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An Invitro Study on The Temperature Changes of Dentin, Irradiated by CO2 and Er: Cr;YSGG Laser

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Author(s): Mohammad Asnaashari | Reza Fekrazad | Mohammad Ali Mozayeni | Maryam Mozayeni

Journal: Journal of Lasers in Medical Sciences
ISSN 2008-9783

Volume: 1;
Issue: 1;
Start page: 1;
Date: 2011;
Original page

Keywords: Keywords: Dentin | Temperature | Co2 lasers | Er | Cr | YSGG | Dental pulp | Dentin Sensitivity

ABSTRACT
Abstract Introuduction: The aim of this in-vitro study was the evaluation of temperature changes due to irradiation of two different lasers used for the reduction of dentinal hypersensitivity and their effect on the pulp damage. The study was done for two dentin thicknesses. Material & Methods: Twenty intact extracted third molars were prepared by longitudinal ground sectioning for 1 and 2 mm dentin thicknesses while a thermocouple was positioned at the inner surface of the dentin disk. Thermal evaluation was assessed by a KJT digital thermometer. During the test, the data produced by the thermometer was transferred and logged into a PC via RS232 serial port. CO2 laser (Ultra pulse, 50W, 100μsec, Spot size: 0.5 mm) and Er,Cr;YSGG laser (Free-running pulse mode,0. 25W, 140μsec, 12.50 milli-joules) irradiations were randomly performed upon the dentin surfaces. The collected data was analyzed by two-way ANOVA test. Results: The mean temperature rise in 1mm dentinal thickness was 8.57˚C which was significantly higher than 3.63˚C in 2mm dentin thickness (p
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