Journal of Prosthetic Dentistry
Volume 71, Issue 2 , Pages 174-177, February 1994

Surface roughness of two polished ceramic materials

  • Mark S. Scurria, DDS

      Affiliations

    • Corresponding Author InformationReprint requests to:Dr. Mark S. Scurria Department of Prosthodontics University of North Carolina School of Dentistry Brauer Hall, CB 7450Chapel Hill, NC 27599-7450.
    • Assistant Professor, Dept. of Prosthodontics.
    • ,
  • John M. Powers, PhD

      Affiliations

    • Professor, Department of Oral Biomaterials, University of Texas Health Science Center, Dental Branch, Houston, Tex.

University of North Carolina, School of Dentistry, Chapel Hill, N.C.

Conventional and CAD-CAM ceramic restorations often require adjustments that result in a need to reduce surface roughness. Surface roughness resulting from five polishing systems on two ceramics was assessed. Disks of Ceramco II and Dicor MGC ceramic blocks were polished with five combinations of 45, 25, and 10 μm diamonds; a 30-fluted carbide; three silicon carbide-impregnated rubber points; 4 and 1 μm diamond gels; and an aluminum oxide point and two aluminum oxide pastes. Five profilometer average roughness measurements (Ra) were taken of five replications of each step in each sequence. Controls were autoglazed Ceramco II and Dicor MGC ceramic specimens milled with a Cerec diamond wheel. Feldspathic porcelain could be polished smoother than glazed. Dicor ceramic could be polished smoother than Ceramco II ceramic. Finishing diamond points followed by diamond gels produced the smoothest surface. A 30-fluted carbide did not improve smoothness as used. The aluminum oxide point followed by aluminum oxide pastes was equivalent to finishing diamonds and gels for Dicor ceramic.

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 Supported by a Tylman Research Award from the American Academy of Fixed Prosthodontics.

PII: 0022-3913(94)90027-2

Journal of Prosthetic Dentistry
Volume 71, Issue 2 , Pages 174-177, February 1994

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