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Occlusal evaluation by masticatory EMG in myo-oral facial pain patients
MULTIPLE
5.
6.
AXIAL
GROOVES
micromeasurement of vented and nonvented cast crown marginal adaptation. Dent Clin North Am 15:663, 1971. Kaufman, E. G., Colin, L., Schlagel, E., and Coelho, D. H.: Factors influencing the retention of cemented gold castings: The cementing medium. J PROSTHET DENT 16:731, 1966. Hoard, R. J., Caputo, A. A., Contino, R. M., and Koenig, M. E.: Intracoronal pressure during crown cementation. J PROSTHE.~ DENT 40:520, 1978.
IADR PROSTHODONTIC Occlusal evaluation
by masticatory EMG in myo-oral
Chair-side electromyography (EMG) of masticatoty musculature to aid in occlusal evaluation in clinical situations has been used in this laboratory for several years and has been reported at the last three annual AADR-IADR meetings. Amplitude and frequency values from masticatory muscle potentials recorded with bipolar surface electrodes have been proven statistically reliable from repeated recordings on normal individuals. This study used 19 patients (16 women, 3 men) with myo-oral facial pain problems (pain, clicking, and restricted interincisal openings). The E M G Integrator-Averager was used for muscle evaluation ofjaw positions. Recording was made from surface electrodes over masseter and anterior tempo-
Reprinted from the Journal of Dental Research [59 (Special Issue A), 1980 (Abst No. 198)] with permission of the author and the editor.
OF PROSTHETIC
UNIVERSITY OF SOUTHERN CALIFORNIA SCHOOL OF DENTISTRY Los ANGELES, CA 90007
ABSTRACT
L. Staling, W. Ramsey, G. Cylus, E. Grace, L. Weiner, University of Maryland, Dental School, Baltimore, Md.
THE JOURNAL
Reprint requeststo: DR. ANTHONY H. L. TJAN
DENTISTRY
facial pain patients
J. Buxbaum, and M. Graham ralis muscles with simultaneous bilateral muscle potentials integrated and averaged over 2-second periods of frequency (Hz) and amplitude (uV). Each run included five mandibular positions: rest, contact occlusion, chew right and left, and clench, with five readings in each position for a total of 50 readings/ patient/run. Interincisal opening values ranged from 29 to 50 mm. A comparative plotting of amplitude with frequency, determined from external calibration of the E M G Integrator-Averager, demonstrated a consistent linear relation .at variable output levels. Similar plots on each patient showed the linear relation of Hz and UV only if severe hypertonic muscle activity was absent from the patient’s recording. Linearity was disrupted by severe muscle activity imbalance in occlusal position. This demonstrated characteristic muscle hypertonicity coincident with changing mandibular position may have prognostic value. Grant No. AFDH 3N ASAA.
403
5.
6.
AXIAL
GROOVES
micromeasurement of vented and nonvented cast crown marginal adaptation. Dent Clin North Am 15:663, 1971. Kaufman, E. G., Colin, L., Schlagel, E., and Coelho, D. H.: Factors influencing the retention of cemented gold castings: The cementing medium. J PROSTHET DENT 16:731, 1966. Hoard, R. J., Caputo, A. A., Contino, R. M., and Koenig, M. E.: Intracoronal pressure during crown cementation. J PROSTHE.~ DENT 40:520, 1978.
IADR PROSTHODONTIC Occlusal evaluation
by masticatory EMG in myo-oral
Chair-side electromyography (EMG) of masticatoty musculature to aid in occlusal evaluation in clinical situations has been used in this laboratory for several years and has been reported at the last three annual AADR-IADR meetings. Amplitude and frequency values from masticatory muscle potentials recorded with bipolar surface electrodes have been proven statistically reliable from repeated recordings on normal individuals. This study used 19 patients (16 women, 3 men) with myo-oral facial pain problems (pain, clicking, and restricted interincisal openings). The E M G Integrator-Averager was used for muscle evaluation ofjaw positions. Recording was made from surface electrodes over masseter and anterior tempo-
Reprinted from the Journal of Dental Research [59 (Special Issue A), 1980 (Abst No. 198)] with permission of the author and the editor.
OF PROSTHETIC
UNIVERSITY OF SOUTHERN CALIFORNIA SCHOOL OF DENTISTRY Los ANGELES, CA 90007
ABSTRACT
L. Staling, W. Ramsey, G. Cylus, E. Grace, L. Weiner, University of Maryland, Dental School, Baltimore, Md.
THE JOURNAL
Reprint requeststo: DR. ANTHONY H. L. TJAN
DENTISTRY
facial pain patients
J. Buxbaum, and M. Graham ralis muscles with simultaneous bilateral muscle potentials integrated and averaged over 2-second periods of frequency (Hz) and amplitude (uV). Each run included five mandibular positions: rest, contact occlusion, chew right and left, and clench, with five readings in each position for a total of 50 readings/ patient/run. Interincisal opening values ranged from 29 to 50 mm. A comparative plotting of amplitude with frequency, determined from external calibration of the E M G Integrator-Averager, demonstrated a consistent linear relation .at variable output levels. Similar plots on each patient showed the linear relation of Hz and UV only if severe hypertonic muscle activity was absent from the patient’s recording. Linearity was disrupted by severe muscle activity imbalance in occlusal position. This demonstrated characteristic muscle hypertonicity coincident with changing mandibular position may have prognostic value. Grant No. AFDH 3N ASAA.
403