Question 61 · LDEK · Prosthodontic materials
Which properties do not characterize zirconia-based ceramic?
1) the highest flexural strength index of dental ceramics;
2) the highest hardness of dental ceramics;
3) can be etched with hydrogen fluoride (HF) acid to increase its adhesive properties;
4) has porous structure, which facilitates manufacturing of all-ceramic crowns and bridges;
5) is opaque, white, and can be colorized.
The correct answer is:
2) the highest hardness of dental ceramics;
3) can be etched with hydrogen fluoride (HF) acid to increase its adhesive properties;
4) has porous structure, which facilitates manufacturing of all-ceramic crowns and bridges;
5) is opaque, white, and can be colorized.
The correct answer is:
- A. 1,2.
- B. 2,3.
- C. 3,4.
- D. 4,5.
- E. 1,5.
Hint
Zirconia is polycrystalline with no glass phase; think about what that means for hydrofluoric acid etching and for porosity.
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