Doppel appliance

It consists of an upper and a lower simple plate, with two large double helix finger springs ("snake teeth") pointing towards the tongue from the palatal anterior surface of the upper plate. The lingual surface of the lower plate is formed with a groove corresponding to the two finger springs, so that when clenched, the "snake teeth" position the mandible sagittally and transversely.

Preparation: on the basis of a construction bite on plaster models.

Activation: as with the plates, the pre-bite can be somewhat enhanced by pre-setting the "snake teeth".