title: A Philadelphia fable: how ideal occlusion became the philosopher's stone of orthodontics.
authors.forename: James L
authors.initials: JL
authors.lastname: Ackerman
authors.forename: Marc B
authors.initials: MB
authors.lastname: Ackerman
authors.forename: Martin R
authors.initials: MR
authors.lastname: Kean
mesh_terms: D003766:Dental Occlusion; D006801:Humans; D009970:Orthodontics / Q000592:standards*; D015143:Philadelphia; D010685:Philosophy, Dental