Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture?
(A) Excessive expansion (B) Low impact strength (C) Excessive shrinkage (D) Excessive brittleness
(C) Curing shrinkage arises as the monomer is converted to polymer and the free space it occupies reduces (approximately 20% less than that among unreacted monomers).
Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 293