Visualization of irrigant flow and cavitation induced by Er:YAG laser within a root canal model

Himeka Matsumoto, Yoshimine Yoshito, Akifumi Akamine

Research output: Contribution to journalArticle

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Abstract

Introduction: Laser-activated irrigation (LAI) has recently been introduced as an innovative method for root canal irrigation. However, there is limited information about the cleaning mechanism of an Er:YAG laser. In this study, we visualized the action of laser-induced bubbles and fluid flow in vitro to better understand the physical mechanisms underlying LAI. Methods: An Er:YAG laser was equipped with a novel cone-shaped tip with a lateral emission rate of approximately 80%. Laser light was emitted at a pulse energy of 30, 50, or 70 mJ (output energy: 11, 18, or 26 mJ) and a repetition rate of 1 or 20 pulses per second, without air or water spray. Fluid flow dynamics in a root canal model were observed by using glass-bead tracers under a high-speed camera. Moreover, laser-induced bubble patterns were visualized in both free water and the root canal model. Results: Tracers revealed high-speed motion of the fluid. A full cycle of expansion and implosion of vapor and secondary cavitation bubbles were clearly observed. In free water, the vapor bubble expanded for 220 microseconds, and its shape resembled that of an apple. In the root canal model, the vapor bubble expanded in a vertical direction along the canal wall, and bubble expansion continued for ≥700 microseconds. Furthermore, cavitation bubbles were created much more frequently in the canal model than in free water. Conclusions: These results suggest that the cleaning mechanism of an Er:YAG laser within the root canal might depend on rapid fluid motion caused by expansion and implosion of laser-induced bubbles.

Original languageEnglish
Pages (from-to)839-843
Number of pages5
JournalJournal of Endodontics
Volume37
Issue number6
DOIs
Publication statusPublished - Jun 1 2011

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Dental Pulp Cavity
Solid-State Lasers
Lasers
Water
Malus
Hydrodynamics
Glass
Air
Light

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

Cite this

Visualization of irrigant flow and cavitation induced by Er:YAG laser within a root canal model. / Matsumoto, Himeka; Yoshito, Yoshimine; Akamine, Akifumi.

In: Journal of Endodontics, Vol. 37, No. 6, 01.06.2011, p. 839-843.

Research output: Contribution to journalArticle

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