Aging of certain polymers and ways of increasing their deformation resistance
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1. Aging of the material of artificial dentures was investigated at room temperature, with immersion of the specimens in artificial saliva, and also in a medium under a load up to 50 kgf/cm2.
2. It was shown that natural aging of the material in air and with its immersion into a liquid simulating saliva has practically no effect on the deformation properties of the material.
3. When the material is kept under a constant compressive load simulating jaw pressure, its deformational properties change.
4. The addition of 10% PDI-4A to PMMA more than doubles the deformation resistance of the material.
KeywordsPolymer PMMA Compressive Load Natural Aging Property Change
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