Document Detail

Reproducibility of mandibular motion and muscle activity levels using a commercial computer recording system.
MedLine Citation:
PMID:  1501189     Owner:  NLM     Status:  MEDLINE    
A commercial computer recording system (BioPak) was tested for its accuracy and reproducibility in recording mandibular motion and muscle activity levels (EMG). Accuracy of measurements of mandibular motion was tested using sliding calipers. Accuracy of muscle activity levels was checked with a sine-wave calibration signal of known amplitude and frequency. Reproducibility of motion and of EMG was made using five control subjects each tested on 3 separate days. Computer measurements of motion were found to require correction for nonlinearity at openings beyond 45 mm. Most maximum voluntary excursions were found to be more reproducible than motions during mastication. However, lateral deviation during opening was strongly affected by magnet orientation and varied greatly between trials. Electromyographic recordings were distorted by improper treatment of high-frequency components of the signal and also varied greatly between trials. This study suggests that the BioPak system may indicate changes in some measures of mandibular motion and EMG levels in patients for whom no changes have occurred.
G S Throckmorton; T J Teenier; E Ellis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of prosthetic dentistry     Volume:  68     ISSN:  0022-3913     ISO Abbreviation:  J Prosthet Dent     Publication Date:  1992 Aug 
Date Detail:
Created Date:  1992-09-17     Completed Date:  1992-09-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  348-54     Citation Subset:  D; IM    
University of Texas Southwestern Medical Center, Dallas.
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MeSH Terms
Bite Force
Dental Occlusion, Centric
Electromyography* / instrumentation,  methods
Isometric Contraction
Jaw Relation Record
Mandible / physiology*
Masticatory Muscles / physiology*
Reproducibility of Results
Signal Processing, Computer-Assisted* / instrumentation

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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