Definitive Cast and Dies Flashcards
A replica of the tooth surfaces, residual ridge areas, and/or other parts of the dental arch and/or facial structures used to fabricate a dental restoration or prosthesis.
Definitive (Master or Working) Cast:
Positive reproduction of the individual prepared tooth; used for wax pattern fabrication.
Die:
Advantages of the \_\_\_\_\_\_\_ CAST: •Guide to occlusal surfaces and contours •Ease of articulation •Development of optimum occlusion •(Development of optimum pontic adaptation and esthetics)
FULL ARCH Cast
Type ___ and Type _____ ADA type of gypsum pdts: impression plaster / model and mounting plaster
Type I and II
Type _____ ADA type of gypsum pdts: dental stone (general purpose casts)
Type III
Type _____ ADA type of gypsum pdts
high strength / lowest expansion (die stone)
Type IV:
Type _____ ADA type of gypsum pdts
high strength / high expansion (die stone)
Type V:
Do you add water to powder or powder to water for gypsum products?
Powder to water
- Helps eliminate porosity
- Strengthens the cast
- 20 seconds / 425 rpm / >25mmHg
Mechanical-Vacuum Mixing of Gypsum
•Over-spatulation→ ____ working time
decreased
In a two pour cast pourup, should you invert the impression/cast?
No: leave in upright position
Linear dimension ↓ per every ____ minutes of immersion
20 minutes
Does surface hardness = abrasion resistance?
No
•Retained by pins in a base (stone or plastic)•One die used for entire wax pattern -proximal contacts, occlusion and margins
Removable Dies
(Multiple Pour System)•Single (separate) die for wax coping and margins•Solid cast for waxing proximal contacts and occlusion
Solid Cast / Separate Dies
