Appliance which follows the safety pin principle and represents exercise for the lips
The spring, which also serves as a grip, is bent once around the loop forming pliers. The following zigzag bent is used for activation if the tension decreases. The retention works simultaneously as reinforcement for the acrylic shield.
The wire end and the retention are underlaid with a wax plate and framed with a wax stripe.
The acrylic shield is finished concave to the labial surface, corresponding with the shape of the lip.
