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Stress distribution surrounding endodontic posts.

D A Burns1, W R Krause, H B Douglas

  • 1Department of Endodontics, Virginia Commonwealth University, School of Dentistry, Richmond.

The Journal of Prosthetic Dentistry
|October 1, 1990
PubMed
Summary
This summary is machine-generated.

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This study found that Para-Post and Para-Post Plus prefabricated posts distribute stress evenly, unlike Flexi-Post which concentrates stress. This research aids in selecting optimal endodontic posts for better dental restoration outcomes.

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Biomechanics

Background:

  • Prefabricated endodontic posts are widely used for restoring endodontically treated teeth.
  • Understanding stress distribution is crucial for post longevity and preventing complications.
  • Different post designs may influence stress patterns within the root canal system.

Purpose of the Study:

  • To compare the stress distribution patterns of three different prefabricated endodontic post designs.
  • To evaluate stress under various loading conditions (compressive and oblique) and post dimensions.
  • To identify which post design exhibits more favorable stress distribution for clinical application.

Main Methods:

  • Photoelastic material blocks with simulated root canals were used.

Related Experiment Videos

  • Three types of prefabricated posts (Para-Post, Para-Post Plus, Flexi-Post) were tested in varying lengths and diameters.
  • Stress distribution was analyzed using circular polariscopy under static, compressive (135 N), and oblique (90 N/135 N at 26 degrees) forces.

    • Main Results:

    • Para-Post and Para-Post Plus posts demonstrated similar, even stress distribution patterns across tested parameters.
    • Flexi-Post exhibited asymmetric stress patterns with stress concentration at the threads.
    • Flexi-Post showed significantly higher shoulder and coronal stresses compared to Para-Post and Para-Post Plus, especially after cementation and during compressive loading.

    Conclusions:

    • Para-Post and Para-Post Plus offer more favorable stress distribution compared to Flexi-Post.
    • The design of the Flexi-Post, with its threads, leads to localized stress concentrations.
    • These findings have implications for the selection of prefabricated posts to minimize stress-related failures in endodontically treated teeth.