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Infield masticatory muscle activity in subjects with pain‐related temporomandibular disorders diagnoses
Author(s) -
Khawaja S. N.,
McCall W.,
Dunford R.,
Nickel J. C.,
Iwasaki L. R.,
Crow H. C.,
Gonzalez Y.
Publication year - 2015
Publication title -
orthodontics and craniofacial research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 55
eISSN - 1601-6343
pISSN - 1601-6335
DOI - 10.1111/ocr.12077
Subject(s) - masticatory force , research diagnostic criteria , medicine , sleep bruxism , masseter muscle , temporomandibular joint dysfunction syndrome , orofacial pain , physical therapy , association (psychology) , medical diagnosis , physical medicine and rehabilitation , orthodontics , electromyography , psychology , temporomandibular joint , dentistry , chronic pain , pathology , psychotherapist
Structured Abstract Objectives Pain‐related temporomandibular disorders ( TMD s) are the most prevalent conditions among TMD s. There is contrasting evidence available for association of pain‐related TMD and masticatory muscle activity ( MMA ). The present investigation assesses the associations between MMA levels of masseter and temporalis muscles during awake and sleep among pain‐related TMD diagnostic groups. Setting and Sample Population The department of Oral Diagnostic Sciences, University at Buffalo. Twenty females and six males participated in this study. Material and Methods Using the diagnostic criteria for temporomandibular disorders ( DC ‐ TMD s), participants were diagnostically categorized. Subjects used a custom monitoring system, which recorded infield muscle activities. A factorial model tested for association between independent variable (muscle, time period, MMA level, and diagnostic group) effects and the logarithm of MMA . Greenhouse–Geisser test was used to determine any statistically significant associations ( p ≤ 0.003). Results No statistically significant association was found between four‐way, three‐way, and two‐way analyses. However, among the main effects, range of magnitudes was the only variable to be statistically significant. Although the data suggest a trend of increased masseter MMA in the pain‐related TMD diagnoses group both during awake and sleep time periods, such observation is not maintained for the temporalis muscle. In addition, temporalis MMA was found to be higher in the pain‐related TMD diagnoses group only at extreme activity levels (<25 and ≥80% ranges). Conclusion This data support the association between masticatory muscle hyperactivity and painful TMD conditions.