Cyclic fatigue testing of five endodontic post designs supported by four core materials

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Endodontics

Background:

• Post-endodontic restorations require durable core materials to withstand occlusal forces.
• Evaluating the fatigue resistance of different post and core combinations is crucial for clinical longevity.

Purpose of the Study:

• To assess the cyclic fatigue performance of five endodontic post systems paired with four distinct core materials.
• To identify which core materials provide optimal support for endodontic posts under simulated masticatory stress.

Main Methods:

• In vitro cyclic fatigue testing simulating masticatory forces.
• Application of 22.2 N force for up to 4,000,000 cycles or until failure.
• Recording failure modes and cycles to failure, analyzed using two-way ANOVA.

Main Results:

• Endodontic posts with Ti-Core composite and Tytin silver amalgam core materials exhibited no failures.
• Ketac-Silver and G-C Miracle Mix core materials demonstrated premature failures, primarily in the core.
• Statistical analysis confirmed Ti-Core and Tytin silver amalgam's superiority over Ketac-Silver and G-C Miracle Mix.

Conclusions:

• Ti-Core composite and Tytin silver amalgam are superior core materials for endodontic posts regarding cyclic fatigue resistance.
• Ketac-Silver and G-C Miracle Mix show limitations in supporting endodontic posts under simulated masticatory loads.
• Material selection for post-endodontic core buildup significantly impacts restoration durability.