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Proceedings Paper

Assessment of radicular dentin permeability after irradiation with CO2 laser and endodontic irrigation treatments with thermal imaging
Author(s): Heajin Cho; Robert C. Lee; Kenneth H. Chan; Daniel Fried
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Paper Abstract

Previous studies have demonstrated that the permeability changes due to the surface modification of dentin can be quantified via thermal imaging during dehydration. The CO2 laser has been shown to remove the smear layer and disinfect root canals. Moreover, thermal modification via CO2 laser irradiation can be used to convert dentin into a highly mineralized enamel-like mineral. The purpose of this study is to evaluate the radicular dentin surface modification after CO2 laser irradiation by measuring the permeability with thermal imaging. Human molar specimens (n=12) were sectioned into 4 axial walls of the pulp chamber and treated with either 10% NaClO for 1 minute, 5% EDTA for 1 minute, CO2 laser or none. The CO2 laser was operated at 9.4 μm with a pulse duration of 26 μs, pulse repetition rate of 300 Hz and a fluence of 13 J/cm2. The samples were dehydrated using an air spray for 60 seconds and imaged using a thermal camera. The resulting surface morphological changes were assessed using 3D digital microscopy. The images from digital microscopy confirmed melting of the mineral phase of dentin. The area enclosed by the time-temperature curve during dehydration, ▵Q, measured with thermal imaging increased significantly with treatments with EDTA and the CO2 laser (P<0.05). These results indicate that the surface modification due to CO2 laser treatment increases permeability of radicular dentin.

Paper Details

Date Published: 8 February 2017
PDF: 5 pages
Proc. SPIE 10044, Lasers in Dentistry XXIII, 100440K (8 February 2017); doi: 10.1117/12.2256735
Show Author Affiliations
Heajin Cho, Univ. of California, San Francisco (United States)
Robert C. Lee, Univ. of California, San Francisco (United States)
Kenneth H. Chan, Univ. of California, San Francisco (United States)
Daniel Fried, Univ. of California, San Francisco (United States)

Published in SPIE Proceedings Vol. 10044:
Lasers in Dentistry XXIII
Peter Rechmann; Daniel Fried, Editor(s)

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