By 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 and 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