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- Title
Expansion of contaminated amalgams assessed by photoelastic resin.
- Authors
Osborne, John W.
- Abstract
Objective: Eight amalgam alloys, 6 high-copper and 2 low-copper, were assessed for expansion via photoelastic resin. Method and materials: The photoelastic resin sheet was sectioned into 20 x 25-mm blocks, and two 4 x 8-mm holes were drilled into the resin The amalgam alloys were hand condensed into the prepared holes. Test conditions for each alloy were (1) uncontaminated, (2) contaminated with 5 ijL of Ringer's solution, and (3) contaminated with 5 ¡jL of cell culture medium. Results: Contaminated high- copper amalgam alloys may exhibit expansion to varying degrees but do not show the classic delayed expansion. One spherical, nonzinc high-copper alloy showed no expansion, whether it was uncontaminated or contaminated, and 3 high-copper alloys with different amounts of zinc (0% to 1%) showed slight expansion when contaminated. One low-copper alloy displayed delayed expansion; within 17 days after initial expansion in the pholoelastic resin, it had exceeded the greatest stress observed in any contaminated, high- copper zinc-containing alloy at 3 months. Conclusion: Contamination of dental amalgam is to be avoided, but a zinc-containing high-copper amalgam will not exhibit classic delayed expansion even if contaminated. (Quintessence Int 1999:30:673-631)
- Subjects
DENTAL amalgams; DENTAL resins; PHOTOELASTICITY; DENTAL metallurgy; CELL culture; COPPER alloys; ZINC alloys
- Publication
Quintessence International, 1999, Vol 30, Issue 10, p673
- ISSN
0033-6572
- Publication type
Article