Question 314 (part 2) · LDEK · Prosthodontic materials
Indicate true statements regarding acrylic materials:
- A. it is applied to the polymerization form in the rubber phase.
- B. powder in thermosetting materials contains initiator in the amount of 5%, which is most frequently benzoyl peroxide.
- C. addition of butadiene-styrene rubber increases the endurance of material 5-fold.
- D. in order to obtain satisfactory mechanical properties of fast polymers, polymerization process should be carried out under the pressure of 5-6 bars and temperature of 35-400C.
- E. main fault of chemo-cured acrylates is reaching 10% concentration of residual monomers.
Hint
Compare each figure with typical values for packing stage, initiator content, residual monomer and pressure polymerization of self-cure resins.
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