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Crown retention and cyclic loading (in vitro)

A Gundler1, P Lockowandt, S Erhardson

  • 1Department of Dental Materials and Technology, Karolinska Institutet, Huddinge, Sweden.

Scandinavian Journal of Dental Research
|August 1, 1993
PubMed
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The smallest convergence angle (20 degrees) provided superior cast gold crown retention compared to larger angles. Tooth preparation variables like surface roughness and size did not significantly impact crown retention in this study.

Area of Science:

  • Dental materials science
  • Biomaterials engineering
  • Prosthodontics

Background:

  • Dental crowns are crucial for restoring tooth function and aesthetics.
  • Understanding factors influencing crown retention is essential for long-term restoration success.
  • Zinc phosphate cement is a commonly used luting agent for dental restorations.

Purpose of the Study:

  • To investigate the correlation between cast gold crown retention and preparation variables.
  • To determine the influence of convergence angle, surface roughness, and preparation dimensions on crown retention.
  • To evaluate the effectiveness of zinc phosphate cement under cyclic loading conditions.

Main Methods:

  • Extracted human teeth were prepared and restored with cast gold crowns.

Related Experiment Videos

  • Teeth were luted using zinc phosphate cement.
  • A fatigue test involving cyclic loading was performed to assess crown retention.
  • Three convergence angles (20, 40, and 60 degrees) were tested.

    • Main Results:

    • The 20-degree convergence angle demonstrated significantly better crown retention compared to 40 and 60 degrees.
    • Surface roughness, preparation height, base diameter, and surface size did not show a significant influence on retention within the tested ranges.
    • Cyclic loading revealed differences in retention based on preparation geometry.

    Conclusions:

    • Minimizing the convergence angle is a critical factor for enhancing cast gold crown retention.
    • Standard preparation parameters like surface characteristics and dimensions may have less impact on retention than taper angle.
    • These findings have implications for optimizing dental preparation design for improved crown stability.