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Er:YAG Laser Activation of Sodium Hypochlorite for Root Canal Soft Tissue Dissolution
Author(s) -
Kuhn Katharina,
Rudolph Heike,
Luthardt Ralph G.,
Stock Karl,
Diebolder Rolf,
Hibst Raimund
Publication year - 2013
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.22143
Subject(s) - sodium hypochlorite , root canal , laser , materials science , dentistry , dissolution , soft tissue , biomedical engineering , chemistry , medicine , surgery , optics , physics , organic chemistry
Background and Objective The aim of this in vitro study was to investigate the effect of Er:YAG laser irradiation on the ability of sodium hypochlorite (NaOCl) to dissolve soft tissue during endodontic procedures. Materials and Methods Two acrylic glass plates, each containing a semi‐canal, were bolted together to form a complete canal. This geometry permitted one semi‐canal to be filled with fine liver sausage of bovine origin dyed by methylene blue and the other with NaOCl (4.00–4.99% available chlorine; Sigma–Aldrich Corporation, St. Louis, MA), which was then activated by Er:YAG laser irradiation (KEY Laser 3; KaVo, Biberach, Germany) using a plain‐ended fiber tip and a range of output energy and repetition rate. To achieve relatively low output energy from high input energy, the laser beam was attenuated by placing glass slides in the beam path. The resultant images acquired were analyzed using pixel‐based analysis. Samples were statistically analyzed (two‐way ANOVA, P < 0.05, univariate, bifactorial; IBM SPSS Statistics 19, SPSS Inc., Chicago, IL). Results Both output energy and repetition rate significantly influenced the tissue dissolution ability of NaOCl ( P < 0.05). Conclusion Within the limitations of this in vitro study, we conclude that laser activation of NaOCl at 200 mW output power leads to effective soft tissue dissolution. This finding can be of use to endodontists pursuing effective soft tissue dissolution from their irrigants. Lasers Surg. Med. 45:339–344, 2013. © 2013 Wiley Periodicals, Inc.