Synergistic effect of fluoride and laser irradiation for the inhibition of the demineralization of dental enamel

Raymond Lee; Kenneth H. Chan; Jamison Jew; Jacob C. Simon; Daniel Fried

doi:10.1117/12.2256739

8 February 2017 Synergistic effect of fluoride and laser irradiation for the inhibition of the demineralization of dental enamel

Raymond Lee, Kenneth H. Chan, Jamison Jew, Jacob C. Simon, Daniel Fried

Author Affiliations +

Proceedings Volume 10044, Lasers in Dentistry XXIII; 100440L (2017) https://doi.org/10.1117/12.2256739
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

Both laser irradiation and fluoride treatment alone are known to provide increased resistance to acid dissolution. CO₂ lasers tuned to a wavelength of 9.3 μm can be used to efficiently convert the carbonated hydroxyapatite of enamel to a much more acid resistant purer phase hydroxyapatite (HAP). Further studies have shown that fluoride application to HAP yields fluoroapatite (FAP) which is even more resistant against acid dissolution. Previous studies show that CO₂ lasers and fluoride treatments interact synergistically to provide significantly higher protection than either method alone, but the mechanism of interaction has not been elucidated. We recently observed the formation of microcracks or a “crazed” zone in the irradiated region that is resistant to demineralization using high-resolution microscopy. The microcracks are formed due to the slight contraction of enamel due to transformation of carbonated hydroxyapatite to the more acid resistant pure phase hydroxyapatite (HAP) that has a smaller lattice. In this study, we test the hypothesis that these small cracks will provide greater adhesion for topical fluoride for greater protection against acid demineralization.

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Raymond Lee, Kenneth H. Chan, Jamison Jew, Jacob C. Simon, and Daniel Fried "Synergistic effect of fluoride and laser irradiation for the inhibition of the demineralization of dental enamel", Proc. SPIE 10044, Lasers in Dentistry XXIII, 100440L (8 February 2017); https://doi.org/10.1117/12.2256739

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