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BioMed Research International
Volume 2015, Article ID 512792, 7 pages
Research Article

Jaw Dysfunction Is Associated with Neck Disability and Muscle Tenderness in Subjects with and without Chronic Temporomandibular Disorders

1Alberta Health Services, University of Alberta Hospital, Edmonton, AB, Canada T6G 2B7
2Department of Physical Therapy, Florida International University, Miami, FL 33199, USA
3Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, AB, Canada T6G 2G4
4Department of Physical Therapy and Postgraduate Program in Rehabilitation Sciences, Nove de Julho University, 01504-001 São Paulo, SP, Brazil

Received 22 August 2014; Revised 26 October 2014; Accepted 27 October 2014

Academic Editor: Mieszko Wieckiewicz

Copyright © 2015 A. Silveira et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. Tender points in the neck are common in patients with temporomandibular disorders (TMD). However, the correlation among neck disability, jaw dysfunction, and muscle tenderness in subjects with TMD still needs further investigation. This study investigated the correlation among neck disability, jaw dysfunction, and muscle tenderness in subjects with and without chronic TMD. Participants. Forty females between 19 and 49 years old were included in this study. There were 20 healthy controls and 20 subjects who had chronic TMD and neck disability. Methods. Subjects completed the neck disability index and the limitations of daily functions in TMD questionnaires. Tenderness of the masticatory and cervical muscles was measured using an algometer. Results. The correlation between jaw disability and neck disability was significantly high (, ). The correlation between level of muscle tenderness in the masticatory and cervical muscles with jaw dysfunction and neck disability showed fair to moderate correlations (). Conclusion. High levels of muscle tenderness in upper trapezius and temporalis muscles correlated with high levels of jaw and neck dysfunction. Moreover, high levels of neck disability correlated with high levels of jaw disability. These findings emphasize the importance of considering the neck and its structures when evaluating and treating patients with TMD.