title: Principles of retention in orthodontia. 1920.
authors.forename: Calvin S
authors.initials: CS
authors.lastname: Case
mesh_terms: D049673:History, 20th Century; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000266:history; D008313:Malocclusion, Angle Class III / Q000266:history; D018704:Orthodontic Retainers / Q000266:history; D009971:Orthodontics, Corrective / Q000266:history*; D055502:Secondary Prevention