experimental groups (n=10): Control (no treatment); F (APF gel, 1.23% F, pH 3.6–3.9); Er,Cr:YSGG laser irradiation (P1: 0.25 W, 20 Hz, 2.8 J/cm2, 56 W/cm2); Er,Cr:YSGG laser irradiation (P2: 0.50 W, 20 Hz, 5.7 J/cm2, 1136 W/cm2); Er,Cr:YSGG laser irradiation (P3: 0.75 W, 20 Hz, 8.5 J/cm2, 1704 W/cm2); F+Laser P1; F+Laser P2; F+Laser P3. Specimens were then subjected to erosive cycling (5 min immersion in 0.3% citric acid solution, followed by immersion in artificial saliva for 60 min; 4×/day for 5 days). At the end of cycling, surface loss (SL, in μm) was determined with optical profilometry. Selected specimens were further evaluated by environmental scanning electron microscopy (n=3). Data were analyzed using Kruskal-Wallis and Tukey tests (α=0.05). Results: Group F+Laser P2 had the lowest SL value, differing significantly from the control; however, with no significant difference from the other groups. All groups, except F+Laser P2, showed no significant difference in SL when compared with the control. An irregular and rough surface, suggestive of a melting action of laser, was observed on enamel in Laser P2 and F+Laser P2 groups. Conclusions: Association of the Er,Cr:YSGG laser in parameter 2 with fluoride was the only treatment capable of controlling the progression of enamel erosion.156-160openAccessfluoridesteethdentistryerosion controlenamelsoptical systemslaser radiationArtigo de periódico9910.1016/j.archoralbio.2019.01.011https://orcid.org/0000-0001-7404-960659.89063.67