Objectives: The aim of this study was to examine the effect of TMJ Balancing Appliance (TBA) on healthy humans by using power spectral analysis of Electroencephalogram (EEG). Methods: 50 healthy volunteers participated in this study. A thirty-two channel EEG device was used for this study on 50 subjects (28 males, 22 females; mean age=25.3 years old). Results: 19 channel was measured and analysed. The relative power values in α, β, γ, Senorimotor rhythm (SMR), mid-β, high-β band and concentration index ((SMR wave＋Mid-β wave)/θ) increased insignificantly. Relaxation index(α/High-β wave) increased significantly (p＜0.05) comparing to the before the TBA application. After the TBA application, the relative power values in α, β, γ, SMR (Senorimotor rhythm), mid-β, high-β band and concentration index((SMR wave＋Mid-β wave)/θ) increased insignificantly. Relaxation index (α/High-β wave) increased significantly (p ＜0.01) comparing to the before the TBA application. Conclusions: These results suggest that TBA application causes significant changes on relaxation index. Application of TBA shall regulate the function of the cerebral cortex increase parasympathetic nervous activity.
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