Question 195 · LDEK · Model analysis
Indicate correct sentences regarding the type 3 plaster:
1) also called model plaster, whose special variant is orthodontic plaster;
2) also called cast plaster, whose special variant is orthodontic plaster;
3) it is characterized by high porosity and low precision;
4) it is characterized by low porosity and high precision;
5) it is highly susceptible to abrasion and characterized by low stability of size.
The correct answer is:
2) also called cast plaster, whose special variant is orthodontic plaster;
3) it is characterized by high porosity and low precision;
4) it is characterized by low porosity and high precision;
5) it is highly susceptible to abrasion and characterized by low stability of size.
The correct answer is:
- A. 1, 3, 5.
- B. 2, 3, 5.
- C. 2, 4, 5.
- D. 2, 4.
- E. 1, 4.
Hint
Type 3 gypsum is the hard stone used for diagnostic models; recall its porosity, accuracy and durability.
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