Invisalign Strategy # 3: Upper laterals
Invisalign setup for optimal rotation and extrusion of upper laterals
The extrusion of upper laterals is notoriously unpredictable movement to accomplish with Invisalign clear aligners. The reason for this difficulty is a lack of undercuts and a small clinical crown.
Often times extrusion and rotation are indicated and it is necessary to breakdown these two components into separate movements. Here are the instructions given to the Invisalign technician and a video to help visualize the concept.
Another advantage of dividing the movement into two stages is that if necessary, a bootstrap technique can be used to complete the extrusion. I will post another video showing proper boot strap setup.
Instructions given to Invisalign Technician
– Setup movement of upper laterals in two stages…
First : open 0.1 mm space mesial and distal to upper laterals and correct rotation of upper laterals by a combination of labial tipping and facial bodily movement; while correcting rotation.
Second: Apply extrusion and lingual tipping to upper laterals in a 1:1 ratio