Question 3 · LDEK · Root canal obturation
Which answer sets the ingredients of gutta percha cones in the descending order of their content?
1) gutta-percha;
2) radiopacifiers;
3) zinc oxide;
4) plasticizers.
The correct answer is:
2) radiopacifiers;
3) zinc oxide;
4) plasticizers.
The correct answer is:
- A. 1,2,3,4.
- B. 1,3,4,2.
- C. 2,4,3,1.
- D. 3,1,2,4.
- E. 3,1,4,2.
Hint
A so-called gutta-percha cone is mostly inorganic filler; the polymer itself is only about one fifth of its mass.
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