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