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Related Experiment Videos

Retention and failure mode after cyclic loading in two post and core systems

R Stegaroiu1, H Yamada, H Kusakari

  • 1Department of Fixed Prosthodontics, Niigata University, School of Dentistry, Japan.

The Journal of Prosthetic Dentistry
|May 1, 1996
PubMed
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For extensively prepared anterior maxillary teeth, cast post and core restorations offer better retention than prefabricated posts, especially under cyclic loading conditions. Proper fit is crucial for restoration longevity.

Area of Science:

  • Restorative Dentistry
  • Biomaterials Science
  • Dental Mechanics

Background:

  • Prefabricated and cast post and core systems are used for restoring endodontically treated teeth.
  • Extensive coronal preparation can compromise the retention of post and core restorations.
  • Cyclic loading is a common factor affecting the long-term stability of dental restorations.

Purpose of the Study:

  • To compare the retention of prefabricated post and composite resin core systems versus cast post and core restorations.
  • To evaluate the influence of cyclic loading on the retention of these restorative systems in anterior maxillary teeth.

Main Methods:

  • Anterior maxillary teeth with enlarged coronal root canal preparations were restored using either prefabricated or cast post and core systems.

Related Experiment Videos

  • Restorations were subjected to cyclic loading to simulate intraoral conditions.
  • Retention was assessed by measuring the force required for dislodgement, and failure modes were analyzed.

    • Main Results:

    • Under non-loaded conditions, post type did not significantly affect restoration retention.
    • Cyclic loading reduced the retention of prefabricated post restorations significantly compared to loaded cast restorations and non-loaded prefabricated restorations.
    • Failure mode analysis provided insights into the mechanisms of dislodgement for each system.

    Conclusions:

    • For teeth requiring extensive coronal preparation, cast post and core restorations demonstrate superior retention compared to prefabricated systems, particularly when subjected to functional stresses.
    • A well-adapted cast post and core may be preferable to a prefabricated post that does not perfectly match the canal morphology in challenging clinical situations.
    • The findings highlight the importance of material selection and fit for ensuring the long-term success of post and core restorations in compromised teeth.