Question 24 (part 2) · LDEK · Dental laboratory technology
Indicate true statements regarding casting technique during fabrication of complex crowns on metal coping:
1) pouring the cast from class IV plaster;
2) replication of cast with refractory die;
3) preparation of the abutment in the cast;
4) isolation by covering the abutment with varnish;
5) modeling the wax crown on plaster cast;
6) modeling the crown on replicated cast;
7) mounting the wax templates together with casting canals on the top of soldering cone;
8) sinking the cast together with wax crown in refractory die in soldering ring with casting canals and the soldering cone;
9) changing the wax to metal using the shuttering wax method; 10) fabricating the metal coping.
Correct answer is:
2) replication of cast with refractory die;
3) preparation of the abutment in the cast;
4) isolation by covering the abutment with varnish;
5) modeling the wax crown on plaster cast;
6) modeling the crown on replicated cast;
7) mounting the wax templates together with casting canals on the top of soldering cone;
8) sinking the cast together with wax crown in refractory die in soldering ring with casting canals and the soldering cone;
9) changing the wax to metal using the shuttering wax method; 10) fabricating the metal coping.
Correct answer is:
- A. 1,2,3,4,6,7,8,9.
- B. 1,2,3,6,8,9,10.
- C. 1,3,4,5,7,8,10.
- D. 1,3,4,5,9,10.
- E. 2,3,4,5,6,8,9,10.
Hint
Crown frameworks are waxed on a stone die and only the wax pattern is invested; refractory duplicate models belong to cast partial dentures.
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