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Acrylic Resins (Indication (denture bases (soft override, tissue…
Acrylic Resins
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Classification and composition
polymer: the higher molecule weight, the greater degree of polymerization
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2 type of acrylic resins
From acrylic acid (ethylene, contain vinyl group)
--> transparent, hard, absorb water
From methacrylic acid (methyl methacrylic monomer)
--> transparent, liquid, odor
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Handling
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- sticky with filamentous forms
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- in hot water bater to decompose initiator
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- monomer disappear (porosity)
rubbery, losing all plasticity
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when mixing, should cover by container (monomer evaporation > toxicity)
Properties
Physical
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relatively low specific weight
- lightness of denture, attach upper denture
- radiolucent: difficult to see
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Chemical
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not enough polymerization: monomer (toxic)
--> allergy and irritation
--> allergic patient use cure system without methyl methacrylate monomer
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m.o colonization on resin surface: stomatitis by prosthesis, candidiasis
--> CHX and Nystatin gluconate treatment
Type
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Cold curing resins: chemical activator
for repair acrylic denture, relining, provisional crown