When the acrylic powder and liquid are mixed,the chemical- and heat-cured materials go through a similar reaction,except that chemical-cured materials have a _____ in the liquid as an activator,whereas heat-cured materials do not.

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When the acrylic powder and liquid are mixed,the chemical- and heat-cured materials go through a similar reaction,except that chemical-cured materials have a tertiary amine in the liquid as an activator,whereas heat-cured materials do not.The acrylic powder is composed mostly of small beads of PMMA (poly methyl methacrylate)and benzoyl peroxide (the initiator).The liquid contains MMA (methyl methacrylate),hydroquinone as an inhibitor or preservative to prevent polymerization of the MMA during storage,and glycol dimethacrylate as a cross-linking agent.

When the Acrylic Powder and Liquid Are Mixed,the Chemical- and Heat-Cured