Caries inhibition of simulated active caries lesions with CO2 laser irradiation and fluoride

John Tressel; Filipp Kashirtsev; Kevin Cheung; Jacob Simon; Daniel Fried

doi:10.1117/12.2608308

4 March 2022 Caries inhibition of simulated active caries lesions with CO₂ laser irradiation and fluoride

John Tressel, Filipp Kashirtsev, Kevin Cheung, Jacob Simon, Daniel Fried

Proceedings Volume 11942, Lasers in Dentistry XXVIII; 119420B (2022) https://doi.org/10.1117/12.2608308
Event: SPIE BiOS, 2022, San Francisco, California, United States

Abstract

It has been well established that CO₂ laser irradiation can be used to transform the mineral phase of dental enamel to make it more resistant to acid dissolution. The purpose of this study was to investigate if carbon dioxide laser irradiation and topical fluoride can be used to treat incipient caries lesions to inhibit further progression, i.e. treat active lesion surfaces as opposed to sound surfaces prior to subjecting them to an acid challenge. Simulated active caries lesions were produced on twenty eight bovine enamel samples using a pH cycling model and those surfaces were irradiated by a 9.4 μm CO₂laser and treated with topical fluoride. Changes in the surface morphology, acid resistance, and permeability were measured using digital microscopy, optical coherence tomography (OCT), and SWIR reflectance surface dehydration rate measurements at 1950 nm after exposure to a further acid challenge. There was a significant reduction (P < 0.05) of further lesion progression for lesion windows treated with CO₂ laser irradiation followed by the application of an acidulated phosphate fluoride gel compared to the untreated lesion windows on each sample. Treatment by laser irradiation alone was not effective. The degree of lesion inhibition was not as high as has been previously observed for laser irradiated sound enamel surfaces exposed to an acid challenge.

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John Tressel, Filipp Kashirtsev, Kevin Cheung, Jacob Simon, and Daniel Fried "Caries inhibition of simulated active caries lesions with CO₂ laser irradiation and fluoride", Proc. SPIE 11942, Lasers in Dentistry XXVIII, 119420B (4 March 2022); https://doi.org/10.1117/12.2608308

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KEYWORDS

Dental caries

Reflectivity

Optical coherence tomography

Carbon dioxide lasers

Laser irradiation

Laser therapeutics

Gas lasers

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