Ronald L. Sakaguchi, DDS, PhD, MS, MBA, Associate Dean for Technology and Innovation, Professor, Biomaterials & Biomechanics, Department of Restorative Dentistry, Oregon Health & Science University, Portland, OR, USA and John M. Powers, PhD, Senior Vice President and Editor, The Dental Advisor, Dental Consultants, Inc., Ann Arbor, Michigan; Professor of Oral Biomaterials, Department of Restorative Dentistry and Biomaterials, University of Texas Dental Branch at Houston, Houston, Texas