title: The bi-helix opening spring for lingual orthodontics.
authors.affiliation: Department of Orthodontics, School of Dental Medicine, St. Joseph University, Beirut. elieamm@hotmail.com
authors.forename: Elie William
authors.initials: EW
authors.lastname: Amm
mesh_terms: D000328:Adult; D004955:Esthetics, Dental; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy; D008875:Middle Aged; D016382:Orthodontic Appliance Design; D009969:Orthodontic Wires