Fracture resistance, 3-dimensional finite element analysis, and safety factors for five post-and-core restorations with crowns placed in the noncircular-shaped canals of premolars.

Statement Of Problem: Restoring endodontically treated premolars with noncircular canals presents a significant challenge.

Purpose: The purpose of this study was to compare the in vitro fracture resistance and the finite element computational calculation-based stress and safety factor of noncircular-shaped, endodontically treated premolars restored with 5 different prefabricated and custom computer-aided design and computer-aided manufactured post-and-core systems.

Material And Methods: Fifty single-rooted oval-shaped canal maxillary premolars were endodontically treated and post spaces were prepared.