Shirani Amir Mansour, Gutknecht Norbert, Taghizadeh Mahshid, Mir Maziar
Department of Oral Medicine, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Lasers Med Sci. 2009 Sep;24(5):715-20. doi: 10.1007/s10103-008-0624-5. Epub 2008 Nov 12.
Myofacial pain dysfunction syndrome (MPDS) is the most common reason for pain and limited function of the masticatory system. The effects of low-level lasers (LLLs) for controlling the discomfort of patients are investigated frequently. However, the aim of this study was to evaluate the efficacy of a particular source producing 660 nm and 890 nm wavelengths that was recommended to reduce of the pain in the masticatory muscles. This was a double-blind and placebo-controlled trial. Sixteen MPDS patients were randomly divided into two groups. For the laser group, two diode laser probes (660 nm (nanometers), 6.2 J/cm(2), 6 min, continuous wave, and 890 nm, 1 J/cm(2) (joules per square centimetre), 10 min, 1,500 Hz (Hertz)) were used on the painful muscles. For the control group, the treatment was similar, but the patients were not irradiated. Treatment was given twice a week for 3 weeks. The amount of patient pain was recorded at four time periods (before and immediately after treatment, 1 week after, and on the day of complete pain relief). A visual analog scale (VAS) was selected as the method of pain measurement. Repeated-measures analysis of variance (ANOVA), the t-test and the paired t-test were used to analyze the data. In each group the reduction of pain before and after the treatment was meaningful, but, between the two groups, low-level laser therapy (LLLT) was more effective (P = 0.031) According to this study, this type of LLLT was the effective treatment for pain reduction in MPDS patients.
肌筋膜疼痛功能障碍综合征（MPDS）是咀嚼系统疼痛和功能受限的最常见原因。低强度激光（LLLs）对控制患者不适的效果经常被研究。然而，本研究的目的是评估一种推荐用于减轻咀嚼肌疼痛的特定660纳米和890纳米波长光源的疗效。这是一项双盲、安慰剂对照试验。16名MPDS患者被随机分为两组。激光组在疼痛肌肉上使用两个二极管激光探头（660纳米，6.2焦耳/平方厘米，6分钟，连续波，以及890纳米，1焦耳/平方厘米，10分钟，1500赫兹）。对照组的治疗方式类似，但患者不接受照射。治疗每周进行两次，共3周。在四个时间段（治疗前、治疗后即刻、治疗后1周以及疼痛完全缓解当天）记录患者的疼痛程度。选择视觉模拟量表（VAS）作为疼痛测量方法。使用重复测量方差分析（ANOVA）、t检验和配对t检验来分析数据。每组治疗前后疼痛减轻均有意义，但两组之间，低强度激光疗法（LLLT）更有效（P = 0.031）。根据本研究，这种类型的LLLT是减轻MPDS患者疼痛的有效治疗方法。
