The Journal of Oral Laser Applications
J Oral Laser Applications 9 (2009), No. 2-3     15. Oct. 2009
J Oral Laser Applications 9 (2009), No. 2-3  (15.10.2009)

Page 117-120

Effect of Nd:YAG Laser on the Shear Bond Strength of Composite to Dentin
Shahabi, Sima / Kharazifar, M. J.
Purpose: This study was conducted to investigate the surface effects on dentin following laser "etching" with an Nd:YAG laser, and to determine the shear bond strengths of composite to untreated and laser-treated dentin.
Materials and Methods: Dentin surfaces from freshly extracted permanent molars were subjected to laser treatment with an Nd:YAG laser. The results were analyzed using an SPSS/PC multiple range test. The shear bond strengths of laser-treated dentin/composite and untreated dentin/composite by dentin bonding were also determined. These results were also compared using the SPSS/PC multiple range test.
Results: Shear bond strength in laser and acid groups were 6.70 ± 2.86 and 15.24 ± 8.51 MPa, respectively. Bond strength in the laser group was significantly lower than in the other group (p < 0.01).
Conclusion: The Nd:YAG dental laser tested produced weaker shear bond strength than conventional acid etching.

Keywords: shear bond, dentin, Nd:YAG laser