Er:YAG laser ablation of dental enamel: influence of an optically thick water layer on the bond strength to composite resin

Daniel Fried; Michal Staninec; John Xie; Colin W. Murphy; Charles Q. Le

doi:10.1117/12.482333

3 July 2003 Er:YAG laser ablation of dental enamel: influence of an optically thick water layer on the bond strength to composite resin

Daniel Fried, Michal Staninec, John Xie, Colin W. Murphy, Charles Q. Le

Author Affiliations +

Proceedings Volume 4950, Lasers in Dentistry IX; (2003) https://doi.org/10.1117/12.482333
Event: Biomedical Optics, 2003, San Jose, CA, United States

Abstract

Several studies have shown that the addition of an optically thick water layer (~1-mm) to the surface of dental enamel before each incident Er:YAG laser pulse, profoundly influences the rate and efficiency of ablation and the resulting surface morphology. In this study, a calibrated syringe pump, and a motion control system were used to uniformly treat areas of the enamel surface. The rate of water delivery that resulted in the most efficient ablation was determined by profiling the resulting laser incisions using optical coherence tomography. In addition, enamel surfaces of 5 x 5 mm² were uniformly treated and the resulting surface morphology was examined using synchrotron radiation-FTIR spectroscopy, and optical and electron microscopy. The influence of the modified surface morphology on the adhesion of composite was also investigated. The shear-bond strength of composite bonded to enamel surfaces irradiated at intensities clinically relevant for caries removal approached values measured for conventional acid etching when the water delivery rate was optimized. This study demonstrates that composite restorative materials can be directly bonded to laser prepared surfaces without the necessity of further surface preparation and acid etching and that the addition of a thick water (~1-mm) prevents the formation of undesirable CaP phases that compromise adhesion to restorative materials.

Citation Download Citation

Daniel Fried, Michal Staninec, John Xie, Colin W. Murphy, and Charles Q. Le "Er:YAG laser ablation of dental enamel: influence of an optically thick water layer on the bond strength to composite resin", Proc. SPIE 4950, Lasers in Dentistry IX, (3 July 2003); https://doi.org/10.1117/12.482333

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