Abstract
The purpose of the study was to evaluate the longitudinal changes in electromyographic
(EMG) activity of the masseter and temporalis muscles before and after temporomandibular
joint (TMJ) total joint replacement (TJR) in ankylosis patients. A prospective longitudinal
study was designed on patients undergoing unilateral or bilateral TMJ-TJR. EMG activity
at rest and maximal voluntary contraction (MVC) was recorded for the muscles preoperatively
(T0), and at one-week (T1) and six-month (T2) follow up. The study sample was composed
of 10 (male: female 2.3:1) patients undergoing TMJ-TJR. The number of unilateral and
bilateral cases was three and seven, respectively. In both unilateral and bilateral
cases a statistically significant reduction in EMG activity of the masseter and anterior
temporalis muscles was observed at T1. At T2, EMG activity of the muscles was found
to be approaching the preoperative value. In unilateral cases, when the affected side
at T0, T1, and T2 was compared with T0 for the unaffected side, statistically significant
differences were seen for the masseter. In the case of the temporalis, similar results
were seen except at T2 for the postural rest position. The results indicate that re-attachment
of the masseter and temporalis muscles occurs progressively post TMJ-TJR.
Keywords
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Article Info
Publication History
Published online: February 01, 2022
Accepted:
January 12,
2022
Received in revised form:
January 3,
2022
Received:
November 28,
2021
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2022 The British Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.