All of the following statements about Type II silicon impression material are true EXCEPT_______________?
Correct answer: D. They set by condensation polymerisation
- A. They evolve hydrogen when cast if they are not fully cured
- B. They exhibit a very low setting shrinkage
- C. They have a lower tear resistance than polysulphide rubbers
- D. They set by condensation polymerisation
Explanation
Type II silicone is addition-cured silicone and sets by addition polymerisation, not condensation polymerisation. It has low shrinkage, relatively lower tear resistance than polysulfide, and may release hydrogen if incompletely cured.
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