Abstract
The aim of this study was to investigate whether distinct cooling of low fluence erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser irradiation would influence adhesion. Main factors tested were: substrates (two), irradiation conditions (three), and adhesives (three). A 750 μm diameter tip was used, for 50 s, 1 mm from the surface, with a 0.25 W power output, 20 Hz, energy density of 2.8 J/cm2 with energy per pulse of 12.5 mJ. When applied, water delivery rate was 11 ml/min. The analysis of variance (ANOVA) showed that laser conditioning significantly decreased the bond strength of all adhesive systems applied on enamel. On dentin, laser conditioning significantly reduced bond strength of etch-and-rinse and one-step self-etch systems; however, laser irradiation under water cooling did not alter bonding of two-step self-etching. It may be concluded that the irradiation with Er,Cr:YSGG laser at 2.8 J/cm2 with water coolant was responsible for a better adhesion to dentin, while enamel irradiation reduced bond strength, irrespective of cooling conditions.
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The authors thank the research support foundation “Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)” for their grants: number 2003/12182-4 and number 2004/02229-6.
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Botta, S.B., da Ana, P.A., Zezell, D.M. et al. Adhesion after erbium, chromium:yttrium-scandium-gallium-garnet laser application at three different irradiation conditions. Lasers Med Sci 24, 67–73 (2009). https://doi.org/10.1007/s10103-007-0521-3
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DOI: https://doi.org/10.1007/s10103-007-0521-3