Temporary Materials
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4 examples of temporary materials
• PMMA - polymethylmethacrylate e.g. jet • PEMA - polyethylmethacrylate e.g. trim II • Bis-acryl composite e.g. protemp 4, quicktemp • UDMA - urethanedimethacrylate e.g. provipont DC
how is PMMA formed
free addition polymerisation of methacrylate monomer via cross linking due to C=C
advantages of PMMA
powder / liquid formulation self curing good marginal fit good transverse strength polishable
disadvantages of PMMA
poor abrasion resistance high shrinkage high thermal release free monomer may be toxic
key properties to consider with temporary materials
• temperature - exothermic reaction / material encapsulates tooth prep / safety / dentist’s concern • colour stability - aesthetics / anterior teeth / patient’s concern
how is the pulp affect by materials
affected by temperature rise from exothermic reaction as well as duration of this