Document Detail

Analysis of muscle hardness in patients with masticatory myofascial pain.
MedLine Citation:
PMID:  16413887     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The aim of the present study was to access any changes in the muscle hardness of the masseter muscle between normal subjects and patients with myofascial pain during brief sustained isometric contractions at various bite force levels, and to compare muscle hardness, especially in terms of the recovery phase, after a clenching task. MATERIALS AND METHODS: Ten patients with masticatory myofascial pain and 10 age- and weight-matched normal healthy controls participated in this study. First, the hardness of the right masseter muscle was measured at the bite force of 0, 3, 6, and 9 kgf with a hand-held hardness meter. Then, the subjects were requested to exert a 9 kgf-clenching task for 30 seconds. The muscle hardness was again measured at 5, 30, and 120 seconds after the task, and the data obtained were compared with the muscle hardness before the clenching task. RESULTS: The results showed that there was no significant difference between the patients and the normal controls, while the muscle hardness increased with contraction in all subjects. The present findings also showed that the patients had a delayed return to baseline after the clenching task compared with the normal subjects, although an immediate increase after the clenching task was seen in all subjects. CONCLUSION: The results indicated that patients with masticatory myofascial pain have different muscle properties in the recovery phase after contraction, probably because of a slower intramuscular reperfusion.
Koji Kashima; Kaori Igawa; Sho Maeda; Sumio Sakoda
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons     Volume:  64     ISSN:  0278-2391     ISO Abbreviation:  J. Oral Maxillofac. Surg.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-01-17     Completed Date:  2006-02-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8206428     Medline TA:  J Oral Maxillofac Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  175-9     Citation Subset:  AIM; D; IM    
Professor, Department of Oral and Maxillofacial Surgery, Miyazaki Medical College, Miyazaki, Japan.
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MeSH Terms
Analysis of Variance
Bite Force
Case-Control Studies
Hardness Tests / methods
Masseter Muscle / physiopathology*
Muscle Contraction / physiology
Muscle Tonus*
Temporomandibular Joint Dysfunction Syndrome / physiopathology*

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