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Related Experiment Videos

Bond strength between cements and metals used for endodontic posts.

B H Miller1, H Nakajima, J M Powers

  • 1Department of Biomaterials Science, Baylor College of Dentistry, Texas A&M University System, Dallas, USA. bmiller@tambcd.edu

Dental Materials : Official Publication of the Academy of Dental Materials
|June 24, 1999
PubMed
Summary

The interaction between metal posts and dental cements is crucial for bond strength. Optimizing the metal-cement combination is key to preventing fractures in non-vital teeth.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Metal endodontic posts are used in non-vital teeth to prevent fractures.
  • Evaluating cement bond strength for post retention is challenging due to multiple interfaces.
  • Isolating the metal/cement interface is necessary for accurate tensile bond strength testing.

Purpose of the Study:

  • To isolate the metal/cement interface for tensile bond strength testing.
  • To microscopically observe the bond interface and failure modes.
  • To determine the influence of different metal and cement combinations on bond strength.

Main Methods:

  • Tensile bond strength was tested using a truncated cone tensile test with three metals and seven cement treatments.

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  • Data were analyzed using two-way ANOVA and Scheffé's multiple comparison test (p=0.05).
  • Specimens were examined at 50x magnification for failure modes and 500x with scanning electron microscopy for surface observation.

    • Main Results:

    • Significant differences in tensile bond strengths were observed among cements within certain metal groups.
    • Microscopic analysis revealed varied failure modes (adhesive, cohesive, mixed) depending on the metal-cement combination.
    • The interaction between metal and cement critically determined bond strength and fracture characteristics.

    Conclusions:

    • Certain cement treatments exhibited superior bond strength with specific metals.
    • The bond strength of some cements remained consistent across different metals.
    • Material selection is critical for maximizing bond strength at the metal/cement interface.