Dental Acrylic
How acrylic resin is used in dentures and dental appliances.
Dental acrylic, primarily polymethyl methacrylate (PMMA), is the most widely used material for denture bases, temporary restorations, and orthodontic appliances. It is available in heat-cured, cold-cured (self-curing), and light-cured forms, each suited for different applications. Heat-cured PMMA provides the strongest and most stable results for denture fabrication. PMMA offers several advantages including good aesthetics (available in various gum-colored shades), ease of processing and repair, lightweight comfort, and cost-effectiveness. Modern formulations include high-impact acrylic reinforced with rubber particles or fibers for increased fracture resistance, which is particularly important for denture wearers. Limitations of dental acrylic include porosity (which can harbor bacteria and cause odor), polymerization shrinkage, potential for allergic reactions to residual monomer, and susceptibility to fracture under excessive stress. CAD/CAM-milled PMMA blocks offer improved density and reduced porosity compared to traditionally processed acrylic. Proper denture hygiene, including daily cleaning and overnight soaking, is essential for maintaining acrylic restorations.