Frictional Forces of Three Types of Lingual Appliance with Self-ligating Mechanisms.

Aim And Objective: The present study compared the frictional forces of three types of self-ligating lingual appliances.

Materials And Methods: The lingual appliances (2D, Forestadent; Alias, Ormco; and Clippy L, Tomy International) consisted of a self-ligating bracket (second premolar) and two self-ligating tubes (first and second molars) bonded to a stainless steel jig and attached to a "drawing-friction tester." Full-size and non-full-size stainless steel archwires were tested, and the static and kinetic friction acting on six lingual appliance/wire combinations was estimated ( = 5).