Article: Unilateral masseter muscle hypertrophy: morphofunctional analysis of the relapse after treatment with botulinum toxin.(Case study)

ABSTRACT: This is a case of unilateral masseter muscle hypertrophy (MMH) treated with botulinum toxin (NHAI--normalised hemi-facial asymmetry index improvement from 5.48 to 3.04). After 19 months, the treatment was repeated because of hypertrophy relapse (NHAI increase up to 6.82). The volume variations in the masseter area were monitored during 25 months using a laser scanner to compute facial volume. In order to relate the cause of hypertrophy and relapse to the presence of parafunctional activities, a nocturnal electromyography (EMG) study was conducted with positive results (nocturnal parafunctions of patients 4074.99 [micro]V to be compared with a control group value ...

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