Abstract
Introduction
Laser-generated pressure waves may have application for removing debris and smear
layers from root canals. Past work has employed middle infrared erbium lasers. The
present study examined whether near infrared 940 and 980 nm diode lasers (Biolase
Ezlase and Sirona Sirolaser, respectively) could induce cavitations in aqueous media.
Methods
Laser energy was delivered into a capillary tube using a 200 μm fiber, and the formation
of cavitations observed with a microscope. In the first part of the study, a range
of laser parameters were trialled to establish conditions which form cavitations within
5 seconds of the commencement of laser irradiation. The second part of the study compared
cavitation in distilled water, aerated tap water, degassed distilled water, ozonated
water, 3 and 6% hydrogen peroxide using panel setting of 2.5 W/25 Hz for the Sirolaser,
and 4 W/10 Hz for the Ezlase.
Results
Both diode laser systems could induce cavitation in water-base media by the formation
and implosion of water vapour. Laser power played a more important role than pulse
frequency or pulse interval. Optimal laser-initiated cavitation occurred when weak
(3%) peroxide solutions were used as the target irrigant, rather than water.
Conclusion
This phenomenon has potential for enhancing debridement in endodontics.
Key Words
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Article info
Publication history
Published online: December 07, 2009
Footnotes
Supported by the National Health and Medical Research Council of Australia and the Dental Board of Queensland.
Identification
Copyright
© 2010 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
