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1. Connection of acrylic with metal in combined swaged crown is carried out by:
A. *Balls (perl)
B. Formation of oxide layer
C. Chemical bonding
D. Diffusion of materials
E. Lining of cap
2. What are the indications for combined crown fabricating?
A. *Restoration of frontal teeth
B. Short crown
C. Deep bite
D. Adolescents
E. Crown defects of upper premolars and molars
3. Clinical procedures of Belkin’s combined crown making, except:
A. *Fitting of metal swaged crown in the oral cavity, polishing
B. Preparation of tooth. Taking of working and auxiliary impressions
C. Fitting of metal swaged crown, additional preparation of tooth on 1.0-1.5 mm
D. Orifice is made in crown, filled with softened wax and put on a tooth
E. Fitting of artificial crown in the oral cavity, cementation
4. Patient is being made crown by Borodyuk. What from the following are constructive elements of this crown: 1 swaged cap, 2 ceramic facing, 3 protective plate, 4 metal shackle, 5 “window”
A. *1,3,4
B. 1,2,5
C. 1,3,5
D. 1,4,5
E. 1,2,4
5. While taking impressions for metal-ceramic crowns manufacture such impression material is commonly used:
A. *Silicone
B. alginate
C. Impression compound
D. Zinc oxide eugenol
E. Impression plaster
6. The features of Borodyuk’s crown are:
À.* with a peak and facing
B. with root pivot and core
C. with a window and facing
D. cast and facing
E. system of double crowns
7. Disadvantages of Belkin’s combined crown are the followings except:
A. *matches to the color of natural teeth
B. acrylic swells
C. developing of gingivitis
D. grinding of thick layer of hard dental tissues
Å. the acrylic decolorizes by the time
8. Female patient, 30 year-old, came with complaints about discoloration of 13 tooth, cosmetic defect. From dental history the tooth was treated due to the complicated caries, allergy on acrylics. Intraoral exam: 13 tooth of dark-grey color; the defect of crown is restored with filling. On X-ray the root canal is sealed up to the apex. What crown is indicated to this patient?
À) *cast;
B) acrylic;
C) metal-acrylic;
D) ceramic;
E) swaged.
9. Features of tooth preparation for combined crown by Belkin:
A) *additional preparation of vestibular surface on 1-1.5 mm;
B) additional preparation of vestibular and oral surfaces on 1-1.5 mm;
C) a tooth is prepared as for the complete metal swaged crown;
D) additional preparation of vestibular, aproximal and oral surfaces on 1-1.5 mm;
E) additional preparation of vestibular, aproximal surfaces and cutting edge, on a vestibular surface create a shoulder (chamfer).
10. Patient R.is planned to substitute central upper incisors by metal-ceramic crowns. Preparation of teeth is carried out with forming subgingival shoulder. What impression material is necessary to use for working impression?
À) *silicone
B) impression plaster
C) impression compound
D) alginate
E) zinc-oxide eugenol.
11. Patient, 33 year old, came with the purpose of prosthetics. The chosen construction is a metal-ceramic crown. What impression material is indicated?
À) *«Stomaflex»;
B) «Stomalgin»;
C) gypsum;
D) «Stens»;
E) «Ortokor»;
12. Patient, 35 year old, is being made full metal swaged crown for a 37 tooth. Examination data: caries cavity on the masticatory surface. What doctor should do with this cavity?
A. *Preparation and filling
B. Widening of cavity
C. Creating bevel
D. Creating additional shoulder
E. Preparation of cavity
13. A 23 year old woman came to a dental clinic for restoration of the 11th tooth's crown.
Objectively: root of the 11th tooth is at a level with gingival edge, its walls are thick enough.
A dentist made and adjusted a stump inlay upon which a metal-plastic crown will be fixed.
What plastic will be used for veneering?
A *Sinma-M
B Acryloxide
C Carbodent
D Noracryl
E Protacryl
14. A 25-year-old patient complains about a cosmetic defect in the frontal part of his upper jaw on
the left. Objectively: the 23 tooth is pulpless. The filling restores vestibular-approximal surface
of the tooth crown by 1/3, it is stable, closely fits within cavity walls, its colour doesn’t match
the colour of the tooth. The tooth itself has changed its colour, its percussion is painless.
What is the optimal prosthetic construction for this patient?
A *Metal-ceramic crown
B Elastic crown
C Metal swaged crown
D Portion crown
E Inlay
15. Crown by Borodyuk is being made for a patient. Metal cap was fitted. What is the following step?
A. *Making of additional retentive element
B. Wax modeling of facing
C. Vestibular surface preparation
D. Impression taking
E. Crown cementation
16. Choose from the following statements correct sequence of laboratory procedures of Borodyuk’s crown manufacture: 1 protective plate casting, 2 waxing of facing, 3 cap swaging, 4 acrylization, 5 protective plate waxing.
A. *3,5,1,2,4
B. 1,2,4,3,5
C. 4,2,3,5,1
D. 3,2,4,5,1
E. 1,4,5,2,3
17. The patient is being made metal-ceramic crowns. How does mechanical entrapment of metal to ceramic occur?
A. * Interlocking the opaque porcelain with metal surface irregularities
B. Due to the larger thermal expansion coefficient of metal
C. The mutual attraction of the molecules
D. Due to the oxide layer
E. -
18. The patient is being made a combined crown by Belkin. The swaged crown was fitted in the mouth. What is the next step?
A. * Cut hole in the crown
B. Fill the crown with wax
C. Impression making
D. Cementation of crown
E. Waxing of facing
19. The patient is being made metal-ceramic crowns. How does metal chemically bond to ceramic?
A. * Due to the oxide layer
B. Interlocking of opaque porcelain in metal surface irregularities
C. Due to the larger thermal expansion coefficient of metal
D. The mutual attraction of the molecules
E. -
20. The patient is being made a combined crown by Borodyuk. A technician has cast a protective plate. What is the next step?
A. * soldering cap and protective plate
B. waxing of facing
C. creation of an additional element of retention
D. connection of construction with plastic
E. bleaching
21. The patient is being made a combined crown by Belkin. For an aesthetic effect a “window” is cut in the vestibular surface for being covered with acrylic. What does this necessary manipulation cause?
A. * fragility of construction
B. ease of coupling of plastic with crown
C. alleviate the weight of the crown
D. Exact siting of crown on a tooth
E. deterioration of coupling of plastic with a crown
22. The patient is being made a combined crown by Belkin. What are the clinical stages of this crown manufacture: 1. Cementation, 2. Stamped crown adjustments, 3. Impression taking, 4. Tooth preparation, 5.Additional preparation of vestibular surface, 6. Pouring of crown with wax
A. * 4,3,2,5,6,3,1
B. 4,3,2,5,6,1
C. 1,4,3,2,5,3,1
D. 4,5,2,3,6,1
E. 5,4,3,2,6,3,1
23. The patient is being made a combined crown by Belkin. The doctor handed over to the technical laboratory impression with a crown filled with wax. Technician cast the model and molten the wax. What is the next step?
A. * Cut a window on the vestibular surface
B. waxing of facing
C. polymerization of a plastic
D. waxing of a retentive shackle
E. Soldering of the crown with protective plate
24. What is the difference between crown by Kurylenko and Belkin’s crown:
A. * setting of the crown with a hole on the tooth before taking impression
B. additional preparation
C. Cutting of the vestibular surface
D. Modeling of a facing
E. impression taking
25. What is the difference between crown by Pogodin and Belkin’s crown:
A. * Additional preparation
B. The sequence of technical steps
C. impression taking
D. pouring of models
E. Cutting of the vestibular surface
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