Effect of Methacrylate-based Resin Cements on Tensile Bond Strength of Zirconia Copings on Zirconia Abutments

Purpose: The purpose of this study was to compare the retention of zirconia copings cemented onto zirconia implant abutments using four methacrylate-based resin cements and a temporary cement. Materials and Methods: Fifty zirconia copings (Cercon Base) and 10 zirconia abutments (Procera Esthetic Abutments) were fabricated and cemented using four methacrylate-based resin cements and one temporary cement (n = 10). All copings were thermal cycled and the tensile bond strength of the copings was recorded using universal testing machine. One-way analysis of variance (ANOVA) and Tamhane's T2 tests were used for statistical analysis. Results: Retention values of different cements presented significant differences (P < 0.01). The methacrylate-based resin cements [Premier: 127,95 (± 19,18), Dentotemp: 110 (± 15,48), Cem-implant: 70,38 (± 12,11), Improv: 69,64 (± 16,63)] had more retention than the temporary cement [Tempbond:36,92 (±6,2)].With a higher percentage (78%), cement failure occurred at the cement/abutment interface and the cement remained mostly within the zirconia coping. Conclusion: The cement type may have an influence on the retention of zirconia copings cemented onto zirconia implant abutments. The ranking of the methacrylate-based resin cements used, may direct the cement preference of a clinician in terms of providing desired retention.