• Liliana Szyszka-Sommerfeld, Teresa Matthews-Brzozowska, Beata Kawala, Marcin Mikulewicz, Monika Machoy, Włodzimierz Więckiewicz, and Krzysztof Woźniak.
• Department of Orthodontics, Pomeranian Medical University of Szczecin, Al. Powstańców Wlkp. 72, Szczecin 70111, Poland.
• Pain Res Manag. 2018 Jan 1; 2018: 4182843.

AimThe aim of this study was to assess the electrical activity of temporalis and masseter muscles in children with cleft lip and palate (CLP) and pain-related temporomandibular disorders (TMD-P).MethodsThe sample consisted of 31 CLP patients with a TMD-P (mean age 9.5 ± 1.8 years) and 32 CLP subjects with no TMD (mean age 9.2 ± 1.7 years). The children were assessed for the presence of temporomandibular disorders (TMD) using Axis I of the Research Diagnostic Criteria for TMD (RDC/TMD). Electromyographical (EMG) recordings were performed using a DAB-Bluetooth Instrument (Zebris Medical GmbH, Germany) in the mandibular rest position and during maximum voluntary contraction (MVC).ResultsThe rest activity of the temporalis and masseter muscles was significantly higher in TMD-P group compared with non-TMD children. A significant decrease in temporalis muscle activity during MVC was observed in TMD-P patients. There was a significant increase in the Asymmetry Index for temporalis and masseter muscle rest activity in the TMD-P group.ConclusionCleft children diagnosed with TMD-P have altered masticatory muscle activity, and this can affect their muscle function.

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