de Moraes Maia Mila Leite, Ribeiro Maria Amália Gonzaga, Maia Luiz Guilherme Martins, Stuginski-Barbosa Juliana, Costa Yuri Martins, Porporatti André Luís, Conti Paulo César Rodrigues, Bonjardim Leonardo Rigoldi
Health Science Program, Federal University of Sergipe, Sergipe, Brazil.
Lasers Med Sci. 2014 Jan;29(1):29-35. doi: 10.1007/s10103-012-1228-7. Epub 2012 Nov 10.
This study investigated the effect of low-level laser therapy (LLLT) on the masticatory performance (MP), pressure pain threshold (PPT), and pain intensity in patients with myofascial pain. Twenty-one subjects, with myofascial pain according to Research Diagnostic Criteria/temporomandibular dysfunction, were divided into laser group (n = 12) and placebo group (n = 9) to receive laser therapy (active or placebo) two times per week for 4 weeks. The measured variables were: (1) MP by analysis of the geometric mean diameter (GMD) of the chewed particles using Optocal test material, (2) PPT by a pressure algometer, and (3) pain intensity by the visual analog scale (VAS). Measurements of MP and PPT were obtained at three time points: baseline, at the end of treatment with low-level laser and 30 days after (follow-up). VAS was measured at the same times as above and weekly throughout the laser therapy. The Friedman test was used at a significance level of 5% for data analysis. The study was approved by the Ethics Committee of the Federal University of Sergipe (CAAE: 0025.0.107.000-10). A reduction in the GMD of crushed particles (p < 0.01) and an increase in PPT (p < 0.05) were seen only in the laser group when comparing the baseline and end-of-treatment values. Both groups showed a decrease in pain intensity at the end of treatment. LLLT promoted an improvement in MP and PPT of the masticatory muscles.
本研究调查了低强度激光疗法（LLLT）对肌筋膜疼痛患者咀嚼性能（MP）、压痛阈值（PPT）和疼痛强度的影响。根据研究诊断标准/颞下颌关节紊乱症，选取21例患有肌筋膜疼痛的受试者，分为激光组（n = 12）和安慰剂组（n = 9），每周接受两次激光治疗（活性或安慰剂），共4周。测量的变量包括：（1）使用Optocal测试材料通过分析咀嚼颗粒的几何平均直径（GMD）来评估MP；（2）使用压力痛觉计测量PPT；（3）通过视觉模拟量表（VAS）评估疼痛强度。在三个时间点测量MP和PPT：基线、低强度激光治疗结束时以及治疗后30天（随访）。在上述相同时间以及整个激光治疗期间每周测量VAS。采用Friedman检验进行数据分析，显著性水平为5%。本研究经塞尔希培联邦大学伦理委员会批准（CAAE：0025.0.107.000 - 10）。比较基线值和治疗结束值时，仅激光组的碾碎颗粒GMD降低（p < 0.01）且PPT升高（p < 0.05）。两组在治疗结束时疼痛强度均有所降低。低强度激光疗法促进了咀嚼肌MP和PPT的改善。
