Publication Type:

Journal Article


Photomedicine and laser surgery, Mary Ann Liebert, Inc. 140 Huguenot Street, 3rd Floor New Rochelle, NY 10801 USA, Volume 28, Number 1, p.97–102 (2010)


The aim of this work was to evaluate the effect of KrF excimer laser treatment on the bond strength between dentin and an etch-and-rinse adhesive system.Materials and Methods:Polished dentin surfaces were subjected to the following treatments: (1) 35% phosphoric acid etching for 15 s; (2) laser surface treatment using KrF excimer laser radiation (1 J/cm2); and (3) laser treatment under the same conditions followed by acid etching. After treating the dentin, an etch-and-rinse adhesive (Adper™ Scotchbond™ 1 XT, 3M ESPE) was applied and composite (Esthet-X<sup>®</sup>, Dentsply Caulk, Konstanz, Germany) build-ups were incrementally constructed. After 24 h of water storage at 37°C, 1 mm<sup>2</sup>beams were longitudinally cut from the samples. Microtensile sticks were loaded in tension at a crosshead speed of 0.5 mm/min. Bond strength data were analyzed with one-way ANOVA and the Student–Newman–Keuls test (<em>p</em> &lt; 0.05). The dentin surfaces resulting from each surface treatment and the fracture surfaces originated by the bond-strength tests were observed under a scanning electron microscope.Results:Laser-treated surfaces exhibited a cone-shaped topography with a frank occlusion of dentinal tubules, while acid etching produced a smoother surface with open tubules. Application of 35% phosphoric acid on laser-treated dentin surfaces resulted in the partial dissolution of the surface cones. Mean microtensile bond strengths for acid-etched dentin was significantly higher (33.7 ± 8.7 MPa) than for laser-treated (13.8 ± 5.1 MPa) and laser-treated and etched surfaces (19.7 ± 6.9 MPa). A higher percentage of cohesive failures at the base of the cones occurred in the laser-treated group, whereas mixed failures were predominant on acid-etched samples.Conclusion:The cone-shaped texture produced by treating dentin with KrF laser radiation does not improve the bond strength of the tested etch-and rinse adhesive system when compared to the traditional acid-etching technique.

Cite this Research Publication

S. Eugénio, Osorio, R., Sivakumar, M., Vilar, R., Monticelli, F., and Toledano, M., “Bond Strength of an Etch-and-Rinse Adhesive to KrF Excimer Laser-Treated Dentin”, Photomedicine and laser surgery, vol. 28, pp. 97–102, 2010.