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Related Experiment Videos

Surface roughness of polished amalgams.

J L Drummond1, H Jung, E E Savers

  • 1Department of Restorative Dentistry, University of Illinois at Chicago, College of Dentistry 60612.

Operative Dentistry
|July 1, 1992
PubMed
Summary

Surface roughness of high-copper amalgam after dental procedures depends more on the amalgam

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Surface Science

Background:

  • Dental amalgam restorations are widely used.
  • Finishing and polishing are critical steps to ensure restoration longevity and patient comfort.
  • Understanding factors influencing amalgam surface roughness is essential for optimal clinical outcomes.

Purpose of the Study:

  • To evaluate the surface roughness of nine different high-copper dental amalgams.
  • To assess the impact of various finishing and polishing techniques on amalgam surface texture.
  • To determine the influence of time intervals between procedures on surface roughness.

Main Methods:

  • Nine high-copper amalgam materials were tested.
  • Samples were prepared using a standardized mold and hand-condensation.
  • Four finishing/polishing protocols were applied at 1, 3, 6, and 24-hour intervals: carving only, carving then burnishing, carving then polishing, and carving, burnishing, then polishing.

Main Results:

  • Surface roughness varied significantly among the tested high-copper amalgams.
  • Finishing and polishing time did not appear to be the primary determinant of surface roughness.
  • Amalgam particle characteristics (size, shape, distribution) showed a stronger correlation with surface roughness.

Conclusions:

  • The intrinsic properties of high-copper dental amalgams, specifically their particle characteristics, are more influential on surface roughness than the finishing and polishing procedures or timing.
  • Material selection is a key factor in achieving desired surface smoothness in amalgam restorations.

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