Question 157 · LDEK · Prosthodontic materials
Which of the following are essential for achieving a good connection between dental ceramic and dental alloys?
1) accurate polishing of the metal coping;
2) creating microretentive cavities on the surface of the dental alloy (mechanical connection);
3) creating the oxide layer on the alloy surface (chemical connection);
4) difference between shrinkage of dental alloy and ceramic;
5) providing thick ceramic layer.
The correct answer is:
2) creating microretentive cavities on the surface of the dental alloy (mechanical connection);
3) creating the oxide layer on the alloy surface (chemical connection);
4) difference between shrinkage of dental alloy and ceramic;
5) providing thick ceramic layer.
The correct answer is:
- A. 1,2,3.
- B. 2,3,4.
- C. 3,4,5.
- D. 1,3,4.
- E. 1,4,5.
Hint
Think about how the metal surface is treated before opaque application and what happens to stresses in the porcelain as the crown cools.
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