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Magnetic Resonance Spectroscopy of the Human Masseter Muscle in Nonbruxing and Bruxing Subjects
1Department of Growth and Development, University of California, San Francisco School of Dentistry, San Francisco, California
2Department of Radiology, University of California, San Francisco School of Dentistry, San Francisco, California
3Department of Restorative Dentistry and Director, Center for Temporomandibular Disorders and Orofaciai Pain, University of California, San Francisco School of Dentistry, San Francisco, California
4Department of Restorative Dentistry, University of California, San Francisco School of Dentistry, San Francisco, California
*Corresponding Author(s): Art Miller E-mail:
The masseter muscles of six nonbruxing subjects (five men, one woman) and six bruxing subjects (four men, two women) were assessed during chewing by nuclear magnetic resonance spectroscopy (31P-NMR). The NMR spectra were collected on a GE Sigma 1.5T whole body magnet with a double-tuned 31P/1H surface coil. Two-minute trials of rest/chewing/rest were completed three times. Averaged spectra of inorganic phosphate, phosphocreatine, and three adenosine 5' triphosphate peaks were collected in each trial. Bruxing subjects had a lower concentration of total phosphate and phosphocreatine than nonbruxing (control) subjects at rest. Bruxing subjects increased their inorganic phosphate during chewing significantly less than control subjects. The pH levels during rest and during chewing were similar in both controls and bruxers. These preliminary results suggest that bruxing subjects exhibit an altered phosphate metabolism during rest and exhibit a different phosphate metabolism pattern during chewing as compared to nonbruxing subjects.
tnagnetic rcsonatice spectroscopy; masseter tnuscle; bruxing; 31P-NMR
Art Miller,Tom Marcel,Wilbert Chew,Charles McNeill,David Hatcher,Att Miller. Magnetic Resonance Spectroscopy of the Human Masseter Muscle in Nonbruxing and Bruxing Subjects. Journal of Oral & Facial Pain and Headache. 1995. 9(2);116-130.
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