In vitro tensile bond strength of adhesive cements to new post materials

Purpose: The purpose of this study was to measure the in vitro tensile bond strength of 3 types of adhesive resin cements to stainless steel, titanium , carbon fiber-reinforced resin, and zirconium oxide post materials. Materi als and Methods: Disks of post materials were polished to 600 grit, air abr aded, and ultrasonically cleaned. Zirconium oxide bonding surfaces were pre treated with hydrofluoric acid and silanated. Bis-Core, C&B Metabond, and P anavia cements were bonded to the post specimens and placed in a humidor fo r 24 hours. Post specimens were debonded in tension. Means and standard dev iations (n = 5) were analyzed by 2-way analysis of variance. Tukey-Kramer i ntervals at the 0.05 significance level were calculated. Failure modes were observed. Results: Panavia 21 provided the highest bond strengths for all types of post materials, ranging from 22 MPa (zirconium oxide) to 37 MPa (t itanium). C&B Metabond bonded significantly more strongly to stainless stee l (27 MPa) and titanium (22 MPa) than to zirconium oxide (7 MPa). Bis-Core results were the lowest, ranging from 16 MPa (stainless steel) to 8 MPa (zi rconium oxide). In most cases, bonds to carbon fiber post materials were we aker than to stainless steel and titanium, but stronger than to zirconium o xide. In general, higher bond strengths resulted in a higher percentage of cohesive failures within the cement. Conclusion: Panavia 21 provided the hi ghest bond strengths to all post materials, followed by C&B Metabond. In mo st cases, adhesive resins had higher bond strengths to stainless steel, tit anium, and carbon fiber than to zirconium oxide.