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Anatomic CAD-CAM post-and-core systems: A mastication simulation study.

Ali Altitinchi¹, Alabbas Hussein², Siggi Saemundsson³

¹Post-Doc, Division of Oral and Craniofacial Health Sciences, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC.

The Journal of Prosthetic Dentistry

|September 26, 2022

Summary

This summary is machine-generated.

Cast metal and zirconia post-and-core systems demonstrated superior fatigue resistance compared to fiber-reinforced options in simulated chewing. Fiber-reinforced posts fractured prematurely, highlighting material differences in durability.

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Area of Science:

Dental Materials Science
Biomaterials Engineering
Restorative Dentistry

Background:

Limited research exists on post-and-core system performance under masticatory stress.
Simulating clinical conditions is crucial for accurate post-and-core system evaluation.

Purpose of the Study:

To compare the fatigue resistance of cast metal, prefabricated fiber, and CAD-CAM fabricated nonmetal post-and-core systems.
Evaluate the in vitro performance of different post-and-core materials under simulated clinical conditions.

Main Methods:

Forty endodontically treated human premolars were divided into four groups: cast metal, zirconia, fiber-reinforced composite resin, and prefabricated fiber posts.
Materials were fabricated conventionally or via CAD-CAM technology.
Specimens underwent 1.2 million mastication cycles and 10,000 thermocycles (5°C-55°C), with failure analysis.

Main Results:

Cast metal and zirconia post-and-core systems exhibited comparable and significantly higher fatigue resistance than fiber-reinforced systems.
Fiber-reinforced composite resin and prefabricated fiber posts failed between 504,000 and 752,000 cycles.
Failures in fiber-reinforced groups occurred at the cervical tooth portion.

Conclusions:

Cast metal and zirconia post-and-core systems possess superior physical properties and fatigue resistance.
Fiber-reinforced post-and-core systems showed lower fatigue resistance and were more prone to premature failure.