Effect of water temperature on the fit of provisional crown margins during polymerization: An in vitro study
| Autor: | Arunachalam Sangeetha, V. Ramkumar, Vinaya Kumar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Materials science
medicine.medical_treatment Composite number lcsh:Analytical chemistry lcsh:RS1-441 Dentistry Bioengineering water temperature during polymerization General Biochemistry Genetics and Molecular Biology Crown (dentistry) lcsh:Pharmacy and materia medica Brass Stereo microscope medicine provisional crown margin General Pharmacology Toxicology and Pharmaceutics Composite material Shrinkage lcsh:QD71-142 business.industry Bis-acrylic composite resin Polyvinyl siloxane Tray Polymerization visual_art Dental Science - Original Article visual_art.visual_art_medium business |
| Zdroj: | Journal of Pharmacy & Bioallied Sciences Journal of Pharmacy and Bioallied Sciences, Vol 4, Iss 6, Pp 376-383 (2012) |
| ISSN: | 0975-7406 0976-4879 |
| Popis: | Aim: To evaluate the effect of water temperature on the marginal fit of bis-acrylic composite provisional crown during resin polymerization. Materials and Methods: Precisely machined 10 brass master dies were designed to simulate molar teeth. Five brass dies were selected and precisely machined to simulate all ceramic crown preparation. An acrylic jaw replica was made in which brass dies were arranged equidistant from each other. A custom-made metallic tray was fabricated on the acrylic jaw replica to make polyvinyl siloxane impression matrix. Bis-acrylic composite resin provisional crowns were made using polyvinyl siloxane impression matrix. Provisional crowns were polymerized at room temperature (Group I direct technique, on dental stone cast; Group I indirect technique crowns) and at different water temperatures (Group II direct technique crowns). The vertical marginal gap between all the provisional crown margins and the finish line of brass dies was measured using a Research Stereomicroscope System. Results: The results were statistically analyzed using one-way analysis of variance (ANOVA) test and Newman-Keul′s test. The results showed that crowns polymerized in 20°C and 30°C water had marginal gap approximately three times smaller than those polymerized in 30°C air, due to the reduced polymerization shrinkage. Conclusion: This study shows that crowns polymerized in 20°C and 30°C water had mean vertical marginal gap approximately three times smaller than those polymerized in 30°C air. It was approximately closer to that of crowns fabricated by indirect technique. Warmer water also supposedly hastens polymerization. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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