Studies on polishing of Ti and Ag-Pd-Cu-Au alloy with five dental abrasives

Titanium (Ti) and Ag-Pd-Cu-Au alloy were examined for their polishing behav iour by conducting manually controlled polishing tests using five dental ab rasives [carborundum point (CR) and silicone points (R1 and R2)] driven by a high torque micromotor with rotational speeds ranging from 2000 to 15 000 r.p.m. Polishing of Ti resulted in less volume of removal upon polishing, a rougher surface and larger loss of abrasives, compared with polishing of Ag-Pd-Cu-Au alloy. Polishing of Ti with a rotational speed of 15 000 r.p.m. led to the largest volume of removal upon polishing, whilst that of 10 000 r.p.m. produced the optimal volume for Ag-Pd-Cu-Au alloy. It was concluded that Ti was much more difficult to polish, requiring special care (e.g. fr equent exchange of abrasives). Development of new abrasives for polishing T i is required.