Richard W. Brand, B.S., D.D.S. (Professor Emeritus Washington University School of Medicine, St. Louis, Missouri), Donald E. Isselhard, B.S., D.D.S., F.A.G.D., M.A.G.D., M.B.A. (Private Practice, St. Louis, Missouri) ; workbook questions contributed by Elaine Satin, R.D.H., M.S. (Former Program Coordinator of Dental Hygiene, Bergen Community College, Paramus, New Jersey).