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Related Experiment Videos

Resistance to cyclic loading of teeth restored with posts.

A Sahafi1, A Peutzfeldt, G Ravnholt

  • 1Department of Prosthetic Dentistry, School of Dentistry, University of Copenhagen, Nörre Allé 20, DK-2200 , Copenhagen N, Denmark. ars@odont.ku.dk

Clinical Oral Investigations
|March 5, 2005
PubMed
Summary

Crowned teeth without posts showed superior cyclic loading resistance. Post surface treatment significantly improved resistance, making it recommended when posts are necessary for dental restorations.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Prosthodontics

Background:

  • Dental posts and cores are used to retain crowns on endodontically treated teeth.
  • The ferrule design is crucial for reinforcing tooth structure and improving restoration longevity.
  • Understanding the influence of post characteristics on mechanical resistance is vital for clinical success.

Purpose of the Study:

  • To evaluate how the presence of posts and cores, and the characteristics of posts (shape, type, surface treatment), affect the cyclic loading resistance of crowned human teeth.
  • To compare the mechanical performance of different post systems and surface treatments under simulated chewing forces.

Main Methods:

  • An in vitro study using human teeth restored with sterling silver crowns without a ferrule.

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  • Teeth were subjected to cyclic loading (600 N at 2 Hz) until failure.
  • Evaluated were teeth with crowns only, cores only, post and cores, and variations in post type (cast, prefabricated), shape (parallel-sided, tapered), material (titanium alloy, glass fiber composite, zirconia), and surface treatment.

    • Main Results:

    • Teeth restored with crowns only exhibited significantly higher cyclic loading resistance than those with cores or post and cores.
    • No significant difference in resistance was found between cores only and post and cores, regardless of post surface treatment.
    • Parallel-sided cast posts showed higher resistance than tapered cast posts or untreated prefabricated posts (titanium alloy, glass fiber composite).
    • Parallel-sided cast posts and zirconia posts showed comparable resistance.
    • Surface-treated posts demonstrated significantly increased resistance compared to untreated posts.

    Conclusions:

    • Crowning without posts offers superior resistance to cyclic loading compared to restorations involving posts and cores.
    • When posts are necessary, surface treatment significantly enhances their resistance to cyclic loading.
    • The choice of post material and design, particularly parallel-sided cast posts and surface-treated options, can influence restoration durability.