For retention, a piece of multistrand wire, as a fixed retainer, was adapted to the lingual surfaces of the upper incisors and bonded using a light-curable adhesive resin.

Lingual braces attach to the back of teeth, a procedure made possible by robotic technology, says Dr. Paul Rossouw, chair of orthodontics at the University of North Carolina at Chapel Hill.

PHILADELPHIA-- ( BUSINESS WIRE )--Dr. Benjamin A. Cassalia introduces his exclusive LingualWirelign system for straightening teeth both quickly and painlessly.

3M has asserted U.S. Patents 6,776,614, 7,811,087, and 7,850,451, each entitled “Modular System for Customized Orthodontic Appliances” cover 3M™ Unitek™ Incognito™ Lingual Braces.