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Proceedings Paper

Er:YAG laser ablation of dental enamel: influence of an optically thick water layer on the bond strength to composite resin
Author(s): Daniel Fried; Michal Staninec; John Xie; Colin W. Murphy; Charles Q. Le
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Paper 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.

Paper Details

Date Published: 3 July 2003
PDF: 7 pages
Proc. SPIE 4950, Lasers in Dentistry IX, (3 July 2003); doi: 10.1117/12.482333
Show Author Affiliations
Daniel Fried, Univ. of California/San Francisco (United States)
Michal Staninec, Univ. of California/San Francisco (United States)
John Xie, Univ. of California/San Francisco (United States)
Colin W. Murphy, Univ. of California/San Francisco (United States)
Charles Q. Le, Univ. of California/San Francisco (United States)


Published in SPIE Proceedings Vol. 4950:
Lasers in Dentistry IX
Peter Rechmann; Daniel Fried; Thomas Hennig, Editor(s)

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