Retentive Strengths for Prefabricated Primary Molar Zirconia Crowns Using Five Different Cements

Purpose: To assess retentive strengths of 5 commercially available cements with prefabricated primary molar zirconia crowns.

Methods: Seventy ve prefabricated primary molar zirconia crowns were cemented on extracted human teeth using 5 di erent cements (Ketac Cem Maxicap, FujiCEM 2, BioCem, RelyX Unicem 2 and RelyX Luting Plus Automix N= 15 per group). Following thermocycling, 5000 cycles from 5º to 55º C, crown retentive strengths data were collected and statistically analyzed using one-way ANOVA with LSD post hoc test (P< 0.05).

Results: Mean retentive strengths are: Ketac Cem 482.4 N±87, FujiCEM 2 354.9 N±121, BioCem 462.7 N±138, RelyX Unicem 2 409.0 N±171 and RelyX Luting 233.5 N±170. e retentive strengths were statistically signi cant (P= 0.014) among the 5 groups, but not the cement failure rankings (P= 0.47). Conclusions: There is a significant difference in the retentive strengths for cementing prefabricated primary molar zirconia crowns among the 5 different cements. Ketac Cem has the highest retention force, followed by BioCem, RelyX Unicem, Fuji CEM II, and RelyX Luting. e majority of cement failures occurred between the cement and the tooth.