Question 2 (part 2) · LDEK · Prosthodontic materials
In order to ensure permanent connection of metal-ceramics alloy, the most advantageous situation occurs when:
- A. during cooling process, the alloy is shrinking slightly more than ceramics.
- B. thermal expansion index of metal coping is higher by 0.5x10-6/0C.
- C. both materials possess similar thermal expansion index values.
- D. ceramics is induced by permanent compressive stress – residual compression.
- E. all of the above-mentioned are true.
Hint
Consider how a small difference in thermal contraction between alloy and porcelain puts the porcelain under a type of stress it tolerates well.
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