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