Abstract
The rest position of the mandible with the mouth closed is governed chiefly by the lips. The elevator and depressor muscles, together with the tongue, maintain the position. Great importance should be attached to building the vestibular part of the occlusion rims so that they support the lips fully in order to give them harmonious position and movements prior to establishing the interarch distance. The rest position with the mouth open is probably governed wholly by the balanced tonus of elevator and depressor muscles.
Published Version
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