题目内容

Which statement is correct regarding the degree of polymerization of methyl methacrylate in denture base acrylic resin()

A. no residual monomer exists after processing a heat activated acrylic resin at 165℃ for 8 hours
B. more residual monomer exists in a denture that is processed by chemical activation than by heat activation
C. residual monomer in a denture can only be eliminated by raising the temperature to 212℃ for 1 hour after processing．
D. excessive brittleness

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