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^31P-NMR Spectroscopy Evaluation of the Human Masseter Muscle in Normal and Bruxing Subjects
Negoro, Takefumi,Marcel, Tom,McNeill, Charles,Hatcher, David,Chew, Wilbert,Hiraba, Katsunari,Goto, Shigemi,Miller, Arthur J. Korean Academy of Oral Biology and the UCLA Dental 2001 International Journal of Oral Biology Vol.26 No.2
^31P magnetic resonance spectroscopy provides a noninvasive tool to assess muscle metabolism during rest, exercise, and recovery. Each averaged spectrum demonstrated seven peaks: phosphomonoester(PME), inorganic phosphate(Pi), phosphodiester(PDE), creatine phosphate(PCr), and γ-,α-,β- phosphorus nuclei of ATP. Abnormal PME or PDE levels can characterize muscle disease and function. It was investigated as to whether these two substances, and the relationship between Pi/PCr and pH, were at different levels in young adult bruxing subjects versus normal young adults. During contraction of the masseter muscle involved with chewing or clenching, the PCr peak would diminish while the Pi peak would increase. Ecpressing changes in Pi, PCr, PME and PDE to the total phosphate(total P) that includes these four spectra and the three ATP peaks, indicates a percentage change for each of the separate components. The Pi/total P ratio increased, and the PCr/total P ratio decreased significantly during chewing and clenching in both groups. Changes in PME and PDE were similar for the control and bruxing subjects. Pi/PCr increased as pH decreased in both the control and bruxing subjects. In the control subjects, the Pi/PCr ratio during. The correlation coefficient of a linear regression analysis between Pi/PCr and pH was significantly lower in bruxing subjects (r=-0.643) than that of control subjects (r=-0.864). These findings suggests the concept that metabolism of masseter muscle in bruxing subjects may not perform similarly to normal subjects but similar changes in PME and PDE to control subjects. Also it is considered the possibility that the rapid decline in pH in bruxing subjects may have been associated with the development of muscle fatigue.