Elastomers for Final Impressions

Polysulfide
› Odor (sulfur)
› Pour same day
› Final Denture Impressions
› Custom Tray
 Uniform thickness
› 2 paste
 Dispensed in = lengths
› Hydrophobic
› Setting time: 8-14 mins
› Stains
› Cheaper

Polyether
› More hydrophilic
› Setting time: 4-6 mins
› May be poured
repeatedly for up to 1
week

Condensation Silicone
›High dimensional instability
› Ethyl alcohol evaporation

Polyvinyl siloxane (Addition Silicone)
› C&B
› Smallest dimensional change
› High elastic recovery
› May be poured several times
› Dimensionally stable for 1 week
› Setting time: 2-6 mins

Forms:

› Light-bodied
syringe type or wash type
Flow
teeth
› Regular, Heavy –Bodied, or Putty
thicker
tray

Elastomeric impression materials offer superior accuracy in capturing fine details of oral structures due to their high elastic recovery, minimal dimensional change, and ability to reproduce intricate surface details