A Comparative Assessment of Bond Strength of PEEK Crowns to Natural Teeth with Two Different Resin Cements

Statement of problem: For a successful clinical outcome, luting agents should have a high bond strength. Bond failure is still one of the main reasons of restoration failures. Purpose: The purpose of this study was to evaluate tensile bond strength of PEEK with two different resin cements. Materials and methodology: Two self-adhesive cements (RelyX Unicem, G-CEM LinkAce), twenty permanent human premolars were used. In the present experimental study, teeth were prepared to receive copings with a chamfer bur at high speed cooled with an air/water spray. PEEK copings were fabricated and specimens were divided into two groups based on the type of cement used. The tensile load required to de-bond the crowns was measured using universal testing machine with a cross speed of 1mm/min. The data was analysed by paired t test. Results: The maximum and minimum amounts of bond strength were seen in RelyX Unicem and G-CEM LinkAce cements respectively. Despite this different bond values in cements, paired t test disclosed significant difference between groups in the mean amount of bond strength (p-value=0.05). Conclusion: Regarding the results of the study, it was concluded that G-CEM LinkAce presented higher bond strength.