| Mandibular rest position and electrical activity of the masticatory muscles. | |
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MedLine Citation:
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PMID: 9237146 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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STATEMENT OF PROBLEM: The determination of a correct vertical dimension of occlusion is a critical procedure in clinical dentistry. PURPOSE: The objectives of this study were to analyze the relation between mandibular rest position and electrical activity of masticatory muscles and to compare clinical and electromyographic rest position in subjects with different vertical facial morphologic features. MATERIAL AND METHODS: Clinical rest position and electromyographic rest position were investigated in 40 subjects. Electromyographic rest position ranged from 0.4 to 12.7 mm (average 7.7 +/- 2.7 mm). Clinical rest position ranged from 0.1 to 4.4 mm (average 1.4 +/- 1.1 mm). The average difference between electromyographic rest position and clinical rest position was 6.3 +/- 2.5 mm (range 0.3 to 10.3 mm). Sixteen subjects were selected according to the Frankfort mandibular plane angle and separated in two groups having a mandibular plane angle > or = 28 degrees. RESULTS: Rest position was significantly greater (p < 0.05) in the low-angle group (2 +/- 1.3 mm) than in the high angle group (0.8 +/- 0.8 mm). Electromyographic rest position did not differ between subjects with different facial morphologic features (8.1 +/- 1.7 mm low-angle group; 7.6 +/- 4.1 mm high angle group). By varying the vertical dimension millimeter by millimeter, masseter and anterior temporal electromyographic activity demonstrated a considerable decrease over an interocclusal distance of 3 to 4 mm. Further mandibular opening up to 18 mm corresponded to small changes in postural activity. CONCLUSION: This study suggests that a jaw posture with a few millimeters of interocclusal distance involves a great reduction of masticatory muscle activity. |
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Authors:
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A Michelotti; M Farella; S Vollaro; R Martina |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of prosthetic dentistry Volume: 78 ISSN: 0022-3913 ISO Abbreviation: J Prosthet Dent Publication Date: 1997 Jul |
Date Detail:
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Created Date: 1997-09-18 Completed Date: 1997-09-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0376364 Medline TA: J Prosthet Dent Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 48-53 Citation Subset: D; IM |
Affiliation:
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Department of Orthodontics, University of Naples Federico II, Italy. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Cephalometry Dental Occlusion, Centric Electromyography* Face / anatomy & histology Female Humans Jaw Relation Record Male Mandible / anatomy & histology*, physiology Masseter Muscle / physiology Masticatory Muscles / physiology* Movement Posture Regression Analysis Temporal Muscle / physiology Vertical Dimension* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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