Self-Curing Acrylic Resins: Composition, Strength, and Limitations

Self-Curing

Write a short note on self-cure acrylic resin.
Answer:

It is also known as chemically activated denture base acrylic resin or cold cure or autopolymerizing resin.

Composition  Of self-cure acrylic resin:

Liquid:

• Methyl methacrylate monomer −  Dissolves/plasticizes
• Dimethyl-p-toluidine −  Activator
• Dibutyl phthalate −  Plasticizes polymer
• Glycol methacrylate (1–2%)  −  Cross-linking agent
• Hydroquinone − (0.006%) Inhibitor

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Powder

• Poly (methyl methacrylate) other co-polymers — 5% −  Dissolved by and monomer to form a dough
• Benzoyl peroxide −  Initiator
• Compounds of mercuric sulfide, cadmium sulfide − Dyes
• Zinc or titanium oxide −  Opacifirs
• Dibutyl phthalate  −  Plasticizer
• Dyed organic filers and inorganic particles like glass fibers or beads − For esthetics

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Properties Of self-cure acrylic resin:

• Its flexural strength is low.
• It has low compressive strength, i.e. 65 MPa, and low tensile strength, i.e. 60 MPa.
• Its surface hardness is 16 to 18 KHN.
• It exhibits lower dimensional changes.
• Its water sorption is 0.5 to 0.7 mg/cm2
• It has a higher solubility rate, i.e. 0.05 mg/cm2
• It has poor color stability so esthetics are compromised.
• Yellowing of material occurs.

Uses Of self-cure acrylic resin:

• For making temporary crowns and FPDs.
• For denture repair, relining, and rebates.
• For making removable orthodontic appliances.
• For the construction of special trays.
• For fabrication of temporary and permanent denture bases.
• For fabricating inlay and post-core patterns.

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Advantages Of self-cure acrylic resin:

• The initial fi is good.
• Helps in repairing dentures and does not lead to warpage.
• It is easy to manipulate.
• It exhibits less shrinkage.
• Its dimensional accuracy is high.

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Disadvantages Of self-cure acrylic resin:

• Color stability is inferior
• Properties are inferior compared to heat-cure acrylic resin.
• Polymerization is incomplete.
• Its flxural strength is low.
• Residual monomer leads to tissue irritation.