When selection the colour of cement to use for cementing a porcelain jacket crown, the powder being tested is best mixed with______________?
Correct answer: A. Glycerin-water solution
- A. Glycerin-water solution
- B. Cement liquid
- C. Alcohol
- D. Only water
Explanation
For shade selection, the cement powder is mixed with a glycerin-water medium because it approximates the optical effect of the cement without the setting reaction of the actual liquid. Mixing with cement liquid would start setting and can distort the trial shade.
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