1. Research Associate, Capt., U.S. Navy, National Naval Dental Center
2. Research Associate, CPO (P), U.S. Navy, National Naval Dental Center
3. Research Associate, Lt. Col., U.S. Air Force
4. Guest Worker, Asst. Professor, Aichi Gaikuin University
5. Dental and Medical Materials Section, National Bureau of Standards, Washington, DC 20234