Retention of castings with glass ionomer cement

The retentive abilities of a glass ionomer cement, a zinc phosphate cement, and a zinc silicophosphate cement were compared using 20 cast-gold inlays. The mean retentive strength of the glass ionomer cement was the greatest and that of the zinc phosphate cement the weakest. The differences between the mean retentive strengths of all three cements were statistically significant (p = .001).