Fracture strength of cad-cam milled polyetheretherketone (PEEK) post-cores <i>vs</i> conventional post-cores; an <i>in vitro</i> study

In our study, zirconia and metal post-core samples showed higher average fracture strength values than PEEK post-cores groups. Repairable failure modes were more common in the zirconia post-cores, whereas the opposite was observed in the other groups. Further experimental and clinical trial studies are needed before PEEK materials can be used as post materials in the clinic.