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This prospective clinical trial aimed to evaluate the diagnostic relevance of occlusion, jaw function, and electromyographic (EMG) muscle tone in OSA patients with and without SB.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and methods<\/jats:title>\n                    <jats:p>A total of 105 OSA patients (74 males, 31 females; mean age: 56.1\u2009\u00b1\u200911.4 years) were assessed, including those with SB and without SB (NSB). Evaluations included occlusal parameters, the Jaw Functional Limitation Scale (JFLS-20), and polysomnography with EMG muscle tone analysis. Descriptive statistics, inter-group comparisons, Spearman\u2019s correlation analyses, and Receiver Operating Characteristic (ROC) curve analyses were performed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      No significant differences in occlusal parameters were observed between the SB and NSB groups. However, SB patients exhibited significantly higher JFLS-20 scores compared to NSB patients (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.002; mean global score: 20.79\u2009\u00b1\u200931.96 vs. 6.52\u2009\u00b1\u20099.70). EMG muscle tone showed significant correlations with JFLS mobility (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.015) and overall jaw function (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.046). ROC curve analysis for EMG muscle tone revealed an Area Under the Curve (AUC) of 0.911 (\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.001). An optimal cutoff value of 9.79 \u00b5V for EMG muscle tone demonstrated a sensitivity of 78.6% and specificity of 87.9%.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>EMG muscle tone may serve as a preliminary reference point for differentiating SB from NSB in OSA patients, whereas occlusion lacks diagnostic significance.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical relevance<\/jats:title>\n                    <jats:p>These findings highlight the importance of incorporating functional assessments into the diagnostic workflow for SB in OSA patients. Therapeutic strategies should prioritize functional management rather than occlusal corrections.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00784-025-06454-7","type":"journal-article","created":{"date-parts":[[2025,7,10]],"date-time":"2025-07-10T09:26:24Z","timestamp":1752139584000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Occlusion, jaw function and nocturnal muscle tone in obstructive sleep apnea with and without sleep bruxism"],"prefix":"10.1007","volume":"29","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4612-8988","authenticated-orcid":false,"given":"Janine","family":"Sambale","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ulrich","family":"Koehler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Regina","family":"Conradt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karl","family":"Kesper","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Werner","family":"Cassel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mikail","family":"Degerli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"Viniol","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heike Maria","family":"Korbmacher-Steiner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,7,9]]},"reference":[{"key":"6454_CR1","doi-asserted-by":"publisher","first-page":"687","DOI":"10.1016\/S2213-2600(19)30198-5","volume":"7","author":"AV Benjafield","year":"2019","unstructured":"Benjafield AV, Ayas NT, Eastwood PR et al (2019) Estimation of the global prevalence and burden of obstructive sleep apnoea: a literature-based analysis. 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