Labial bow 0.8 mm spring hard, Coffin spring 1.2 mm spring hard, tongue crib 1.0 mm spring hard, mandibular connection bow 1.0 mm spring hard
Function:
Intrusion of the posterior teeth, extrusion of the incisors and simultaneous protection of the tongue
Description:
The tongue is kept from the teeth because of the tongue loop which follows the curve of the dental arch
The models are set into the fixator with the construction bite and the vertical opening is determined. The labial bows are bent as usual. The connecting bow in the lower jaw and the Coffin spring in the upper jaw are fixed each 1 mm from the gingival tissue. The divided tongue crib is fixed parallel to the lingual or palatal area of the incisors.
The tongue crib consists of two divided loops. For the first half, the wire is bent back 180° in the middle. The separation of the parallel wires corresponds to half of the area to be closed off. The loop is bent according to the curvature of the anterior segment. Both wire ends are bent over for retention and are anchored in the lateral part of the activator. The second half is bent like a mirror image and is set on the other side.
The acrylic body of the open activator is designed quite delicately. The anterior open base and the adapted tongue crib make this a well accepted appliance by patients.
