Effect of an optically thick water layer during 9.6-µm CO2 laser irradiation on caries inhibition

Charles Q. Le; Daniel Fried; Anupama V. Sarma; John D. B. Featherstone

doi:10.1117/12.539291

28 May 2004 Effect of an optically thick water layer during 9.6-μm CO₂ laser irradiation on caries inhibition

Charles Q. Le, Daniel Fried, Anupama V. Sarma, John D. B. Featherstone

Proceedings Volume 5313, Lasers in Dentistry X; (2004) https://doi.org/10.1117/12.539291
Event: Biomedical Optics 2004, 2004, San Jose, CA, United States

Abstract

Previous studies have shown that laser irradiation of dental enamel by a pulsed carbon dioxide laser can inhibit subsequent acid dissolution of the enamel surface. The aim of the present study was to determine the influence of an applied water layer before laser irradiation by a 9.6-μm TEA laser on the dissolution kinetics of the dental enamel surface. Recent studies have shown that residual non-hydroxyapatite particles accumulate on the enamel surface if a water layer is not present before laser irradiation. Such non-hydroxyapatite mineral phases are expected to profoundly influence the surface dissolution rate. Bovine enamel blocks (3x3 mm²) were irradiated at 9.6-μm wavelength with a 5-8 μs pulse duration laser and a fluence of 20 J/cm². A motion control system and a liquid spray system were used to ensure uniform water application and uniform irradiation of the entire enamel surface. Surface acid dissolution profiles following irradiation were acquired with and without the water spray. Dissolution profiles without the water-spray manifested higher initial dissolution rates than the non-irradiated control group, followed by later rates lower than the control group. In contrast, dissolution rates with the applied water layer produced early low dissolution rates, lower than the control group, followed by a more rapid dissolution rate, similar to the control group. This study demonstrates that the application of a water layer before laser irradiation significantly alters the surface dissolution kinetics of dental enamel.

Citation Download Citation

Charles Q. Le, Daniel Fried, Anupama V. Sarma, and John D. B. Featherstone "Effect of an optically thick water layer during 9.6-μm CO₂ laser irradiation on caries inhibition", Proc. SPIE 5313, Lasers in Dentistry X, (28 May 2004); https://doi.org/10.1117/12.539291

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