中文摘要：

目的评估低强度激光（LLLT）治疗颞下颌关节痛的效果。方法将颞下颌关节痛的患者按随机、双盲原则分为激光组（n=21）和对照组（n=21）,每位患者均接受连续6 d、每天1次的激光或假激光治疗。在治疗前、治疗后、治疗后1月、治疗后2月4个时点对患者的疼痛程度、功能状态进行测量和评估。结果 2组中疼痛视觉模拟评分（VAS）随时间变化的幅度差异有统计学意义（P〈0.001）,且激光组评分下降比对照组更多。无痛最大开口度（MVO）、左侧偏动距离（LLE）和右侧偏动距离（RLE）随时间变化的幅度差异有统计学意义,激光组中各指标值上升更快。下颌前伸距离（PE）的时间与组别交互效应有待进一步研究,尚不能认为组别和时间对PE影响有统计学意义。结论 LLLT适宜治疗颞下颌关节痛。

英文摘要：

Objective To evaluate effectiveness of low-level laser therapy（LLLT） on temporomandibular joint（TMJ） pain.Methods The patients with TMJ pain were randomly assigned laser group（n=21） or control group（n=21）,once a day for 6 consecutive days of treatment.TMJ pain and function were measured at baseline,just after treatment course,1 month and 2 months after the treatment.Results The changes of visual analogue scale（VAS） were appearing over time in both groups but presented statistically significant differences between groups（P0.001）.VAS of laser group decreased faster than that of control group.The same tendency occurred for painless maximum vertical opening（MVO）,left lateral excursion（LLE） and right lateral excursion（RLE）,which increased faster in laser group.There were no statistically significant differences between groups and evaluation times for protrusion excursion（PE）,but an interaction between group and evaluation times existed and should be explored further.Conclusion LLLT is an appropriate treatment for TMJ pain.