title: Early years of the American Board of Periodontology and the Advisory Board for Dental specialties.
mesh_terms: D002568:Certification / Q000266:history*; D049673:History, 20th Century; D010517:Periodontics / Q000266:history*; D013038:Specialization; D013039:Specialties, Dental / Q000266:history*; D014481:United States