Violation
In comparing polysulfide, polyether and addition cured silicone impression materials, which of the following statements is true?
After one week, addition cured silicones will undergo more distortion than polysulfides
All three of the materials contract slightly during curing
All the materials expand slightly upon cooling from mouth temperature (37 degrees C) to room temperature (20 degrees C).
Lead oxide is used as an activator in silicones