The presentation will introduce the novel lingual appliance, the “antero-posterior lingual retractor (APLR)”, which aims the simultaneous intrusion and retraction of the anterior dental unit with sound biological milieu in bimaxillary protrusion or hyperdivergent class II cases. The appliance aims to move 6 anterior teeth bodily backward with intrusion of both anterior and posterior segment simultaneously, and consequently intrusion of the whole dentition results in counterclockwise autorotation of the mandible. The total outcome of the appliance will meet the demand of correcting the class II malocclusion with hyperdivergent face, open bite and gummy smile.
Learning Objectives:
After this lecture, attendees will be able to:
Comprehend the type of incisor movement according to the length of lever arms and the position of TADs during the incisor retraction in bicuspid extraction cases.
Gain competence to control incisor torque during the en-masse movement in bicuspid extraction treatment.
Understand the biomechanics of the antero-posterior lingual retractors, and can apply the appliance to class II hyperdivergent cases.
