title: Periodontics: past and present.
authors.forename: R M
authors.initials: RM
authors.lastname: Meffert
mesh_terms: D016301:Alveolar Bone Loss / Q000601:surgery*; D001861:Bone Regeneration; D016557:Guided Tissue Regeneration, Periodontal; D006801:Humans; D010517:Periodontics / Q000639:trends*