{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T08:34:40Z","timestamp":1780475680122,"version":"3.54.1"},"reference-count":23,"publisher":"Wiley","issue":"S1","license":[{"start":{"date-parts":[[2015,4,9]],"date-time":"2015-04-09T00:00:00Z","timestamp":1428537600000},"content-version":"vor","delay-in-days":8,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["R01 DE016417"],"award-info":[{"award-number":["R01 DE016417"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Orthod Craniofacial Res"],"published-print":{"date-parts":[[2015,4]]},"abstract":"<jats:title>Structured Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To determine differences in masticatory muscle usage between temporomandibular joint disorders diagnostic groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting and sample population<\/jats:title><jats:p>Seventy\u2010one informed and consented subjects (27 men; 44 women) participated at the University at Buffalo.<\/jats:p><\/jats:sec><jats:sec><jats:title>Material and methods<\/jats:title><jats:p>Research diagnostic criteria and imaging data were used to categorize subjects according to the presence\/absence (+\/\u2212) of <jats:styled-content style=\"fixed-case\">TMJ<\/jats:styled-content> disc placement (<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>) and chronic pain (P) (+<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>+P, n\u00a0=\u00a018; +<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>\u2212P, n\u00a0=\u00a014; \u2212<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>\u2212P, n\u00a0=\u00a039). Electromyographic (<jats:styled-content style=\"fixed-case\">EMG<\/jats:styled-content>)\/bite\u2010force calibrations determined subject\u2010specific masseter and temporalis muscle activities per 20\u00a0N bite\u2010force (<jats:italic>T<\/jats:italic><jats:sub>20N<\/jats:sub>, \u03bcV). Over 3\u00a0days and nights, subjects collected <jats:styled-content style=\"fixed-case\">EMG<\/jats:styled-content> recordings. Duty factors (<jats:styled-content style=\"fixed-case\">DF<\/jats:styled-content>s, % of recording time) were determined based on threshold intervals (5\u20139, 10\u201324, 25\u201349, 50\u201379, \u226580% <jats:italic>T<\/jats:italic><jats:sub>20N<\/jats:sub>). <jats:sc>anova<\/jats:sc> and Tukey\u2013Kramer <jats:italic>post hoc<\/jats:italic> tests identified 1) diagnostic group differences in <jats:italic>T<\/jats:italic><jats:sub>20N<\/jats:sub> and 2) the effects of diagnostic group, gender, time and interval on muscle <jats:styled-content style=\"fixed-case\">DF<\/jats:styled-content>s.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Mean (\u00b1\u00a0SE) temporalis <jats:italic>T<\/jats:italic><jats:sub>20N<\/jats:sub> in +<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>+P subjects was significantly higher (71.4\u00a0\u00b1\u00a08.8\u00a0\u03bcV) than masseter <jats:italic>T<\/jats:italic><jats:sub>20N<\/jats:sub> in these subjects (19.6\u00a0\u00b1\u00a08.8\u00a0\u03bcV; <jats:italic>p<\/jats:italic>\u00a0=\u00a00.001) and in \u2212<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>\u2212P subjects (25.3\u00a0\u00b1\u00a06.0\u00a0\u03bcV, <jats:italic>p<\/jats:italic>\u00a0=\u00a00.0007). Masseter <jats:styled-content style=\"fixed-case\">DF<\/jats:styled-content>s at 5\u20139% <jats:italic>T<\/jats:italic><jats:sub>20N<\/jats:sub> were significantly higher in +<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>\u2212P women (3.48%) than +<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>\u2212P men (0.85%) and women and men in both other diagnostic groups (all <jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.03), and in +<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>+P women (2.00%) compared to \u2212<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>\u2212P men (0.83%; <jats:italic>p<\/jats:italic>\u00a0=\u00a00.029). Night\u2010time <jats:styled-content style=\"fixed-case\">DF<\/jats:styled-content>s at 5\u20139% <jats:italic>T<\/jats:italic><jats:sub>20N<\/jats:sub> in +<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>\u2212P women (1.97%) were significantly higher than in \u2212<jats:styled-content style=\"fixed-case\">DD<\/jats:styled-content>\u2212P men (0.47%) and women (0.24%; all <jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.01).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Between\u2010group differences were found in masticatory muscle activities in both laboratory and natural environmental settings.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ocr.12085","type":"journal-article","created":{"date-parts":[[2015,4,11]],"date-time":"2015-04-11T00:45:13Z","timestamp":1428713113000},"page":"146-155","source":"Crossref","is-referenced-by-count":37,"title":["A pilot study of ambulatory masticatory muscle activities in temporomandibular joint disorders diagnostic groups"],"prefix":"10.1111","volume":"18","author":[{"given":"L. R.","family":"Iwasaki","sequence":"first","affiliation":[{"name":"Departments of Orthodontics &amp; Dentofacial Orthopedics and Oral &amp; Craniofacial Sciences School of Dentistry University of Missouri\u2013Kansas City Kansas City MO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y. M.","family":"Gonzalez","sequence":"additional","affiliation":[{"name":"Department of Oral Diagnostic Sciences School of Dental Medicine University at Buffalo Buffalo NY USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Liu","sequence":"additional","affiliation":[{"name":"Departments of Orthodontics &amp; Dentofacial Orthopedics and Oral &amp; Craniofacial Sciences School of Dentistry University of Missouri\u2013Kansas City Kansas City MO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D. B.","family":"Marx","sequence":"additional","affiliation":[{"name":"Department of Statistics University of Nebraska\u2010Lincoln Lincoln NE USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L. M.","family":"Gallo","sequence":"additional","affiliation":[{"name":"Clinic of Masticatory Disorders Removable Prosthodontics Geriatric and Special Care Dentistry Center of Dental Medicine University of Zurich Zurich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J. C.","family":"Nickel","sequence":"additional","affiliation":[{"name":"Departments of Orthodontics &amp; Dentofacial Orthopedics and Oral &amp; Craniofacial Sciences School of Dentistry University of Missouri\u2013Kansas City Kansas City MO USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2015,4,9]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jcms.2011.04.006"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tripleo.2009.02.023"},{"key":"e_1_2_8_4_1","first-page":"7","article-title":"The research diagnostic criteria for temporomandibular disorders. I: overview and methodology for assessment of validity","volume":"24","author":"Schiffman EL","year":"2010","journal-title":"J Orofac Pain"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0528.1975.tb00284.x"},{"key":"e_1_2_8_6_1","first-page":"189","article-title":"Prevalence of functional disturbances and diseases of the stomatognathic system in 15\u201318\u00a0year olds","volume":"5","author":"Nilner M","year":"1981","journal-title":"Swed Dent J"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-3913(88)90019-4"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.14219\/jada.archive.1979.0008"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/art.1780400420"},{"key":"e_1_2_8_10_1","first-page":"427","article-title":"Estimates of the prevalence of selected arthritic and musculoskeletal diseases in the United States","volume":"16","author":"Lawrence RC","year":"1989","journal-title":"J Rheumatol"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.rdc.2008.05.011"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1177\/1947603513495889"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.4081\/or.2009.e29"},{"key":"e_1_2_8_14_1","first-page":"427","volume-title":"Temporomandibular Disorders and Orofacial Pain \u2013 Separating Controversy from Consensus","author":"Nickel JC","year":"2009"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/joor.12112"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.14219\/jada.archive.2012.0068"},{"key":"e_1_2_8_17_1","first-page":"301","article-title":"Research diagnostic criteria for temporomandibular disorders: review, criteria, examinations and specifications, critique","volume":"6","author":"Dworkin SF","year":"1992","journal-title":"J Craniomandib Disord"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00221-004-2174-9"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0722.2007.00424.x"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0722.2011.00823.x"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1834-7819.2008.00050.x"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1177\/0022034512445909"},{"key":"e_1_2_8_23_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2842.2006.01660.x"},{"key":"e_1_2_8_24_1","doi-asserted-by":"publisher","DOI":"10.1111\/ocr.12074"}],"container-title":["Orthodontics &amp; Craniofacial Research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1111%2Focr.12085","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/ocr.12085","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,9,13]],"date-time":"2023-09-13T07:47:11Z","timestamp":1694591231000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/ocr.12085"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,4]]},"references-count":23,"journal-issue":{"issue":"S1","published-print":{"date-parts":[[2015,4]]}},"alternative-id":["10.1111\/ocr.12085"],"URL":"https:\/\/doi.org\/10.1111\/ocr.12085","archive":["Portico"],"relation":{},"ISSN":["1601-6335","1601-6343"],"issn-type":[{"value":"1601-6335","type":"print"},{"value":"1601-6343","type":"electronic"}],"subject":[],"published":{"date-parts":[[2015,4]]}}}