Theme 15. Indications and steps of swaged-soldered bridges.

1. Annealing of alloys is produced for:

A) *change of metal structure and properties

B) change of metal color

C) protection from oxidization D) prevention of metal shrinkage E) removal of oxide

2. While polishing the soldered prosthesis dark spots (borax remains) were exposed. How to remove them? A) *with emery paper

B) process with miller C) grind with carborundum bur

D) bleach again E) polish for a long time

3. What type of wax is preferable for modeling of bridge intermediate part? A) *wax «Lavax» B) base wax C) wax for clasps

D) wax for bridges

E) sticky wax

4. What feature of pontic design will decrease load on abutment teeth? A) *narrowed occlusal surface

B) smoothed out occlusal surface

C) hollow intermediate part D) occlusal surface facing by acrylic

E) with support on gum

5. Prosthetics with bridge appliances consists of such clinical steps, except:

A) *making models

B) preparing teeth and making impressions

C) try-in crowns and determining of central occlusion

D) evaluation of prosthetic appliance

E) fixing bridge

6. Name the laboratory stages of bridge manufacture, except:

À) *determination of central occlusion

B) pouring the gypsum models

C) wax pattern the bridge body

D) swaging the abutment crowns

E) process of bridge body

7. A solder alloy must have such properties, except:

A) *the structure of solder must highly correlate with the structure of metal

B) be liquid and moist properly the metal surface

C) contain minimum magnitude of carbon

D) must not undergo the corrosion

E) the color of solder must not differ from the color of base metal

8. Patient is being planned to restore dental arches with a help of swaged-soldered bridge with abutments on 48, 46, 38 and 36. What chewing efficiency will be reached (in percent) with the help of this denture?

А.*100%

В. 30%

С. 60%

D. 40%

Е. 80%

9. Patient is being planned a bridge denture with support on 27, 24. Endurance of periodontium is twice less than normal. Which teeth are reasonable to use as abutments in this case?

А. *23, 24 and 27

В. 24 and 27

С. 24, 27 and 28

D. 23, 24 and 27, 28

Е. 22, 23, 24, and 27

10. Patient is being planned prosthetics with swaged-soldered bridge with 17, 14 abutment teeth. The type of chewing load transfer in bridge dentures is –

1. *Physiological

2. Semi physiological

3. Nonphysiological

4. Measured

11. Firstly, bridge details before soldering are:

A) *cleaned out of oxide

B) covered by petrolatum

C) invested in gypsum

D) annealed

E) processed by sulphuric acid

12. The main parts of bridge denture are –

1. *Abutments and body

2. Framework and pontic

3. Abutments and base

4. Telescopic crowns and body

5. Framework

13. A purpose of flux using is:

A) *reduce oxides

B) to do soldering more strong

C) acceleration of soldering

D) creation of fluidity of flux

E) preliminary soldering

14. The patient is being made swaged-soldered bridge of Cr18Ni10T. During soldering crown and body composition of solder used is on the basis of:

A. Silver *

B. Gold.

C. Lead

D. Tin

E. Zinc

15. The patient is being made swaged-soldered bridge with abutment teeth 46, 44. What is the main purpose of the abutment teeth preparation?

* A. parallelism

B. ledge in the direction of the defect

C. ledge off the defect

D. parallelism with the adjacent tooth

E. Perpendicular to antagonists

16. The patient is being made swaged-soldered bridge with abutment teeth 47, 45. While manufacture of what bridge abutment crowns are fitted separately from pontic?

* A swaged-soldered

B. Cast

C. Adhesive

D. Any type

E. Metal-ceramic

17. The patient is being made swaged-soldered bridge with abutment teeth 17, 14, 13 teeth. When is wax pattern of the body performed?

A. *After fitting crowns

B. Prior to modeling of crowns

C. While modeling the abutment crowns

D. After bleaching the crowns

E. After polishing the crowns

18. The patient is being made swaged-soldered bridge with abutment teeth 47, 44, 45. A doctor tried crowns and took impression. What is the next technical step?

* A. impression pouring

B. mounting casts into articulator

C. waxing the intermediate part

D. Polishing crowns

E. Bleaching crowns

19. The patient is being made swaged-soldered bridge with abutment teeth 13, 22 with facings on 12, 11, 21. What stage the waxing of facings is held on at?

A. *After soldering the body and the crowns

B. Prior to soldering the body and the crowns

C. Prior to bleaching

D. After polishing

E. It does not matter

20. The patient is being made swaged-soldered gold bridge denture. At the stage of crowns fitting the occlusal impression is taken with gypsum. What percentage of NaCl is used while mixing plaster?

* A. 3%

B. 1%

C. 5%

D. 2%

E. 7%

21. The patient is being made swaged-soldered bridge of alloy containing 900 part gold. As solder for this alloy is used 750 part gold. Which component is added into the solder to reduce the melting point?

A. Cadmium *

B. Lead

C. Tin

D. Silver

E. Copper

22. The patient is being made swaged-soldered bridge. (CaSO4) 2 * H2O is used at both clinical and laboratory steps. What kind of material is it?

A. Gypsum *

B. Cement

C. Bleacher

D. Powered quartz

E. Quartz

23. The patient is being made swaged-soldered bridge. What is the next step after crowns fitting?

A. *taking impression

B. fixation

C. try-in

D. waxing the intermediate part

E. additional teeth preparation

24. The patient is being made swaged-soldered bridge with abutments 13, 23 teeth. What step is not considered as clinical?

A denture polishing *

B. preparation of the teeth

C. taking occlusal impression

D. try-in bridge denture

E. fitting crowns

25. The patient is being made swaged-soldered bridge. After teeth preparation which impression material it is reasonable to use for the impression:

A. * Tropikalgin

B. Ortokor

S. Protakril

D. Panasil

E. Repin