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Related Experiment Videos

Surface roughness of two polished ceramic materials

M S Scurria1, J M Powers

  • 1Dept. of Prosthodontics, University of North Carolina, School of Dentistry, Chapel Hill.

The Journal of Prosthetic Dentistry
|February 1, 1994
PubMed
Summary

Polishing dental ceramics like Ceramco II and Dicor MGC is crucial for reducing surface roughness. Finishing diamond points followed by diamond gels yielded the smoothest ceramic surfaces, improving restoration quality.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Surface Science

Background:

  • Dental ceramic restorations often require intraoral adjustments.
  • These adjustments can increase surface roughness, potentially impacting restoration longevity and aesthetics.
  • Reducing surface roughness is essential for optimal clinical performance.

Purpose of the Study:

  • To evaluate the effectiveness of different polishing systems on reducing surface roughness of two dental ceramics.
  • To compare the surface smoothness achieved by various polishing sequences.
  • To identify optimal polishing methods for conventional and CAD-CAM ceramic restorations.

Main Methods:

  • Two types of dental ceramics (Ceramco II and Dicor MGC) were used.
  • Five distinct polishing systems involving diamond points, carbide burs, rubber points, diamond gels, and aluminum oxide pastes were tested.

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  • Surface roughness was quantified using profilometry (Ra measurements) on multiple specimens and replications.

    • Main Results:

    • Feldspathic porcelain achieved smoother surfaces post-polishing compared to glazed surfaces.
    • Dicor ceramic demonstrated superior polishability over Ceramco II ceramic.
    • A polishing sequence of finishing diamond points followed by diamond gels produced the smoothest surfaces.
    • A 30-fluted carbide bur did not enhance surface smoothness.
    • Aluminum oxide polishing systems proved effective, especially for Dicor ceramic.

    Conclusions:

    • Specific polishing sequences significantly influence the final surface roughness of dental ceramics.
    • Diamond-based polishing systems, particularly diamond points and gels, are highly effective for achieving smooth ceramic surfaces.
    • Material type impacts polishability, with Dicor ceramic showing better results than Ceramco II.
    • Optimized polishing protocols are vital for improving the clinical outcomes of ceramic restorations.