Theme 5

Impression materials and impressions classification. Steps of impression making using different impression materials. Requirements to impressions. Troubleshooting. Requirements to impression materials

1. Which types of impression techniques do you know?

1. *One stage single mix

2. *One stage double mix

3. *Two stage double mix

4. Two stage single mix

2. Which of the following impression materials are double mixed?

1. *Silicone

2. Reversible hydrocolloids

3. Zinc oxide-eugenol

4. Irreversible hydrocolloids

5. Polyethers

3. Gypsum impression withdrawal starts from:

1. *separating tray from impression

2. distal areas

3. anterior areas

4. simultaneous

5. nothing mentioned above

4. In order to get gypsum impression from the mouth doctor should:

1. *brake it

2. pull it

3. there is no difference

4. wet it

5. do nothing

5. Impressions taken by elastic materials should be:

1. *pulled

2. broken

3. there is no difference

4. wet

5. done nothing

6. Functional impression allows NOT to get results:

1. *accurate reflection of teeth and interdental spaces

2. determination of optimal relation of denture borders to oral tissues

3. differential distribution of masticatory load under future denture

4. compression of mucosa

5. nothing above

7. Technique of anatomic impression taking DOES NOT consist of:

1. *forming of impression borders by movements of cheeks, lips, tongue

2. choice of tray

3. impression material preparation

4. tray filled with material insertion

5. tray withdrawal

8. Impression is done properly if it is NOT required to the following:

1. *fuzzy reflection of oral structures

2. no contours of interdental spaces

3. no pores

4. All pieces of gypsum are present

5. Clear reflection of palate and frenum

9. Patient 60 year-old, came with a purpose of prosthetics. Objectively: partially edentulous upper jaw, 42, 41, 31, 33 teeth have 1-2 level of mobility. The patient is indicated to manufacture partial removable denture for the lower jaw. Which impression material is better to use?

1. *Stomalgin (alginates)

2. Stens (impression compounds)

3. Gypsum (plaster)

4. Sielast (silicone-C)

5. Ortokor (impression compounds)

10. Patient, 53 year-old, is manufactured partial removable denture for the upper jaw. Objectively: only 23 is present. 23 is covered by full metal crown, has 1 level of mobility. Impression from the upper jaw will be taken by elastic impression material. Which impression tray should be chosen?

1. *perforated stock tray

2. wax custom tray

3. stock tray without perforations

4. individual stock tray

5. hard custom tray

11. Which group of impression material does “Dentaflex” belong?

1. *silicones

2. plaster

3. impression compounds

4. polyethers

5. alginates

12. Types of impression trays (mark 2 answers):

1. *stock

2. *custom (individual)

3. diagnostic

4. personal

5. working

13. Types of casts (mark 3 answers):

1. *auxiliary

2. *working

3. *diagnostic

4. stock

5. personal

14. Types of impressions that do NOT exist:

1. *stock

2. working

3. diagnostic

4. functional

5. auxilliary

15. Which group of impression material does gypsum belong?

1. *plaster

2. impression compound

3. polyether

4. silicone

5. alginate

16. Which group of impression material does Ypeen belong?

    1. *alginates

    2. plaster

    3. impression compounds

    4. polyethers

    5. silicones

17. Which group of impression material does Stens belong?

1. *impression compounds

2. plaster

3. polyethers

4. silicones

5. alginates

18. Which of the following impression materials has the greatest setting time?

1. *Polysulphides

2. Reversible hydrocolloids

3. C-Silicones

4. Polyethers

5. A-silicones

18. Which of the following impression materials is radiolucent?

1. *Polysulphides

2. Reversible hydrocolloids

3. C-Silicones

4. Polyethers

5. A-silicones

20. What is the distance from impression tray border to teeth (in mm)?

1. *3-5

2. 1-2

3. 6-8

4. 9-11