Cavitational Effects in Aqueous Endodontic Irrigants Generated by Near-infrared Lasers
Cavitational Effects in Aqueous Endodontic Irrigants Generated by Near-infrared Lasers
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DOI：
10.1016/j.joen.2009.08.012
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发表时间：
2010-02-01
影响因子：
4.2
通讯作者：
Walsh, Laurence James
中科院分区：
文献类型：
--
作者：
Hmud, Raghad;Kahler, William A.;Walsh, Laurence James
简介：激光产生的压力波可能用于去除根管中的碎屑和玷污层。过去的工作采用中红外铒激光器。本研究探讨了近红外940和980 nm二极管激光器（Biolase Ezlase和Sirona Sirolaser，分别）是否可以在水介质中诱导空化。方法：使用200 μ m光纤将激光能量传递到毛细管中，并在显微镜下观察空化的形成。在研究的第一部分中，试验了一系列激光参数，以建立在激光照射开始后5秒内形成空化的条件。研究的第二部分比较了蒸馏水、充气自来水、脱气蒸馏水、臭氧化水、3%和6%过氧化氢中的空化，Sirolaser面板设置为2.5 W/25 Hz，Ezlase面板设置为4 W/10 Hz。结果：两种半导体激光系统都能通过水蒸气的形成和内爆在水基介质中产生空化。激光功率比脉冲频率或脉冲间隔起更重要的作用。最佳的激光引发的空化发生时，弱（3%）的过氧化物溶液被用作目标冲洗液，而不是水。结论：这种现象有可能提高根管治疗中的清创效果。（J Endod 2010;36：275-278）
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 mu m 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. (J Endod 2010;36:275-278)