Question 82 (part 2) · LDEK · Dental laboratory technology
Choose true statements regarding laboratory actions during fabrication of cast removable denture:
1) casting primary model, parallelometer analysis and designing metal part;
2) filling agar form with refractory die on vibration table;
3) gluing the primary model to the base of the duplication form and placing it in 350 C water bath, followed by sinking with liquid agar;
4) removing the model from agar form, followed by mixing the refractory die;
5) after setting of refractory die, secondary model is released form agar;
6) blocking the undercuts with wax under retentive arms with overabundance below planned clasp. Wax margin is formed with a margin along the gingival clasp margin;
7) blocking the undercuts with wax in all other teeth;
8) submerging the secondary model in stabilizing liquid;
9) drying the secondary model; 10) transfer of cast removable denture drawing from primary to secondary model.
Correct answer is:
2) filling agar form with refractory die on vibration table;
3) gluing the primary model to the base of the duplication form and placing it in 350 C water bath, followed by sinking with liquid agar;
4) removing the model from agar form, followed by mixing the refractory die;
5) after setting of refractory die, secondary model is released form agar;
6) blocking the undercuts with wax under retentive arms with overabundance below planned clasp. Wax margin is formed with a margin along the gingival clasp margin;
7) blocking the undercuts with wax in all other teeth;
8) submerging the secondary model in stabilizing liquid;
9) drying the secondary model; 10) transfer of cast removable denture drawing from primary to secondary model.
Correct answer is:
- A. 1,10,2,3,6,4,5,7,8,9.
- B. 1,6,3,7,4,8,5,9,2,10.
- C. 1,6,7,3,4,2,5,10,9,8.
- D. 1,2,3,4,5,7,6,8,9,10.
- E. 1,3,7,4,6,10,8,9,2,5.
Hint
Undercuts must be blocked out on the master cast before it is duplicated, and the refractory cast can be treated only after it is recovered from agar.
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