An orthodontic appliance such as a bracket is made of a polymeric material with reinforcing fiber structure embedded in the polymeric material. The reinforcing fiber structure includes relatively long filaments that extend about the perimeter of the bracket including the periphery of an archwire slot....http://www.google.com/patents/US5445770?utm_source=gb-gplus-sharePatent US5445770 - Method of manufacturing orthodontic appliance having reinforcing fiber preform
