1 Operative Dentistry Department, University of Iowa, S-246 Dental Science Building, Iowa City, IA 52242-1001, USA. Electronic address: Sandra-guzman-armstrong@uiowa.edu.
2 Department of Cariology, Restorative Sciences & Endodontics, University of Michigan School of Dentistry, 1011 North University, Room 2393, Ann Arbor, MI 48109-1078, USA. Electronic address: mfontan@umich.edu.
3 Department of Restorative Dental Sciences, University of Florida College of Dentistry, 1395 Center Drive, Room D9-6, Gainesville, FL 32610-0415, USA. Electronic address: mnascimento@dental.ufl.edu.
4 Department of Comprehensive Care, Tufts University School of Dental Medicine, 1 Kneeland Street, Room 416, Boston, MA 02111, USA. Electronic address: Andrea.Zandona@tufts.edu.