الفهرس 
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Abstract
Aim: To evaluate the influence of various surface treatments (Sandblasting, acid etching and silica-coating/silane) on the bond strength and mode of failure of PEKK post compared to fiber post.
Materials and Methods: Thirty-six extracted mandibular first premolar with comparable configuration were selected and endodontically treated, and standardized post spaces have been prepared. After that, the teeth were randomly distributed into four equal groups (n=9): group A (Control group) prefabricated silanated fiber post, group B: PEKK posts sandblasting with silica modified aluminum oxide, then apply silane coupling agent, group C: PEKK Posts sandblasting with 110 μm aluminum oxide, group D: PEKK posts etching with 98% sulfuric acid. The PEKK posts were milled from PEKK blank (Pekkton). All posts have been bonded using self-adhesive resin cement. Coronal section was obtained from each sample by Isomet 4000. Bond strength was then measured using push-out test. A universal testing machine was used at across head speed of 1 mm/min until failure occurred, and modes of failure were evaluated by stereomicroscope. ANOVA One Way analysis of Variance (ANOVA) test was used followed by Tukey`s post hoc test for multiple comparisons. Failure mode of all groups was performed using by Chi square test.
Results: Control group A recorded the highest push-out bond strength (17.32 ± 2.56 MPa) followed by aluminium oxide silica coated sandblasted group B (12.91 ± 1.95 MPa) then sulfuric acid etched group D (9.78 ± 0.96 MPa), while the lowest bond strength has been recorded with aluminium oxide sandblasted group C (9.38 ± 1.47 MPa). Comparison between different groups (group A & all other groups \ group B & all other groups) revealed significant difference between them (P < 0.05). group C & group D showed insignificant difference (P > 0.05).
Conclusion: Glass fiber post reported higher push-out bond strength than PEKK post regardless different tested surface treatment modalities. Furthermore, the PEKK posts, blasted with silica modified aluminium oxide particles and coated with silane, showed a significant advantage for bonding, and may be promising surface treatment modality for PEKK post. Also, aluminium oxide blasting can be used as an alternative surface treatment to PEKK posts rather than etching with 98% sulfuric acid.
Keywords: Post, PEKK, Push-out, bond strength, surface treatment.