Dental and Medical Problems
2016, vol. 53, nr 2, April-June, p. 175–185
Publication type: original article
Bioelectrical Activity Changes of Selected Muscles of the Face and Neck in Patients with Unilateral Cancer of the Oral Cavity Before and After Surgery
Zmiany aktywności bioelektrycznej wybranych mięśni twarzy i szyi u pacjentów z jednostronnie umiejscowionym rakiem jamy ustnej przed zabiegiem chirurgicznym i po nim
1 Postoperative Rehabilitation Office of Maxillofacial Surgery in Pomeranian Medical University in Szczecin, Szczecin, Poland
2 The Department of Prosthodontics in Pomeranian Medical University in Szczecin, Szczecin, Poland
Background. Radical excision of an oral cancer followed by post-surgical radiotherapy is a treatment of choice. Extensive excision of the initial structures in the gastrointestinal tract can impair swallowing and food intake. Early rehabilitation and compensatory mechanisms allow for the efficient return of oral function. It was assumed that this process requires increased activity of the face and neck muscles.
Objectives. Assessment of the electromyographic activity of selected muscles: sternocleidomastoid, masseter, suprahyoid and orbicularis oris (upper, lower part) during swallowing in the patients with oral cancer preand post-surgically.
Material and Methods. The study group consisted of 34 patients who were subjected to oral cancer surgery. The patients underwent surface electromyography (sEMG) examination with the use of Zebris EMG 8 bluetooth (Zebris, Isny im Allgäu, Germany) device. The examinations were performed three times: a few days before the surgery (first examination), ca. one month after the surgery (second examination), and approximately three months after the surgery (third examination).
Results. The results show a general median tension increase for the selected muscles at the end of the study. There were no statistically significant differences between the medians tensions on the surgical and non-surgical side. The exception was a change in median tensions between the suprahyoid muscles of surgical and non-surgical sides and both parts of orbicularis oris muscle. The highest tension increase was observed within the lower part of orbicularis oris muscle and the suprahyoid muscles on the non-surgical side. The smallest change was observed in masseter of the surgical side – after the increase of median tension in the second study, it returned to the initial value. Patients using compensatory mechanisms showed statistically higher median tensions.
Conclusion. About three months after the surgery, all of the patients presented increased tension in the majority of assessed muscles and accompanying improvements in the efficiency of swallowing.
electromyography, oral cancer, masticatory muscles, mouth rehabilitation
elektromiografia, rak jamy ustnej, mięśnie żucia, rehabilitacja jamy ustnej
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