The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?
Correct answer: A. 3:1
- A. 3:1
- B. 4:1
- C. 10:1
- D. 5:1
Explanation
A powder-to-liquid ratio of about 3:1 by volume gives the acrylic resin a workable dough suitable for packing. Excess monomer from a lower ratio increases shrinkage and residual monomer, while too much powder prevents proper wetting.
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