Post-treatment with high-power lasers to improve bond strength of adhesive systems to bleached dentin

Author(s)

Souza-Gabriel, Aline Evangelista ; Curylofo-Zotti, Fabiana Almeida ; Scatolin, Renata Siqueira ; Milori Corona, Silmara Aparecida

• Document type: Journal article
• Source: JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY; v. 31, n. 17, p. 1888-1899, 2017.
• Web of Science Citations: 0

Abstract

To assess the effect of Er:YAG and diode lasers on the shear bond strength (SBS) of adhesive systems to bovine dentin submitted to bleaching with a high concentration agent. One hundred and twenty bovine dentin fragments were used. Fragments were distributed into 12 groups (n=10) considering the bleaching (present or not), surface post-treatment (untreated, Er:YAG laser or diode laser) and adhesive system (total-etching or self-etching). Specimens received two applications of 38% hydrogen peroxide. Er:YAG laser (2940nm, 200mJ, 4Hz) and diode laser (980nm, 1.5W) were applied for 15 s on bleached dentin surface. Restoration was performed with resin using split matrix. Specimens were submitted to SBS test and data (MPa) were analyzed by ANOVA and Tukey's test (=0.05). SBS of bleached specimens decreased in comparison with non-bleached (p<0.05). The highest values were obtained for the post-treatment with Er:YAG laser (p<0.05). Total-etching adhesive was superior to self-etching system (p<0.05). The irradiation of bleached dentin with Er:YAG laser followed by the application of the total-etching adhesive had similar SBS to unbleached dentin with no post-treatment (control) (p>0.05). Er:YAG laser post-treatment followed by the total-etching adhesive system improve the bond strength of restorative material to bleached dentin. (AU)

• FAPESP's process: 14/08751-8 - Impact of antioxidant solutions or laser irradiation on bleached dentin after artificial aging of the adhesive interface
• Grantee: Aline Evangelista de Souza Gabriel
• Support type: Regular Research Grants