Theme 6. Technology of cast, metal-ceramic and metal-composite crowns manufacture. Properties of main and auxiliary materials which are used for their manufacture.

1.Which alloys are used for metal-ceramic frameworks?

A. *Gold, cobalt-chromium, nickel-chromium, titanium

B. Gold, cobalt-chromium, titanium, titanium-nickel

C. Gold, nickel-chromium, cobalt-nickel

D. Gold, stainless steal, cobalt-chromium

E. Gold, silver, titanium, silver-nickel

2.Main metals of cobalt-chromium alloy are:

A. *Titanium, cobalt, chromium, nickel

B. Cobalt, chromium, sulfur, manganese

C. Silicon, cobalt, chromium

D. Cobalt, chromium

E. Cobalt, chromium, molybdenum

3.What from the following is appropriate for metal frame of metal-ceramic crown? (mark two answers)

A. *CoChr

B. *Silver-Palladium Alloy

C. Chromium-nickel steel

D. Zircon

E. Cobalt

4.Male patient, 30 year-old, complains about discoloration of 13 tooth. Dental history: tooth was treated owing to caries, allergic to acrylic resin. Objectively: 13 has dark grey color, filling, X-ray – root canal is filled up to apex, direct bite. Which crown is indicated to patient?

A. *Metal-ceramic

B. Cast

C. Metal-acrylic

D. Acrylic

E. Swaged

5.Which instruments are used for shoulder preparation for metal-ceramic and metal-acrylic? (mark three answers)

A. *Carbide stone

B. Separative disk

C. Round-end tapered bur

D. Torpedo diamond bur

E. Enamel hatchet

6.Which instruments are used for tooth preparation for metal-ceramic and metal-acrylic? (mark two answers)

A. *Shaped heads

B. Carbide and diamond burs

C. Millers

D. Enamel hatchet

E. Vulcanite disk

7.Which methods of periodontium trauma prevention are possible to use while teeth preparation? (mark three answers)

A. *Use rotary instruments with big heads

B. To prepare tooth along its gingival finish line

C. Insert thin packing cord before preparation

D. Use blunt burs

E. Use hemostatic solutions

8.While tooth preparation such complications are possible except:

A. *Fracture of tooth crown

B. Injury of neighboring teeth

C. Overheat of pulp

D. Marginal periodontium trauma

E. Soft tissues trauma (tongue, cheeks)

9.What can be used for soft tissues trauma prevention? (mark three answers)

A. *Use svedopter

B. *Use handpiece with water cooling

C. *Good condition of rotary cutting instruments

D. Use tranquilizers

E. Use anxiolytics

10.Male patient 25 year-old complains about tooth defect in frontal region in the left side. Objectively: 23 tooth endodontically treated. Filling on the vestibule-proximal surface takes 1/3 part of tooth, good margin setting, stable, doesn’t match the color of tooth. Tooth is discolorated, percussion is painless. Which construction is more appropriate for this patient?

A. *Metal swaged crown

B. Acrylic crown

C. Metal-ceramic crown

D. ½ crown

E. Inlay

11.Female patient 24 year old complains about 21 tooth defect. Objectively: incisal edge of 21 tooth is ruined on 1/3, discolored, radiologocally root canal filled up to apex. It was planned to fabricate metal-acrylic crown. Where the marginal finish line should be positioned?

A. *At gingiva level

B. 1,0 mm supragingival

C. 0,5 mm supragingival

D. 0,5 mm subgingival

E. 1,0 mm subgingival

12.Male patient 27 year old needs dental prosthetics. Objectively: teeth are intact, stable. Orthognatic bite. Metal-acrylic crowns are planned to be fabricated. Which acrylic resin can be used for facing?

A. *Sinma-M

B. Acryloxide

C. Noracryl

D. Protacryl

E. Ftorax

13.Metal-ceramic crowns are fabricated for a female patient, 28 year old. Fitting of framework is conducted. What technology is used for the porcelain addition?

A. *Forming

B. Casting

C. Firing

D. Soldering

E. Swaging

14.Tooth preparation is performed for a metal-ceramic crown. Choose the most appropriate impression material for the working impression fabricating?

A. *Silicone

B. Alginate

C. Compound

D. Zinc oxide eugenol

E. Polysulfide

15.Tooth preparation is performed for a metal-ceramic crown. Choose the most appropriate impression material for the additional impression fabricating?

A. *Alginate

B. Polyether

C. C-silicone

D. A-silicone

E. Zinc oxide eugenol

16.What is the ideal taper of preparation for metal-ceramic or metal-acrylic crown?

A. *6-7 º

B. 2-3º

C. 4-5 º

D. 8-9 º

E. 10-11 º

17.What is the thickness of occlusal reduction for cast metal crown?

A. *1,0-1,5 mm

B. 0,3-0,5 mm

C. 0,5-1,0 mm

D. 1,5-2,0 mm

E. 2,0-2,5 mm

18.What is the taper of tooth preparation?

A. *Reverted inclination one tooth wall

B. Inclination of one tooth wall

C. Inclination of two opposite walls

D. Inclination of two adjacent walls

E. Reverted inclination of two opposite walls

19.What is the thickness of occlusal reduction for metal-ceramic crown?

A. *1,5-2,0 mm

B. 0,3-0,5 mm

C. 0,5-1,0 mm

D. 1,0-1,5 mm

E. 2,0-2,5 mm

20.Male patient, 43 year old, complains about excessive tooth wear. Objectively: decreasing of occlusal vertical dimension, lateral teeth need to be restored by crowns. Which crowns are indicated this patient?

A. *Cast

B. Swaged

C. Full ceramic

D. Acrylic

E. Metal-ceramic

Theme 7. Indications, requirements for bridge dentures. Classification of dental arches defects by Betelman. Clinical and laboratory steps of making. Properties of main and auxiliary materials which are used for bridge manufacture.

1. Female patient, 54 year-old, complains about absence of side teeth. Objectively: 48 47 46 35 36 37 are absent. Determine the class of edentulous dental arch by Kennedy classification.

A. *Class I

B. Class II

C. Class III

D. Class IV

E. Class V

2. Female patient, 38 year-old. Teeth formula:

18 17 16 15 14 13 12 11 21 22 23 24 25 26 27 28

48 0 0 0 44 43 42 41 31 32 33 34 35 36 37 38

Which class of dental arches defects by Kennedy is it?

A. *III

B. I

C. II

D. IV

E. V

3. Male patient, 24 year-old. Teeth formula:

18 17 16 15 14 13 0 0 0 0 0 24 25 26 27 28

48 47 46 45 44 43 42 41 31 32 33 34 35 36 37 38

Which class of dental arches defects by Kennedy is it?

A. *IV

B. I

C. II

D. III

E. V

4. Male patient, 56 year-old, complains about absence of lower teeth on left and right sides. Objectively: 48, 47, 46, 45, 35, 36, 37, 38 teeth are absent. Diagnosis will be written as:

A. *Dental arch defect II class by Kennedy

B. Dental arch defect III class by Kennedy

C. Dental arch defect IV class by Kennedy

D. Dental arch defect I class by Kennedy

E. Dental arch defect III class by Betelman

5. Metal part of ceramic bridge is named:

À) *framework B) intermediate part C) facing

D) body E) shoulder

6. While prosthetics with swaged-soldered prosthesis there are following clinical procedures:

Impression taking(1)

Crown fitting (2)

Teeth preparation (3)

Prosthesis fixation (4)

Central occlusion identifying (5)

What is the correct sequence of such procedures?

А. *3,1,2,5,4.

B. 3,1,5,2,4.

C. 1,5,3,2,4.

D. 1,2,3,4,5.

E. 1,3,4,5,2.

7. There are such clinical steps of bridge denture manufacture EXCEPT:(mark two answers)

A. *Models pouring

B. *Mounting of models into occluder

C. Teeth preparation and impression taking

D. Crowns fitting and central occlusion identifying

E. Bridge fixation

8. Fluxes can be such substances (mark two answers):

A. *Sodium borax

B. *Borax

C. Orthophosphoric acid

D. Magnalium

E. Tin

9. Bridge denture can have such abutments EXCEPT:

A. *Retaining clasps

B. Pivot teeth

C. Bearing-retaining clasps

D. Crowns

E. Equator crowns

10. Bridge denture is fabricated for replacing of 26, 25 missing teeth. Which type of pontic should be chosen for this patient?

A. *Hygienic

B. Saddle

C. Bearing

D. Modified ridge lap

E. Conic

11. What are the methods of bridge prosthetic appliances making? A. *casting B. *swaged-soldering

C. forging

D. soldering E. swaging

12. While cast bridge with facings there are such laboratory procedures:

Pontics modeling (1)

Crowns modeling (2)

Processing and preparing of metal (3)

Modeling of facing (4)

Replacement wax with metal (5)

Choose the correct order of these procedures:

А. *2,1,5,3,4.

B. 2,1,4,5,3.

C. 1,2,4,5,3.

D.1,2,3,4,5.

E. 3,2,1,4,5.

13. Bleaching of steel details is carried out by:

A) *mixture of hydrochloride and nitric acids with water

B) 40-50% solution of hydrochloride acid C) 96% alcohol

D) mixture of hydrochloride, nitric and sulphuric acids with water E) hydrogen peroxide

14.Bleaching of metal dental appliances is used for:

A. *Oxide layer elimination

B. Preparing for polishing

C. Increasing of anticorrosional properties

D. Enhancing of esthetics

E. Pores elimination

15.Anticorrosional properties of stainless steel are provided by:

A. *Chromium

B. Nickel

C. Silicon

D. Titanium

E. All above

16.To avoid pulp burn during preparation it is necessary to follow such rules EXCEPT:

À) *To use a dry instrument on the dry surface of tooth

B) Keep to the areas of tooth safety

C) Interrupted preparation

D) Preparation with cooling

E) To use sterile, sharp instruments

17.The number of abutments of bridge denture should be increased in such cases EXCEPT:

A. *People who are older than 50

B. After apex resection

C. Short crowns

D. Alveolar septum resorption

E. Tooth mobility of 1 rate

18. Patient of 53 years is being made swaged-soldered bridge. At clinics and laboratory is used additional material with chemical formula (СаSO4)2 х Н2О. What material is it?

A.*Gypsum

B.Cement

C. Wax

D. Isokol

E. Bleacher

19.Patient is being made swaged-soldered bridge denture. Models were poured and set in an occluder. What is the following step?

A. *Crowns fitting in oral cavity

B. Pontics modeling

C. Impression making

D. Soldering

E. Bleaching

20. Cast bridge denture is fabricated for a patient. Casts pouring was performed and their attachment to occluder. What is the following step?

A. *Wax modeling

B. Impression taking

C. Central occlusion determination

D. Casting

E. Denture fitting