Shear Bond Strength Evaluation of Contemporary Dental Cements on Zirconia

Objectives: Purpose of this study was to evaluate the shear strength bonding on monolithic zirconia utilizing six different dental cements.
Methods: Thirty rectangular (8x12x2mm) zirconia specimens per material: BruxZir, Katana, ZirCAD, and Lava were mounted in acrylic and abraded with 50μm alumina particles for 10 seconds, then air dry. Each specimen was prepared with a bonding agent (MonoBond Plus) and subsequent cement (Multilink, BioCem, GCem, SpeedCEM, RelyX, and Panavia) formed into plastic cylinder (n=20/cement/zirconia) and oriented for shear bond testing. Cements were tact-cured for 20 seconds with an Elipar™ DeepCure-S curing light. After the first cure, the plastic cylinder was removed, and the cement was cured again from each direction for 20 seconds. The bonded zirconia specimens were stored in a solution of deionized water at 37°C for 24 hours to allow curing. Specimen boned with GCem was stored in a separate container because of the glass ionomer base of the resin. Shear bond strength testing was performed on an UltraTester™ Bond Strength Testing Machine with a speed of 1.0mm/minute. Maximum stress (MPa) data were compared and statistically analyzed using a two-way repeated measure ANOVA SNK with P<0.05 for significance.
Results: Means and standard deviations test results and statistical info for shear bond strength are located in the table below.
Conclusions: Zirconia bonding with an array of different cements only demonstrated a significant greater difference in shear bond strength for GCem paired with Katana. When using Biocem, a slightly reduced shear bond strength was observed with BruxZir (P=0.02), Katana (P<0.001), and Zircad (P=0.034) using these methods.