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

Please describe the matter of abuse