Question 126 (part 2) · LDEK · Amalgam
Choose true statements regarding cavity restoration with amalgam:
1) in order to restore the cavity, proper angles need to be secured: surface-cavity amalgam should not exceed 110o (90-110o), and marginal should not be lower than 50o (50-100o);
2) in occluso-proximal restoration angle between the floor and cavity wall should be rounded or obliqued;
3) minimal thickness of small extent amalgam on occlusal surface should be 2mm, with 2.5 to 3mm diameter, in case of extensive restoration – correspondingly more;
4) procedure of edges smoothing is performed only in case of cavities restored with amalgam;
5) zinc oxide eugenol cements may be used as single primer for amalgam restorations.
Correct answer is:
2) in occluso-proximal restoration angle between the floor and cavity wall should be rounded or obliqued;
3) minimal thickness of small extent amalgam on occlusal surface should be 2mm, with 2.5 to 3mm diameter, in case of extensive restoration – correspondingly more;
4) procedure of edges smoothing is performed only in case of cavities restored with amalgam;
5) zinc oxide eugenol cements may be used as single primer for amalgam restorations.
Correct answer is:
- A. 1,2,5.
- B. 2,4,5.
- C. 3,4,5.
- D. 2,3,4.
- E. 1,3,5.
Hint
Keep in mind that amalgam is brittle in thin sections, which angles concentrate stress, and which base materials are incompatible with which fillings.
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