Visual Guide for Individualized Inclination of Twin Block Appliance

The Twin Block appliance is one of the most preferred functional appliances for the treatment of skeletal Class II malocclusion in growing children. Conventionally, the inclines of the Twin Block appliance are kept at a 70° angle, based on the angle between the hinge axis of opening, which is approximately 70° to the occlusal plane. But this angle is not constant for each individual and can vary based on individual cuspal inclines and condylar morphology. The present article describes a simple visual method for individualized Twin Block angulation based on the individual’s own cuspal inclines.