Optimal Cement Space for Resin Luting Cements

Stainless steel dies, simulating 0 to 80 microns of die spacing, were seated into a machined brass crown with Phosphacap, Panavia EX, and C & B Metabond. The seating discrepancy after 60 seconds was measured to determine the optimal cement space for best seating for each agent. The most complete seating for crowns luted with zinc phosphate cement was observed when at least 40 microns of cement space was provided. C & B Metabond and Panavia required 30 microns of die spacing.