The Technique Refill traction system, or chain ligation system, is made for the treatment of altered eruption and impaction of teeth. It is available in three styles: Cuspid, Bicuspid, and Incisor exposing brackets, or orthodontic buttons. he ligation chain is 7/8" (22m) in length, and its 14k gold construction reduces irritation for the patient during the treatment of erupted and impacted teeth.