Document Detail

Differences in masticatory function of subjects with different closing path.
MedLine Citation:
PMID:  19464981     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The purpose of this study was to clarify whether there was a difference in the masticatory function between two masticatory path patterns: a convex closing path and a concave closing path.
METHODS: For 80 healthy subjects, the masticatory function (masticatory muscular activity, mandibular movement, and masticatory performance) when chewing a gummy jelly was recorded. Out of the 160 chewing cases (80 subjects chewing on either side), 65 cases (Group I) in which the incisal point opened in a linear or concave manner toward the working side and closed in a convex manner, and 15 cases (Group II) in which the opening path was the same as that in Group I, but the closing followed a concave path, were selected. For the masticatory function, the integral values per unit time of masseter and temporal muscular activities, the gape and masticatory width, the indicators representing the stability of movement path, and the glucose extraction from chewing gummy jelly were measured and compared between the two groups.
RESULTS: The integral values of muscular activities and the amount of glucose extraction were significantly greater in Group I. The gape and masticatory width were not significantly different between the groups. The values of the indicators representing the stability of path were smaller in Group I than in Group II.
CONCLUSION: From these results, it was suggested that there was a functional difference between Group I (with a convex closing path) and Group II (with a concave closing path), and that Group I had a superior masticatory function to Group II.
Yoshinori Kobayashi; Hiroshi Shiga; Masaoki Yokoyama; Ichiro Arakawa; Kunihisa Nakajima
Publication Detail:
Type:  Journal Article     Date:  2009-05-22
Journal Detail:
Title:  Journal of prosthodontic research     Volume:  53     ISSN:  2212-4632     ISO Abbreviation:  J Prosthodont Res     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-06-03     Completed Date:  2009-09-21     Revised Date:  2012-09-11    
Medline Journal Info:
Nlm Unique ID:  101490359     Medline TA:  J Prosthodont Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  142-5     Citation Subset:  D; IM    
Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Chiyoda-ku, Tokyo, Japan.
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MeSH Terms
Masseter Muscle / physiology
Mastication / physiology*
Masticatory Muscles / physiology*
Stomatognathic System / physiology*
Temporal Muscle / physiology
Young Adult

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

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