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20 January 2015 Intrapulpal temperature changes during root surface irradiation with dual-wavelength laser (2780 and 940 nm): in vitro study
Rene Franzen, Borna Rashidisangsary, Seda Ozturan, Leon Vanweersch, Norbert Gutknecht
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Journal of Biomedical Optics, Vol. 20, Issue 1, 018002 (January 2015). https://doi.org/10.1117/1.JBO.20.1.018002
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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2015/$25.00 © 2015 SPIE
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Rene Franzen, Borna Rashidisangsary, Seda Ozturan, Leon Vanweersch, and Norbert Gutknecht "Intrapulpal temperature changes during root surface irradiation with dual-wavelength laser (2780 and 940 nm): in vitro study," Journal of Biomedical Optics 20(1), 018002 (20 January 2015). https://doi.org/10.1117/1.JBO.20.1.018002
Published: 20 January 2015
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KEYWORDS
Semiconductor lasers
Temperature metrology
Teeth
Erbium lasers
Diodes
Er:YAG lasers
In vitro testing
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