Question 235 · LDEK · Amalgam
Indicate the true information concerning amalgam restorations:
1) increased copper content results in an increased resistance to corrosion;
2) decreased copper content results in an increased resistance to corrosion;
3) mercury-tin phase is the most corrosive phase in amalgam;
4) silver-mercury phase is the most corrosive phase in amalgam;
5) copper-tin phase is the most corrosive phase in amalgam.
The correct answer is:
2) decreased copper content results in an increased resistance to corrosion;
3) mercury-tin phase is the most corrosive phase in amalgam;
4) silver-mercury phase is the most corrosive phase in amalgam;
5) copper-tin phase is the most corrosive phase in amalgam.
The correct answer is:
- A. 1,3.
- B. 1,4.
- C. 1,5.
- D. 2,3.
- E. 2,5.
Hint
Recall which phase disappears in high-copper amalgams and why that improves their durability.
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