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Article: Relationship between the unilateral TMJ osteoarthritis/osteoarthrosis, mandibular asymmetry and the EMG activity of the masticatory muscles: A retrospective study

TitleRelationship between the unilateral TMJ osteoarthritis/osteoarthrosis, mandibular asymmetry and the EMG activity of the masticatory muscles: A retrospective study
Authors
KeywordsElectromyogram
Mandibular asymmetry
Osteoarthritis
Osteoarthrosis
Temporomandibular joint
Issue Date2010
PublisherBlackwell Publishing Ltd.
Citation
Journal Of Oral Rehabilitation, 2010, v. 37 n. 2, p. 85-92 How to Cite?
AbstractThe purpose of this retrospective study was to investigate the relationship between the unilateral temporomandibular joint (TMJ) osteoarthritis/ osteoarthrosis (OA), mandibular asymmetry and electromyographic (EMG) activity of the masticatory muscles. Twenty-two Japanese women (aged 23·2 ± 5·4 years) and 10 Japanese men (aged 22·4 ± 2·8 years) exhibiting unilateral TMJ OA were included in this study. Two angular and seven linear measurements were obtained for the analysis of the skeletal hard tissues. The cephalometric measurement values (CV) were normalized using the CV ratio for the evaluation of the degree of mandibular asymmetry. The EMG was recorded during maximal voluntary clenching efforts for 10 s in the intercuspal position. The average values of integral EMG (iEMG) of three trials were normalized using the iEMG ratio for the evaluation of the functional balance of the masticatory muscles. The mandibular midline was shifted to the TMJ OA side with a median value of 9·85 mm. The CV ratio of the ramus height of the TMJ OA side was significantly smaller than that of the non-OA side. For the masseter muscle, the iEMG ratio of the TMJ OA side was significantly larger than that of the non-OA side (P < 0·05). These results suggest that unilateral TMJ OA is related to the dentofacial morphology, thus resulting in a mandibular midline shift to the affected side and it is associated with a masticatory muscle imbalance. © 2009 Blackwell Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/134959
ISSN
2015 Impact Factor: 1.926
2015 SCImago Journal Rankings: 0.757
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMatsumoto, Ren_HK
dc.contributor.authorIoi, Hen_HK
dc.contributor.authorGoto, TKen_HK
dc.contributor.authorHara, Aen_HK
dc.contributor.authorNakata, Sen_HK
dc.contributor.authorNakasima, Aen_HK
dc.contributor.authorCounts, ALen_HK
dc.date.accessioned2011-07-27T01:25:05Z-
dc.date.available2011-07-27T01:25:05Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of Oral Rehabilitation, 2010, v. 37 n. 2, p. 85-92en_HK
dc.identifier.issn0305-182Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/134959-
dc.description.abstractThe purpose of this retrospective study was to investigate the relationship between the unilateral temporomandibular joint (TMJ) osteoarthritis/ osteoarthrosis (OA), mandibular asymmetry and electromyographic (EMG) activity of the masticatory muscles. Twenty-two Japanese women (aged 23·2 ± 5·4 years) and 10 Japanese men (aged 22·4 ± 2·8 years) exhibiting unilateral TMJ OA were included in this study. Two angular and seven linear measurements were obtained for the analysis of the skeletal hard tissues. The cephalometric measurement values (CV) were normalized using the CV ratio for the evaluation of the degree of mandibular asymmetry. The EMG was recorded during maximal voluntary clenching efforts for 10 s in the intercuspal position. The average values of integral EMG (iEMG) of three trials were normalized using the iEMG ratio for the evaluation of the functional balance of the masticatory muscles. The mandibular midline was shifted to the TMJ OA side with a median value of 9·85 mm. The CV ratio of the ramus height of the TMJ OA side was significantly smaller than that of the non-OA side. For the masseter muscle, the iEMG ratio of the TMJ OA side was significantly larger than that of the non-OA side (P < 0·05). These results suggest that unilateral TMJ OA is related to the dentofacial morphology, thus resulting in a mandibular midline shift to the affected side and it is associated with a masticatory muscle imbalance. © 2009 Blackwell Publishing Ltd.en_HK
dc.languageengen_US
dc.publisherBlackwell Publishing Ltd.-
dc.relation.ispartofJournal of Oral Rehabilitationen_HK
dc.rightsThe definitive version is available at www.blackwell-synergy.com-
dc.subjectElectromyogramen_HK
dc.subjectMandibular asymmetryen_HK
dc.subjectOsteoarthritisen_HK
dc.subjectOsteoarthrosisen_HK
dc.subjectTemporomandibular jointen_HK
dc.subject.meshElectromyography-
dc.subject.meshFacial Asymmetry - physiopathology-
dc.subject.meshMandibular Diseases - physiopathology-
dc.subject.meshMasseter Muscle - physiopathology-
dc.subject.meshOsteoarthritis - physiopathology-
dc.titleRelationship between the unilateral TMJ osteoarthritis/osteoarthrosis, mandibular asymmetry and the EMG activity of the masticatory muscles: A retrospective studyen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0305-182X&volume=37&issue=2&spage=85&epage=92&date=2010&atitle=Relationship+between+the+unilateral+TMJ+osteoarthritis/osteoarthrosis,+mandibular+asymmetry+and+the+EMG+activity+of+the+masticatory+muscles:+a+retrospective+study-
dc.identifier.emailGoto, TK:gototk@hku.hken_HK
dc.identifier.authorityGoto, TK=rp01434en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2842.2009.02026.xen_HK
dc.identifier.pmid20002534-
dc.identifier.scopuseid_2-s2.0-74349122628en_HK
dc.identifier.hkuros186114en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-74349122628&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume37en_HK
dc.identifier.issue2en_HK
dc.identifier.spage85en_HK
dc.identifier.epage92en_HK
dc.identifier.isiWOS:000273604500002-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridMatsumoto, R=15049507400en_HK
dc.identifier.scopusauthoridIoi, H=6602161319en_HK
dc.identifier.scopusauthoridGoto, TK=7403938313en_HK
dc.identifier.scopusauthoridHara, A=35564956100en_HK
dc.identifier.scopusauthoridNakata, S=7202359437en_HK
dc.identifier.scopusauthoridNakasima, A=7003679020en_HK
dc.identifier.scopusauthoridCounts, AL=6603829257en_HK
dc.identifier.citeulike6578628-

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