Comparing the marginal leakage and retention of implant-supported restorations cemented by four different dental cements

Abstract

Background: Despite the wide use of implants in dentistry, there is insufficient information about the ideal cement for retention. Purpose: To determine the cement bond strength and marginal leakage of crown and partial denture cemented to implant abutments by four different types of cement. Materials and Methods: Eighty-four direct abutments were divided into eight groups (n = 7). Fifty-six crown and bridge restorations were cemented using zinc phosphate (ZM), temporary cement (TM), resin-modified glass-ionomer cement (GM), and self-adhesive resin cement (RM). After cementation, thermal cycling and incubation in basic fuchsin dye was applied. The maximum load to failure, marginal leakage, and fracture modes were evaluated. Results: The mean of retention strength for the bridges (874 N) was higher than the crown samples (705 N) (P =.005). The mean of retention strength for each cement group was ZM = 1298, RM = 1027, GM = 646, and TM = 187 N (P ≤.0001). Marginal leakage was recorded in majority of the samples; the highest incidence was detected for ZM samples. The cement fracture was mostly adhesive in nature. Conclusion: Self-adhesive resin and resin-modified glass ionomer cement had better mechanical properties to retain implant supported restorations.