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Proceedings Paper

The influence of pulse duration on the bond strength of dentin to composite after Er:YAG laser irradiation
Author(s): Charles Q. Le; Michal Staninec; Daniel Fried
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Paper Abstract

Last year we demonstrated that thermal damage to dentin could be minimized by using Q-switched Er:YSGG laser pulses shorter than the thermal relaxation time of the deposited laser energy in conjunction with a layer of water added to the tissue surface before ablation. This resulted in significantly higher bond strengths of composite resin to laser treated dentin surfaces. Unfortunately, Q-switched erbium laser pulses cause strong acoustic effects and sound waves that are potentially irritating to the clinician and patient. The objective of this study was to investigate the influence of slightly longer Er:YAG laser pulses that avoid the undesirable acoustic effects on the bond strength of composite to laser prepared dentin surfaces. The surfaces of human dentin samples were irradiated by Er:YAG lasers operating with pulse durations of 0.5-μs, 20-μs, and 200-μs. A motion control system and a pressurized spray system incorporating a microprocessor controlled pulsed nozzle for water delivery, were used to ensure uniform treatment of the entire surface. Shear bond testing was used to evaluate the adhesive strength in order to assess the suitability of laser treated surfaces for bonding. High bond strengths with minimal peripheral thermal damage were achieved using 20-30μs Er:YAG laser pulses.

Paper Details

Date Published: 23 March 2005
PDF: 6 pages
Proc. SPIE 5687, Lasers in Dentistry XI, (23 March 2005); doi: 10.1117/12.604556
Show Author Affiliations
Charles Q. Le, Univ. of California/San Francisco (United States)
Michal Staninec, Univ. of California/San Francisco (United States)
Daniel Fried, Univ. of California/San Francisco (United States)

Published in SPIE Proceedings Vol. 5687:
Lasers in Dentistry XI
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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