Question 281 (part 2) · LDEK · Prosthodontic materials
Indicate true statements regarding preparation of restorations made out of zircon oxide:
- A. preparation of restorations made out of zircon oxide are made with fine-grained burs air-cooled, due to the risk of overheating the material.
- B. use of coarse-grained burns causes scratches and accelerates the transformation of pyramidal to monoclinic phase.
- C. overheating causes the consolidation of height and linear changes of ceramics crystals.
- D. use of coarse-grained burns restricts the overheating effect and protects against the chipping of veneering ceramics.
- E. we minimalize the pressure and reduce the amount of water in order to avoid the fracturing of zircon structure.
Hint
Think about which surface damage triggers the stress-induced phase transformation in zirconia and how adjustment should be cooled.
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