Effect of different curing temperatures on the distortion at the posterior peripheral seal: An in vitro study
| Autor: | Aman Arora, R B Hallikerimath, Shilpi Gilra, Nirmala Pasam |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Denture Bases
Time Factors Materials science Surface Properties medicine.medical_treatment Acrylic Resins Dentistry Calcium Sulfate Dental Materials Natural rubber Prosthesis Fitting Materials Testing medicine Humans In vitro study Composite material Denture Design General Dentistry Acrylic resin posterior palatal seal Curing (chemistry) Wax business.industry Denture Complete Upper Temperature Water Distortion General Medicine Models Dental lcsh:RK1-715 visual_art lcsh:Dentistry visual_art.visual_art_medium Denture base Rubber Dentures business processing temperature |
| Zdroj: | Indian Journal of Dental Research, Vol 23, Iss 3, Pp 301-304 (2012) |
| ISSN: | 1998-3603 0970-9290 |
| Popis: | Context: Most of the maxillary complete dentures do not adapt accurately to the cast because of the changes in the resin during polymerization. The amount of heat associated with processing of polymethyl methacrylate has been correlated with the adaptation of the processed denture base to its supporting tissues. Aims: This study conducted to determine the effect of different curing temperatures on the accuracy of fit of a complete maxillary denture and to compare with that of fiber-reinforced acrylic resins. Materials and Methods : An ideal maxillary rubber mould used to make an edentulous cast. Forty-eight stone casts made from the ideal rubber mould. Out of 48 identical stone casts, 44 stone casts with wax adapted processed using simple acrylic resin. The remaining four stone casts were processed using fiber-reinforced acrylic resin. However, processing time for 12 hrs was maintained constant for all the samples. The variable to investigate was the temperature. Therefore, four denture bases processed at each temperature from 60°C to 80°C with two-degree increments for a total of 44 samples using simple acrylic resin. Remaining four samples processed at 70°C using fiber-reinforced acrylic resin. A traveling microscope used to measure the discrepancy between each cast and its denture base. Statistical analysis used: Analyzed with Student's unpaired t test. Results : Minimum distortion was observed at 70°C. Maximum distortion was observed for the denture bases processed at 80°C. Amount of distortion increases as the processing temperature increases which was highly significant. Distortion was significantly high from 60 to 68°C in the decreasing order. Conclusion: This study verified the observation that maxillary complete denture base show the greatest discrepancy at the central portion of the posterior palatal seal region as the processing temperature increases. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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