[Influence of luting cement on corrosion of crown-covered post and core systems (2nd publication)]

This publication describes phantom experiments to determine the ohmic resistance of four luting materials (Harvard, Tenet, Durelon, Ketac CEM) and one root filling paste (Diaket) used to cement metal crowns on roots with cast post and core. A uniform cement layer of 2/10 mm was assumed. The electrolyte used to simulate the oral fluid was physiological NaCl solution. Under these selected conditions only two products showed a sufficiently high resistance to prevent corrosion currents. On the basis of these results attention should be paid under practical conditions to the proper selection of metals for post and core and crowns. If such conditions cannot be met, the cement gap must be of sufficient layer thickness and a luting material with high ohmic resistance and good resistance to humidity be selected.