The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________?
Correct answer: A. 19
- A. 19
- B. 20
- C. 21
- D. 26
Explanation
ADA Specification No. 19 covers non-aqueous elastomeric dental impression materials, including polysulfides, silicones and polyethers. Specification numbers such as 20 and 21 apply to other dental material categories.
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