Retention of implant-supported zirconia copings over short zirconia and titanium abutments using four different luting agents

Abstract

Background: The retention of cement retained implant-supported restorations can be affected different luting agents and abutment types. This is significant because success of cement-retained implant-supported restorations depends on adequate retention. Objectives: The aim of this study was to evaluate the retentive strength of different luting cements of zirconia restorations, performed on short titanium and zirconia abutments. Materials and Methods: Totally, 32 titanium abutments were shortened from 8 to 3 mm in height. Zirconia abutments were produced from this assembly, using a computer-aided design/computer-aided manufacturing (CAD/CAM) system. Zirconia copings were produced using a CAD/CAM system individually for titanium abutments and zirconia abutments. Four different cements were used in the study: polycarboxylate cement, dual composite resin cement, self-adhesive composite resin cement, and implant cement. A universal testing machine was used to test the cement failure load values for each specimen. Results: In zirconia abutments, the highest tensile strength mean value found was for self-adhesive resin cement (367,89 N), followed by the dual-cured resin cement (111,69 N), polycarboxylate (67,17 N) and the implant cement (60,42 N). In titanium abutments, the highest tensile strength mean value found was for self-adhesive resin cement (227,22 N), followed by the polycarboxylate (57,87 N), implant cement (54,39 N), and dual-cured resin cement (53,01 N). Conclusion: In light of the results obtained in this study, the self-adhesive resin cement presented higher tensile strength. Retentive strengths of the same size zirconia abutments are greater than those of titanium abutments.