1. Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109, United States
2. Department of Cariology, Restorative Sciences and Endodontics, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109, United States
3. Restorative Dentistry and Cariology at Institute of Dentistry, University of Turku, Turku 20014, Finland