Question 280 (part 2) · LDEK · Prosthodontic materials
Indicate true statements regarding the zircon oxide (IV):
1) it is in the form of blocks used for milling in CAD/CAM technology;
2) it is in the form of two variations: monoclinic, below the temperature of 1170oC and pyramidal, in the temperature range of 1170oC-2370oC;
3) blocks used for milling are stabilized with oxides: yttrium, calcium, magnesium, cerium, chromium;
4) they undergo sinterization, which leads to reduction of intercrystallite space and takes place in the temperature of 1600oC-1700oC;
5) abbreviation 3Y-TZP applies – where 3Y speaks about 3% weight of yttrium oxide contained in ceramics material.
Correct answer is:
2) it is in the form of two variations: monoclinic, below the temperature of 1170oC and pyramidal, in the temperature range of 1170oC-2370oC;
3) blocks used for milling are stabilized with oxides: yttrium, calcium, magnesium, cerium, chromium;
4) they undergo sinterization, which leads to reduction of intercrystallite space and takes place in the temperature of 1600oC-1700oC;
5) abbreviation 3Y-TZP applies – where 3Y speaks about 3% weight of yttrium oxide contained in ceramics material.
Correct answer is:
- A. 1,2.
- B. 2,3.
- C. 3,4.
- D. 1,4.
- E. 1,5.
Hint
Check the number of zirconia phases, which oxides really stabilise it, and whether '3Y' refers to weight or mole percent.
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