# In heat cure denture base acrylic resins, the monomer is:
A. Methyl methacrylate
B. Ethyl methacrylate
C. Methyl ethyl methacrylate
D. Polymethyl methacrylate
The correct answer is A. Methyl methacrylate.
Most polymethyl methacrylate resin systems include powder and liquid components. The powder consists of prepolymerized spheres of polymethyl methacrylate and a small amount of benzoyl peroxide, termed the initiator, which is responsible for starting the polymerization process. The liquid is predominantly nonpolymerized methyl methacrylate monomer with small amounts of hydroquinone. Hydroquinone is added as an inhibitor, which prevents undesirable polymerization or “setting” of the liquid during storage. Inhibitors also retard the curing process and thereby increase working time.
Ref: Phillip’s Science of Dental Materials, 12th Edition, Page no. 475
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