Bond Strength of Composite Resin to Surface-Treated Alumina Ceramic

Aim: This study aimed to evaluate the shear bond strengths of two adhesive resin cements to surface-treated Procera AllCeram core material. Methods: 150 paired high purity alumina ceramic cylinders were provided by Procera Sandvik ®. 120 paired cylinders were surface treated with either 50µm (grps 1,7) 65µm (grps 2,8), 110µm (grps 3,9), or 125µm (grps 4,10) alumina particles for 20 seconds(s) and divided into 8 groups (4 x 20: grps 1,2,3,4) and 4 x 10: grps (7,8,9,10). Thirty paired cylinders were silica-coated for 10 s using the Cojet System ® and divided into 3 x 10 (grps 5,6,11). Grp 5 received 1 coat of Espe sil, grps 6,11 received 3 coats. The adherend surfaces of the cylinders were prepared according to the manufacturer's instructions for each cement. Paired cylinders were cemented with either Panavia 21 resin cement (grps 1-6) or Nexus 2 (grps 7-11) using a vertical load of 1kg for 3 minutes in a cementation jig prior to light curing for 2 x 40s. They were stored in distilled water at 37º for 24 hours and transferred to a test jig. A shear load was applied to the cement in an Instron Testing Machine at speed of 0.5mm/min. Statistical analysis included ANOVA and a post-hoc least significant difference multiple comparison testing. Results: There was a statistical significant difference (p<0.05) between groups sandblasted with different particle sizes of alumina and cemented with Panavia 21, 65µm providing the highest mean shear bond strength. Significant differences (p<0.05) were found between groups cemented with Nexus 2, treatment with Cojet (grp 11) produced the highest shear bond strength. Conclusions: Highest bond strengths were achieved with cylinders cemented with Panavia 21 after 65µm surface treatment but these were not significantly different to those achieved with the Cojet system and either Panavia 21 or Nexus 2.