Effect of Different Surface Treatment on the Push Out Bond Strength of Polyether Ether Ketone Endodontic Post

The polyether ether ketone (PEEK) is a potential material for an endodontic post because of its favorable mechanical and esthetic properties. The major disadvantage of PEEK is its poor bonding to tooth structure due to its inert surface. The purpose of the study was to test the influence of air-abrasion and acid etching surface treatment on the push-out bond strength of PEEK endodontic post and radicular dentin. Custom made PEEK endodontic posts were milled with CAD-CAM by scanning the direct pattern resin post. The post surfaces were modified with 50 mu m aluminum oxide air-abrasion (n = 20) and 98% sulfuric acid etching (n = 20); ten samples were maintained as a control group with no surface treatment. The surfaces were conditioned with scotch bond universal adhesive and Monobond plus universal primer. The surface conditioned posts were subsequently cemented in their respective root canals with the self-adhesive resin luting cement. The roots were sectioned into 2 mm segments, subjected to push out bond strength by applying the load at 0.5 mm/minute speed. Obtained data were analyzed by two-way analysis of variance and Tukey comparison test at a significant difference level of 0.05. Push-out bond strength was greater in the combined surface modification of air-abrasion and scotch bond at 10.884 N. The acid etching with sulfuric acid and Monobond plus surface treatment showed less bond strength at 8.861 N. The bond strength in control groups was significantly lower at 5.992 N.