Determination of doughing and manipulation times of acrylic resin denture base material and a proposal for a specification for a packing plasticity test
| Autor: | G. Mutlu, R. Huggett, A. Harrison |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Denture Bases
Time Factors Materials science Rheometer Methylmethacrylate Plasticity law.invention Microcomputers Polymethacrylic Acids law Materials Testing Methylmethacrylates Composite material General Dentistry Acrylic resin chemistry.chemical_classification Viscosity Polymer Reference Standards Penetrometer chemistry visual_art visual_art.visual_art_medium Methacrylates Denture base Fixed frequency Rheology Flow properties |
| Zdroj: | Journal of Dentistry. 20:311-317 |
| ISSN: | 0300-5712 |
| DOI: | 10.1016/0300-5712(92)90057-j |
| Popis: | The doughing and manipulation times of a range of acrylic resin denture base polymers are presented in this study. The methods evaluated were: (i) probing following American Society for testing materials specification, F451-76; (ii) hole penetration following British Standard, 2487: 1989 and International Standard Organisation, 1567: 1988; (iii) probing using a penetrometer employing a 20 g load and 1 mm diameter needle; (iv) oscillating rheometer apparatus used at a fixed frequency of 1 Hz by sweeping through a programmed linear increase in strain. The results indicate that each of the methods is capable of evaluating the doughing and manipulation times of the unprocessed polymers. It is concluded that the Bohlin VOR Oscillating Rheometer is excellent for investigating the flow properties of denture base polymers but it cannot be recommended for a standards specification test because of the high cost. The penetrometer method has been shown to be superior to the current standards specification test and would be ideal for a packing plasticity standards test. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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