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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

Publication:
JOLA
Fall 2005
Volume 5 , Issue 3

Pages: 161-167
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Nd:YAG Laser Influence on Dentin Bond Strength of Three Different Adhesive Systems

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

Purpose: This study examined the effects of Nd:YAG laser irradiation on the shear bond strength of three different adhesive systems. Materials and Methods: Thirty freshly extracted noncarious human molars were ground to expose middle dentin, which was polished down to 600 grit. Specimens were separated into 6 subgroups (n = 5) and received the following treatments: (C1) Prime&Bond NT as indicated by manufacturer; (C2) Xeno III as indicated by manufacturer; (C3) Tyrian SPE One Step Plus as indicated by manufacturer; (L1) Prime&Bond NT + laser; (L2) Xeno III + laser; (L3) Tyrian SPE One Step Plus + laser. Nd:YAG laser was used in noncontact mode at 15 Hz and 40 mJ for 30 s. A standard 5-mm-diameter composite resin cylinder (Synergy, Coltene) was bonded to the dentinal surface, and specimens were then stored in water at 37C 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 by two-way ANOVA and the Student’s t test (p < 0.05). Results: The bond strength of the control group was significantly higher than that of the laser group (p < 0.05). Xeno III obtained the highest SBS values in the laser group, while Prime&Bond NT showed the highest values in the control group. Conclusion: Nd:YAG laser irradiation adversely affected adhesion to dentin for all three different dentin adhesive systems tested in this study.

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

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