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Quintessence Publishing: Journals: JOLA


The Journal of Oral Laser Applications

Edited by Prof Dr Andreas Moritz and Prof G. Lynn Powell

Official publication of the European Society for Oral Laser Applications

ISSN (print) 1473-7809 • ISSN (online) 1867-5611

Summer 2004
Volume 4 , Issue 2

Pages: 83-88
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In Vitro Bonding to Nd: YAG Laser-treated Dentin

Re, Dino/Augusti, Davide/Salina, Sergio/Cerutti, Antonia/Amatu, Silvio/Maiorana, Carlo

Purpose: This study examined the shear bond strength of three different adhesive systems to untreated and Nd:YAG laser-treated dentin. Materials and Methods: Sixty freshly extracted noncarious human molars were ground to expose middle dentin, which was polished down to 600 grit. Half of the samples were prepared with an Nd:YAG laser for 20 s at 10 Hz and 80 mJ (laser group); the other half was maintained as a control (control group). Three dentin adhesive systems were applied according to manufacturer’s instructions to the laser-irradiated surfaces and to the control surfaces: Scotchbond Multi-Purpose (SBM), Scotchbond 1 (SB1), and Adper Prompt L-Pop (LP); for SBM and SB1, the dentin surface was etched with 35% phosphoric acid gel for 15 s. A 5-mm-diameter metal ring was used to set the resin composite (Z100), and specimens were stored in water at 37°C for 24 h. Shear bond strength (SBS) was evaluated by means of a universal testing machine with a crosshead speed of 1 mm/min. The results were statistically analyzed with two-way ANOVA and Fisher’s PLSD test (p < 0.05). Results: The bond strength of the control group was significantly higher than that of the laser group (p < 0.05). SBM obtained the highest SBS values in the control group while LP showed the highest in the laser group. Conclusion: Nd:YAG laser irradiation adversely affect adhesion to dentin for all three different dentin adhesive systems tested in this investigation.

Keywords: Nd:YAG laser, dentin, adhesion, shear bond strength, etching

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