Curing contraction of addition-type silicone impression materials.
The curing contraction of addition-type silicone impression materials was measured by the mercury bath method. The results point to a classification of this group of materials into the following two types: 1: materials with maximum 0.08% polymerization contraction at 22 degrees C 15 min after mixing and maximum 0.03% contraction at 22 degrees C during storage from 15 min to 24 h (Permagum, President, Reflect and Reprosil). 2: materials with more than 0.08% polymerization contraction at 22 degrees C 15 min after mixing and significantly more than 0.03% contraction during storage at 22 degrees C from 15 min to 24 h (Exaflex, Xantogum).
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003760:Dental Impression Materials; D008628:Mercury; D012826:Silicone Elastomers; D013499:Surface Properties; D013997:Time Factors
D003760:Dental Impression Materials; D012826:Silicone Elastomers; D008628:Mercury