Study of the physical properties of type IV gypsum, resin-containing, and epoxy die materials
| Autor: | B. Keith Moore, Philip Duke, Carl J. Andres, Steven P. Haug |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Gypsum business.product_category Chemical Phenomena Surface Properties Materials testing engineering.material Calcium Sulfate Stress (mechanics) Dental Materials Hardness Materials Testing Humans Composite material Shrinkage Analysis of Variance Chemistry Physical Epoxy Resins Epoxy Models Dental Resins Synthetic visual_art visual_art.visual_art_medium engineering Dental Casting Investment Die (manufacturing) Stress Mechanical Oral Surgery business |
| Zdroj: | The Journal of prosthetic dentistry. 83(4) |
| ISSN: | 0022-3913 |
| Popis: | Statement of problem: Little published information is available comparing the properties of recently developed resin-modified gypsum and epoxy resin die materials, which are claimed to be superior to conventional type IV gypsum die materials. Purpose: This study compared the properties of 3 new die materials and 2 conventional type IV gypsum products. Methods and material: The linear dimensional change, detail reproduction, surface hardness, abrasion resistance, and transverse strength of 2 recently introduced, resin-modified gypsum die materials (Resinrock and Milestone), a new epoxy resin die material (Epoxy-Die), and 2 conventional type IV gypsum die materials (Silky-Rock and Die-Stone) were studied. Results: All gypsum products expanded, whereas the epoxy resin material contracted during setting. The epoxy resin exhibited much better detail reproduction, abrasion resistance, and transverse strength than the gypsum materials, which were similar in these properties. A conventional type IV gypsum exhibited the highest surface hardness, whereas the epoxy resin had the lowest value. Conclusion: The resin-modified gypsum products were not significantly superior to the conventional type IV gypsum die materials. In general, the epoxy resin exhibited the best properties of the materials studied; however, its setting shrinkage may necessitate alterations in technique to achieve well-adapted castings. (J Prosthet Dent 2000;83:466-73.) |
| Databáze: | OpenAIRE |
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