James W. Little, DMD, MS, Professor Emeritus, University of Minnesota School of Dentistry-Minneapolis, MN, Donald Falace, DMD, University of Kentucky, College of Dentistry, Department of Oral Health Science, Lexington, KY, Craig Miller, DMD, MS, University of Kentucky, Department of Oral Health Science, College of Dentistry, Lexington, KY, USA and Nelson L. Rhodus, DMD, MPH, Morse Distinguished Professor and Director, Division of Oral Medicine, Oral Diagnosis and Oral Radiology, University of Minnesota, School of Dentistry and College of Medicine, Minneapolis, MN