Evaluation of enamel surface modification using PS-OCT after laser treatment to increase resistance to demineralization

Jin Wan Kim; Kenneth H. Chan; Daniel Fried

doi:10.1117/12.2218662

29 February 2016 Evaluation of enamel surface modification using PS-OCT after laser treatment to increase resistance to demineralization

Jin Wan Kim, Kenneth H. Chan, Daniel Fried

Author Affiliations +

Proceedings Volume 9692, Lasers in Dentistry XXII; 96920W (2016) https://doi.org/10.1117/12.2218662
Event: SPIE BiOS, 2016, San Francisco, California, United States

Abstract

At laser intensities below ablation, carbonated hydroxyapatite in enamel is converted into a purer phase hydroxyapatite with increased acid resistance. Previous studies suggested the possibility of achieving the conversion without surface modification. This study attempts to evaluate the thresholds for the modification without additional changes in physical and optical properties of the enamel. Bovine specimens were irradiated using an RF-excited CO₂ laser operating at 9.4-μm with a pulse duration of 26- μs, pulse repetition rates of 100-1000 Hz, with a Gaussian spatial beam profile - 1.4 mm in diameter. After laser treatment, the samples were subjected to acid demineralization for 48 hours to simulate acidic intraoral conditions of a caries attack. The resulting demineralization and erosion were assessed using polarization sensitive OCT (PS-OCT) and 3D digital microscopy. The images from digital microscopy demonstrated a clear delineation between laser protected zones without visual changes and zones with higher levels of demineralization and erosion. Distinct changes in the surface morphology were found within the laser treated area in accordance with the Gaussian spatial beam profile. There was significant protection from the laser in areas that were not visually altered.

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Jin Wan Kim, Kenneth H. Chan, and Daniel Fried "Evaluation of enamel surface modification using PS-OCT after laser treatment to increase resistance to demineralization", Proc. SPIE 9692, Lasers in Dentistry XXII, 96920W (29 February 2016); https://doi.org/10.1117/12.2218662

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