Zotelli VLR, et al. - This study sought to verify the effectiveness of acupuncture in treating the pain; mouth opening limitation, and energy circulating in the meridians of patients with Temporomandibular disorders (TMD) of muscular or mixed origin. In this study, volunteers with TMD reported a pattern of energy deficiency and the most prevalent imbalance patterns identified were in the Meridians coupled to the Kidney and Bladder and in the Shao Yin (Heart/Kidney) and Shao Yang (Triple Energizer/Gall Bladder) Energetic Planes. In both groups, the acupuncture points used were equally effective in reducing pain; increasing the unassisted mouth opening limitation without pain in the Treatment group, and were also effective in preserving the Yin energy in the Treatment group. There appeared an equal decrease in the Yang energy in both groups.