Comparison of Denture Base Material Processed by the Traditional and a Two-cycle Method
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Date
2018-05
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The Ohio State University
Abstract
Poly(methyl methacrylate) PMMA is the preferred polymer to fabricate denture base materials. However, the current processing conditions results in unpolymerized methyl methacrylate in the final denture base. This can result in lower mechanical and physical properties and lead to biocompatibility issues. Changing the processing method will change the properties of the denture base materials. Recently, the traditional processing method has been improved. The commonly used processing technique is a one cycle heat-curing: the PMMA resin is heated gradually to 75oC and remains at that temperature for 9 hours. In the new method, after initial heating, the denture base is cooled down to room temperature followed by an additional processing step at a temperature of 120oC and at a pressurized water bath. The degree to which the novel two-cycle method would change the properties of the denture base material remains unknown. The object of this study is to compare the physical properties of materials processed by two methods and assess the effectiveness of the two-cycle method. In this study, the control group is processed by the conventional one-cycle method and the experimental group was processed using the two-cycle method. The hardness, color stability, solubility in water and flexural strength were measured. It is shown that the two-cycle processed denture base is harder and less soluble than the one-cycle processed denture base. This suggests that denture base materials with improved mechanical properties can be manufactured via the two-cycle method. Between the two groups, there was no statistically significant difference for either color stability or flexural strength. The overall result suggests that we can improve some properties of denture base material by using two-cycle method, which is environmentally friendly and low-cost.
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processing technique, hardness, flexural strength, color stability, solubility, denture base material