Question 133 (part 2) · LDEK · Impressions and impression materials
Indicate the features of polyether chemical-curing impression material:
1) hydrogen is a by-product of binding;
2) it exhibits strong hydrophilic properties;
3) lack of smell and taste;
4) the impression should be cast as quickly as possible after taking it;
5) during binding, increase in temperature occurs by 4.2oC;
6) the material exhibits a double-snap effect;
7) transparent trays are necessary for taking an impression;
8) it is used for example for functional impressions in edentulous maxilla and mandible;
9) binding reaction is accompanied by temperature increase of 1oC; 10) water is a by-product of binding, which influences the volumetric changes in the impression; 11) it is used for isolation of the teeth from the plaster during the flasking process; 12) it is characterized by high rigidity after binding.
Correct answer is:
2) it exhibits strong hydrophilic properties;
3) lack of smell and taste;
4) the impression should be cast as quickly as possible after taking it;
5) during binding, increase in temperature occurs by 4.2oC;
6) the material exhibits a double-snap effect;
7) transparent trays are necessary for taking an impression;
8) it is used for example for functional impressions in edentulous maxilla and mandible;
9) binding reaction is accompanied by temperature increase of 1oC; 10) water is a by-product of binding, which influences the volumetric changes in the impression; 11) it is used for isolation of the teeth from the plaster during the flasking process; 12) it is characterized by high rigidity after binding.
Correct answer is:
- A. 2,5,8,12.
- B. 1,2,3,6,11.
- C. 3,4,7,9,10,12.
- D. 1,3,5,6,8,11,12.
- E. 2,4,6,8,9,10,11,12.
Hint
Polyether is known for wettability and stiffness; eliminate statements that describe by-products of addition silicones or polysulfides.
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