de Godoy Camila Haddad Leal, Motta Lara Jansiski, Steagall Júnior Washington, Gonçalves Marcela Leticia Leal, Teixeira da Silva Daniela Fátima, Mesquita-Ferrari Raquel Agnelli, Brugnera Júnior Aldo, Bussadori Sandra Kalil
1 Postgraduate Program in Rehabilitation Sciences, Universidade Nove de Julho (UNINOVE) , São Paulo, Brazil .
2 National Institute of Science and Technology , INCT "Basic Optics Applied to Life Sciences," IFSC, USP, São Carlos, Brazil .
Photomed Laser Surg. 2018 Jul;36(7):370-376. doi: 10.1089/pho.2017.4396. Epub 2018 May 16.
This is a randomized, sham-controlled, blind clinical trial that aimed to evaluate the effect of phototherapy on bite force, mandibular range of motion, sensitivity to palpation, and fatigue in the masseter and anterior temporal muscles of young patients when administered before the induction of fatigue.
Fifty-two healthy volunteers aged 18-23 years were randomly allocated to a laser group and sham group. Both groups were submitted to a clinical evaluation to record mandibular range of motion, bite force, muscle sensitivity to palpation, and muscle fatigue. The laser group was then submitted to phototherapy (780 nm, 25 J/cm, 50 mW, 20 sec, and 1 J per point) on three points of the masseter and one point of the anterior temporal muscle on each side. The sham group was submitted to the same procedure, but with the device switched off. The volunteers were then instructed to chew two pieces of gum (one on each side) for 6 min, with the pace set by a metronome calibrated to 80 bpm, followed by the reevaluation of all variables. The results were submitted to t-test and Wilcoxon test. A significance level of 5% (p < 0.05) was considered in all analyses.
No statistically significant intergroup or intragroup differences were found for the variables analyzed.
With the proposed protocol, phototherapy administered before the induction of fatigue did not lead to any changes in bite force and mandibular range of motion, indicating that further studies are needed with different phototherapy dosimetric parameters.
这是一项随机、假对照、盲法临床试验，旨在评估在诱发疲劳前给予光疗对年轻患者咬合力、下颌运动范围、触诊敏感度以及咬肌和颞前肌疲劳的影响。
52名年龄在18至23岁之间的健康志愿者被随机分配到激光组和假治疗组。两组均接受临床评估，以记录下颌运动范围、咬合力、肌肉触诊敏感度和肌肉疲劳情况。然后，激光组在每侧咬肌的三个点和颞前肌的一个点接受光疗（780纳米，25焦耳/平方厘米，50毫瓦，20秒，每点1焦耳）。假治疗组接受相同的操作，但设备关闭。随后，志愿者被要求咀嚼两片口香糖（每侧一片）6分钟，节奏由校准为80次/分钟的节拍器设定，之后对所有变量进行重新评估。结果进行t检验和威尔科克森检验。所有分析中显著性水平设定为5%（p < 0.05）。
所分析的变量在组间和组内均未发现具有统计学意义的差异。
按照所提出的方案，在诱发疲劳前给予光疗并未导致咬合力和下颌运动范围出现任何变化，这表明需要采用不同的光疗剂量参数进行进一步研究。
