Department of Operative Dentistry, School of Dentistry, University of São Paulo, 2227 Professor Lineu Prestes, São Paulo, SP, 05508-000, Brazil.
Department of Maxillofacial Surgery, Prosthesis and Traumatology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil.
Lasers Med Sci. 2021 Mar;36(2):311-315. doi: 10.1007/s10103-020-03030-1. Epub 2020 May 6.
Biosafety materials used in the correct handling of low power laser equipment may interfere on the power delivered at the target tissue and, possibly, on the effects on biological tissues. The aim of this study was to evaluate the interference of the use of polyvinyl chloride (PVC) and polyethylene (PEAD) protection materials on the output power of low power lasers. Two low power diode laser devices with different wavelengths (red and infrared) were used. For each wavelength, two protection materials and two evaluation times (before and after protection) were considered. The output power (mW) was measured with the tip positioned in close contact with the power meter receiver. Parametric statistical test, two-way ANOVA for repeated measures (protection material and time), was performed considering the level of significance of 5%. In respect to "time", all groups had the output power reduced after placing the protective material (p < 0.05). Comparing the protection materials, the PEAD showed a greater reduction in output power than the PVC for both red and infrared wavelengths. It was concluded that, among the biosafety materials tested, PVC is the most suitable for the protection of the tip of the low power lasers.
在正确处理低功率激光设备时使用的生物安全材料可能会干扰目标组织接收到的功率，并且可能会影响生物组织的效果。本研究旨在评估聚氯乙烯（PVC）和聚乙烯（PEAD）保护材料对低功率激光器输出功率的干扰。使用了两种具有不同波长（红色和红外线）的低功率二极管激光设备。对于每个波长，考虑了两种保护材料和两种评估时间（保护前后）。通过将探头放置在靠近功率计接收器的位置来测量输出功率（mW）。采用保护材料和时间的双向重复测量方差分析（two-way ANOVA for repeated measures）进行参数统计检验，考虑到 5%的显着性水平。关于“时间”，放置保护材料后，所有组的输出功率均降低（p <0.05）。比较保护材料，PEAD 比 PVC 对红色和红外线的输出功率降低更大。因此，在所测试的生物安全材料中，PVC 是最适合低功率激光器探头保护的材料。
