Abstract
Post-stimulus EMG complexes (PSECs), consisting of a series of inhibitory and excitatory reflexes, were elicited by means of standardized taps to an upper incisor in 5 children being treated with a bionator functional appliance. These stimuli were delivered while the children were clenching in three biting conditions which were randomly alternated during the experiments, namely the maximal occlusion, the incisor edge-to-edge and the Bionator biting position. Different PSEC morphologies were observed in each of these positions, but a short latency excitatory reflex was only present in the incisor edge-to-edge biting position. It could be demonstrated that periodontal loading in the maximal occlusion and in the Bionator biting position, plays a key-role in the suppression of this reflex.

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