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Related Experiment Videos

Fatigue model to characterize cement-metal interface in dynamic shear

P C Chen1, J G Pinto, E H Mead

  • 1E. H. Mead Instruments, Leucadia, CA, USA.

Clinical Orthopaedics and Related Research
|May 29, 1998
PubMed
Summary

Light plasma sprayed surfaces show higher bond strength for polymethyl-methacrylate (PMMA) dental cements compared to grit-blasted surfaces. However, both surface treatments exhibit similar fatigue degradation rates, with plasma spraying potentially generating more debris.

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Area of Science:

  • Biomaterials Science
  • Dental Materials Engineering
  • Surface Science

Background:

  • Polymethyl-methacrylate (PMMA) is widely used in dental prosthetics.
  • Optimizing the interface between PMMA and metal alloys is crucial for restoration longevity.
  • Surface enhancements are employed to improve bond strength and mechanical integrity.

Purpose of the Study:

  • To evaluate the interface shear strength of vacuum-mixed PMMA bonded to cobalt-chrome (Co-Cr) substrates with two different surface treatments.
  • To compare the performance of grit-blasted versus light plasma-sprayed Co-Cr surfaces under static and dynamic shear loading.
  • To assess the fatigue resistance and failure modes of the PMMA-Co-Cr interface.

Main Methods:

  • Interface shear strength was assessed using static pullout tests on Co-Cr coupons with grit-blasted or light plasma-sprayed surfaces.

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  • Dynamic fatigue tests were conducted to evaluate degradation of interface strength under cyclic loading.
  • Specimens were prepared with a 2-mm cement mantle of vacuum-mixed PMMA.
  • Testing was performed using an Instron universal testing machine.

    • Main Results:

    • Light plasma-sprayed surfaces exhibited a significantly higher mean static pullout strength (18.46 MPa) compared to grit-blasted surfaces (13.78 MPa).
    • The rate of interface strength degradation under dynamic fatigue loading was comparable for both surface treatments.
    • Qualitative analysis indicated increased generation of metal and cement particles from the failed light plasma-sprayed surfaces.

    Conclusions:

    • Light plasma spraying enhances the static bond strength of PMMA to Co-Cr dental alloys.
    • While plasma spraying offers higher initial strength, fatigue resistance is similar to grit blasting.
    • Increased debris generation from plasma-sprayed surfaces warrants consideration in clinical applications.