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IR Spectromicroscopy of Laser Irradiated Dental Hard Tissues

msra(2010)

Cited 25|Views3
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Abstract
Human and bovine dental enamel was irradiated using three laser systems with pulse durations ranging from 3-ns to 200-µs. The pulsed carbon dioxide laser operating at a wavelength of 9.6- µm is primarily absorbed by the tooth mineral, the Er:YAG laser operating at 2.94-µm is absorbed by water, and the frequency tripled Nd:YAG laser operating at 355-nm is absorbed by the protein and lipid in the tooth. Two specific projects are described in this abstract. The first project focused the identification of the calcium phosphate phases that are formed during laser ablation, and the use of water to prevent the accumulation of non-apatite CaP phases on the irradiated surface during CO2 and Er:YAG irradiation. Our recent studies have focused on the resolution of non-apatite calcium phosphate phases that have been deposited around the periphery of the ablation crater during the ablation event1. Such phases are likely formed in the high temperature plasma plume above the sample during ablation. The second project involved the selective removal of protein and lipid from the surface of dental enamel to increase the diffusion of chemical inhibitors of tooth decay such as fluoride for greater efficacy.
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