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Journal of Biomedical Optics

Intrapulpal temperature changes during root surface irradiation with dual-wavelength laser (2780 and 940 nm): in vitro study
Author(s): Rene Franzen; Borna Rashidisangsary; Seda Ozturan; Leon Vanweersch; Norbert Gutknecht
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Paper Abstract

The present study evaluated the intrapulpal thermal changes that occurred during the treatment of the root surfaces with a laser system emitting Er,Cr:YSGG 2780- and 940-nm diode laser irradiation in an alternating sequence. Thirty single-rooted human teeth were collected. The teeth were divided into three groups (n=10 each) and irradiated with Er,Cr:YSGG alone or combined with a 940-nm diode laser. To investigate the intrapulpal temperature changes, specimens were embedded in a resin block with a set of thermocouples introduced at different positions within the root canals. The first group was irradiated with only Er,Cr:YSGG (25 mJ, 50 Hz, 50  μs pulse duration, water and air spray); the second group was irradiated with Er,Cr:YSGG (same setting) and a 940-nm diode (2 W, chopped mode with 20% duty cycle); the third group was irradiated with Er,Cr:YSGG (same setting) and a diode (2 W, chopped mode with 50% duty cycle). During all irradiations, thermal changes were recorded in real time with thermocouples. While group 3 showed thermal rises on average of 1.68±0.98°C in the pulp chamber, groups 1 and 2 showed average temperature rises of <0.5°C. The combined laser emission of 2780 and 940 nm is a promising way for root surface debridement without inducing intrapulpal thermal damage when using an appropriate water/air spray. All measured temperatures were considerably below the critical value of 5.6°C.

Paper Details

Date Published: 20 January 2015
PDF: 6 pages
J. Biomed. Opt. 20(1) 018002 doi: 10.1117/1.JBO.20.1.018002
Published in: Journal of Biomedical Optics Volume 20, Issue 1
Show Author Affiliations
Rene Franzen, RWTH Aachen Univ. Hospital (Germany)
Borna Rashidisangsary, RWTH Aachen Univ. Hospital (Germany)
Seda Ozturan, Biruni Univ. (Turkey)
Leon Vanweersch, RWTH Aachen Univ. Hospital (Germany)
Norbert Gutknecht, RWTH Aachen Univ. Hospital (Germany)

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