ABSTRACT
Objectives: The primary aim of this research is to evaluate the durability of premolar crowns made from Polyetheretherketone (PEEK) after undergoing various surface treatment methods.
Materials& Methods: A set of twenty-five Polyetheretherketone (PEEK) crowns with full coverage were manufactured and thereafter affixed onto human maxillary premolars that had been appropriately prepped. The 25 crowns were classified into five distinct types according on the surface treatment utilized. The notion of control pertains to the capacity to manage or regulate variables with the intention of exerting influence over outcomes or preserving stability within a given system. Hydrofluoric acid (HF) with a concentration of 9.5% is being referred to. The solution under consideration is sulfuric acid with a concentration of 98%. The piranha solution is composed of sulfuric acid (H2SO4) at a concentration of 98% and hydrogen peroxide (H2O2) at a concentration of 30%. The experimental agent employed in this investigation was nitric acid, and each trial consisted of a sample size of 5. Following that, every crown sample was securely attached to its corresponding abutment using self-adhesive resin cement G-CEM. Following that, the specimens were subjected to a thermocycling protocol comprising of 5000 cycles, wherein the temperature oscillated between 5°C and 55°C. The pull-off test was performed utilizing a universal testing apparatus.

Conclusions: It is recommended to employ Piranha solution and 98% sulfuric acid for the purpose of treating the surface of PEEK, since this approach has been shown to result in a substantial improvement in retentive strength.