[Fracture resistance of the all-ceramic posts in post-and-core system]

To make a comparative study on the fracture resistance of the all-ceramic posts in post-and-core system where the ceramic core was combined with the post by direct sintering and by two other methods.

A total of 15 all-ceramic posts fabricated by alumina-zirconia nano-composite infiltrated ceramics were randomly divided into three groups. They were given the following treatments: Group A: forming and combining the ceramic core with the post by direct sintering; group B: combining the ceramic core with the post by use of 3M RelyX for adhesion; group C: forming composite resin core onto the post. Each specimen was placed into a special jig and subjected to a load perpendicular to the post axis on INSTRON 4302 universal testing instrument until failure. ANOVA was used for statistical analysis.

There was no statistically significant difference between the groups (P>0.05).

The findings indicate that the strength of the post remains uninfluenced during the combination of the core with the post by direct sintering.