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Related Experiment Videos

Thermal and cyclic loading of endodontic posts.

J L Drummond1, T R Toepke, T J King

  • 1Department of Restorative Dentistry, University of Illinois at Chicago, 60612-7212, USA. drummond@uic.edu

European Journal of Oral Sciences
|July 29, 1999
PubMed
Summary

This study evaluated the pullout strength of carbon and stainless steel posts in teeth under various conditions. No significant differences were found between post types or conditions, though operator experience impacted results.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Dental posts are crucial for restoring endodontically treated teeth.
  • Understanding the bond strength and durability of different post materials is essential for clinical success.
  • Carbon and stainless steel posts are commonly used, each with distinct mechanical properties.

Purpose of the Study:

  • To determine and compare the pullout (shear) strength of carbon and stainless steel serrated posts cemented in human teeth.
  • To evaluate the effect of thermal cycling, load cycling, and combined cycling on post-tooth bond strength.
  • To assess the influence of surface treatment (alumina abrasion) and operator experience on carbon post bond strength.

Main Methods:

  • Human extracted third molars were embedded in acrylic, and post spaces were prepared.

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  • Carbon and stainless steel posts were cemented using resin cement.
  • Specimens were subjected to control, thermal-cycled, load-cycled (at 45° or along long axis), and combined cycling conditions.
  • Pullout (shear) strength was tested in tension at a rate of 2 mm/min.
  • Carbon posts were also tested with and without 50 µm alumina abrasion, with two operators.

    • Main Results:

    • No statistically significant differences in pullout (shear) strength were observed between control, load-cycled, and thermal-cycled stainless steel post groups.
    • Carbon posts subjected to combined thermal and load cycling fractured during testing.
    • Alumina abrasion of carbon posts significantly decreased their bond strength.
    • Operator experience was identified as a significant factor influencing bond strength, particularly for carbon posts.

    Conclusions:

    • Under the tested conditions, neither carbon nor stainless steel posts demonstrated a significant difference in pullout strength.
    • Thermal and mechanical stresses did not significantly degrade the bond strength of stainless steel posts within the study's parameters.
    • Surface preparation and operator variability play critical roles in the bond strength of carbon fiber posts, highlighting the need for standardized clinical protocols.