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Frequency Spectrum Analysis of the Joint’s Sound form Temporomandibular Disorder

Li Jian, Wu fengming, Stomatological hospital, Nanjing Medical University, Nanjing 210029. Huang Xiaoping, Preclinical Medicine College of Nanjing Medical University, Nanjing, 210029.  
Aim The purpose of this study is to explore the clinical significance of frequency spectrum analysis in joint’s sound with temporomandibular disorder(TMD). Methods The computer is connected with polygraph system, bilateral temporomandibular joint’s sound are recorded synchronously, and 32 cases of the TMD Joint’s are prossed with the method of frequency spectrum analysis. Results On the energy there are significant differences both opened and closed joint’s sound of Ma’s Ⅰ,Ⅱ and Ⅲ class of TMD. ( P 0.001);and so are the energy rate ( P 0.001).Conclusion The method of the frequency spectrum analysis may provide a more sensitive and noninvasive tool for auxiliary diagnosis of TMD.
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