Kwok-Hung Chung1, Chandur Wadhwani2, David R Cagna3. 1. Professor, Department of Restorative Dentistry, University of Washington, Seattle, Wash. Electronic address: akchung@u.washington.edu. 2. Private practice, Bellevue, Wash. 3. Professor and Director of Advanced Prosthodontics Program, Department of Prosthodontics, and Associate Dean of Postgraduate Affairs, UTHSC College of Dentistry, Memphis, Tenn.