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Πέμπτη 28 Ιανουαρίου 2021

Is jaw muscle activity impaired in adults with persistent temporomandibular disorders? A systematic review and meta‐analysis

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Abstract

Understanding jaw muscle activity changes in temporomandibular disorders (TMD) is crucial to guide clinical management. The nature of these changes is currently unclear. Explore changes in jaw muscle activity in TMD. Electronic databases (PubMed, EMBASE, CINAHL, Scopus, Web of Science, Cochrane) and bibliographies were searched from inception to 9 July 2020 for eligible studies, including grey literature. Case‐control and interventional studies reporting time‐domain and frequency‐domain electromyographic measures of jaw muscle activity in TMD and control groups were included. SIGN checklist for case‐control studies was used to evaluate risk of bias. Results were pooled for meta‐analysis using random‐effects model. Confidence in cumulative evidence was established using American Academy of Neurology guidelines. Forty‐five studies were included. Most were rated moderate risk of bias. Activity of four muscles (masseter, temporalis, lateral pterygoid, suprahyoids) was as sessed across six domains (resting, clenching, chewing, swallowing, concentrating, resisted mandibular movements), with partial meta‐analysis scope. Masseter and temporalis activity were significantly higher at rest (P = .05, P < .0001), but lower during brief maximal clenching (P = .005, P = .04) in TMD vs controls. Insufficient data precluded meta‐analysis of remaining outcomes and subgroup analysis. Confidence in cumulative evidence ranged from moderate to very low. Changes in jaw muscle activity exist in TMD, which are both task‐specific and muscle‐specific. It remains unclear whether jaw muscle activity changes vary between TMD subgroups. Muscle function should be considered in clinical management of TMD. Insufficient subgroup data highlight future direction for research.

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Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,00306932607174,alsfakia@gmail.com,

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