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Questions in this quiz (50)
1lastic materials that set into the canal are as following:
- AA. Epoxy resin –based hermetic pastes
B. Zinc oxide-eugenol based pastes
D. Zinc oxyphosphate cements - BC. Long-lasting antiseptic
E. Biologically active pastes
- AA. Epoxy resin –based hermetic pastes
2The irrigation solutions are good for:
- AA. They loosen the debris within the canal , thus contributing to their mechanical removal
B. Increase the number of pathogenic germs within the endodontic space
C. Decrease the number of pathogenic germs within the endodontic space
D. Make the debris removal useless within the canal
E. Produce a chemical action on the debris within the canal - BC. Decrease the number of pathogenic germs within the endodontic space
A. They loosen the debris within the canal , thus contributing to their mechanical removal
- AA. They loosen the debris within the canal , thus contributing to their mechanical removal
3The following conditions must be followed in order to get an optimal metal-ceramic bond
- AA. The metal surface should be glossy
B. The metal surface should be rough
C. To provide saturation of one bonding component through the elements of the other component
D. The metal surface should provide macro-retention
E. An oxide surface layer should be present on the metal when burning the first layer of ceramic mass - BB. The metal surface should be rough
C. To provide saturation of one bonding component through the elements of the other component
E. An oxide surface layer should be present on the metal when burning the first layer of ceramic mass
- AA. The metal surface should be glossy
4Compomers are indicated in the following cases:
- AA. In insulating fillings under composite restorations
B. Gingival wall restoration of Class II cavity
C. Restoration of cuneiform defects
D. When the aesthetic appearance does not matter
E. In fillings that are subjected to considerable masticatory activity (A,B,C) - BA. In insulating fillings under composite restorations
B. Gingival wall restoration of Class II cavity
C. Restoration of cuneiform defects
- AA. In insulating fillings under composite restorations
5Acrylic resin artificial teeth:
- AA. Are supplied in sets
B. Are performed under dental laboratory conditions
C. Are industrially manufactured
D. Provide poor bonding with the base of the prosthesis - BA. Are supplied in sets
B. Are performed under dental laboratory conditions
C. Are industrially manufacture
E. Provide good bonding with the base of the prosthesis
- AA. Are supplied in sets
6To preserve the metal surfaces, the following are used:
- AA. Methyl polymethacrylate
B. Ormocers
C. Quartz D. Corund E. Ceromers - BA. Methyl polymethacrylate
C. Quartz D. Corund
C. Quartz D. Corund
- AA. Methyl polymethacrylate
7Volume changes of the packing mass involves:
- AA. Thermal shrinkage.
B. Setting shrinkage
C. Thermal expansion
D. Setting expansion
E. Hydroscopic expansion - BA. Thermal shrinkage.
C. Thermal expansion
D. Setting expansion
E. Hydroscopic expansion
- AA. Thermal shrinkage.
8Plastobtur material (non eugenol paste) has the following properties:
- AA. Good strength, high resistance to mechanical agents
B. Wide range of color shades
C. A relatively low adhesion to cavity walls - BC. A relatively low adhesion to cavity walls
D. Medium strength
E. Poor heat conductor
- AA. Good strength, high resistance to mechanical agents
9Dentin-paste exhibits the following properties
- AA. Simple use
B. Good cavity sealant
C. Antiseptic action
D. Poor adhesion to dentine walls
E. Harmful action to the pulp, it interacts with other drugs - BA. Simple use
B. Good cavity sealant
- AA. Simple use
10The packing masses should meet the following requirements
- AA. Small-sized powder particles
B. Should be porous
C. Large powder particles
D. To have an expansion coefficient as small as possible E. To have a shrinkage coefficient as low as possible - BA. Small-sized powder particles
B. Should be porous
- AA. Small-sized powder particles
11Gypsum setting time:
- AA. Increases along with the water amount
B. Decreases along with the water amount
C. Decreases along with reduced particle size D. Depends on the time of spatulation
E. Increases along with reduced particle size - BA. Increases along with the water amount
C. Decreases along with reduced particle size D. Depends on the time of spatulation
- AA. Increases along with the water amount
12.The ormocers have the following properties:
- AA. High resistance
B. Biocompatibility
C. Low polymerization stability
D. Low resistance to abrasion
E. Low amount of residual monomers after polymerization - BA. High resistance
B. Biocompatibility
E. Low amount of residual monomers after polymerization
- AA. High resistance
13Metal ionomer cements are indicated in the following cases:
- AA. Wide sealing
B. Reconstructions of dental bridges
C. Retrograde filling of root canals in case of root apex resection - BC. Retrograde filling of root canals in case of root apex resection
D. Medium strength
E. Poor heat conductor
- AA. Wide sealing
14Glass ionomer cement has the following properties:
- AA. Cariostatic effect due to a fluorine slow discharge and apatite layer formation B. Antibacterial properties
C. Reduced biocompatibility
D. High compressive strength
E. Low compressive strength - BA. Cariostatic effect due to a fluorine slow discharge and apatite layer formation B. Antibacterial properties
D. High compressive strength
- AA. Cariostatic effect due to a fluorine slow discharge and apatite layer formation B. Antibacterial properties
15Calcium hydroxide has the following properties
- AA. It stimulates reparative dentin formation
B. Low biological compatibility
C. It coagulates necrotized tissues
D. Low alkalinity
E. High biological compatibility (A,C,E) - BA. It stimulates reparative dentin formation
C. It coagulates necrotized tissue
E. High biological compatibilitys
- AA. It stimulates reparative dentin formation
16Which of the following statements regarding the material requirements in production of models are true
- AA. Should not present volumetric changes
B. Should be resistant to abrasion
C. The material shows greater plasticity as it is more fluid D. The material shows lower plasticity as it is more fluid
E. Should be chemically stabl - BA. Should not present volumetric changes
B. Should be resistant to abrasion
C. The material shows greater plasticity as it is more fluid
E. Should be chemically stable
- AA. Should not present volumetric changes
17Simple acrylic resins have the following properties
- AA. Therapeutic action on the dental pulp
B. Harmful action on the dental pulp
C. Good adhesion to enamel and dentine
D. They are not impaired by mouth fluids and saliva
E. They are susceptible to mouth fluids and saliva - BB. Harmful action on the dental pulp
D. They are not impaired by mouth fluids and saliva
- AA. Therapeutic action on the dental pulp
18he following statements and methods regarding color selection are true
- AA. the central incisor has the highest saturation of the dominant hue, corresponding to natural teeth color
B. Color saturation is determined by the reflected light of a body
C. Color selection is a visual method based on objective opinion - BD. The canines have the highest saturation of the dominant hue corresponding to the natural teeth
E. The technical methods for color selection are carried out via the spectrometer
- AA. the central incisor has the highest saturation of the dominant hue, corresponding to natural teeth color
19The wax properties are as following
- AA. Thermal expansion: it expands as the temperature rises and contracts on cooling
B. Thermal stability: it does not show changes during heating and cooling
C. Deformation: waxes have low thermal conductivity, contributing to uneven heating, resulting in shrinkage and deformations inside the material
D. Does not have residual pressure
E. Does not deform on heating - BA. Thermal expansion: it expands as the temperature rises and contracts on cooling
C. Deformation: waxes have low thermal conductivity, contributing to uneven heating, resulting in shrinkage and deformations inside the material
- AA. Thermal expansion: it expands as the temperature rises and contracts on cooling
20The properties of self-curing acrylic resins are
- AA. Volumetric changes: thermal expansion, then polymerization shrinkage, and finally, thermal shrinkage
B. Volumetric stability: the acrylic resins exhibit no volume changes
C. Optical features: poor chromatic stability
D. Optical features: a wide range of color shades
E. Corrosion: the resin, that is initially translucent, gets opaque and yellowish, followed by fissures over time, thus resulting in a decrease of the mechanical resistance - BA. Volumetric changes: thermal expansion, then polymerization shrinkage, and finally, thermal shrinkage
C. Optical features: poor chromatic stability
E. Corrosion: the resin, that is initially translucent, gets opaque and yellowish, followed by fissures over time, thus resulting in a decrease of the mechanical resistance
- AA. Volumetric changes: thermal expansion, then polymerization shrinkage, and finally, thermal shrinkage
21Indications for the sulphate-based packing masses are as following
- AA. Mould manufacturing of acrylic prosthesis
B. Mould manufacturing of metal prostheses made of gold-based alloys
C. Mould manufacturing of ceramic restorations
D. Aligning and fixing metal prosthetic parts in a certain position, which should be bonded
E. Mould manufacturing of metal prostheses made of non-noble alloys - BA. Mould manufacturing of acrylic prosthesis
B. Mould manufacturing of metal prostheses made of gold-based alloys
D. Aligning and fixing metal prosthetic parts in a certain position, which should be bonded
- AA. Mould manufacturing of acrylic prosthesis
22Depending on the binder agent type, the packing masses are classified into
- AA. Nitrate packing masses
B. Phosphate-based packing masses
C. Carbonate packing masses
D. Silicate-based packing masses E. Sulphate-based packing masses - BB. Phosphate-based packing masses
D. Silicate-based packing masses E. Sulphate-based packing masses
- AA. Nitrate packing masses
23The impression materials should meet the following requirements:
- AA. Plasticity
B. Reliability
C. Low price
D. Dimensional stability
E. Elasticity and mechanical strength - BA. Plasticity
B. Reliability
D. Dimensional stability
E. Elasticity and mechanical strength (A,B,D,E)
- AA. Plasticity
24The following dental materials may cause allergic reactions:
- AA. Ceramic masses
B. Methyl methacrylate
C. Ni-Cr-based alloys
D. Titanium alloys
E. Some impression materials - BB. Methyl methacrylate
C. Ni-Cr-based alloys
E. Some impression materials (B,C,E)
- AA. Ceramic masses
25.The iodoform paste is indicated in
- AA. Dental treatment with no apical abscess B. Filling of temporary infected canals
C. Deep cavities
D. Incompletely filled canals
E. Wide, rectilinear young tooth canals - BD. Incompletely filled canals
- AA. Dental treatment with no apical abscess B. Filling of temporary infected canals
26The characteristics of resin-based endothermics:
- AA. They are unstable in the canal and sensitive to moisture
B. They are radiolucent
C. They are sensitive to temperature, so they are not used with hot gutta-percha D. They are toxic to periodontal tissue
E. They are heat-resistant, thus allowing being used with hot gutta-percha - BE. They are heat-resistant, thus allowing being used with hot gutta-percha
- AA. They are unstable in the canal and sensitive to moisture
27The property of calcium hydroxide is as following
- AA. It increases apical secretion
B. It hardens the necrotic tissue
C. It prevents cementogenesis
D. Bactericidal effect
E. High thermal conductivity - BD. Bactericidal effect
- AA. It increases apical secretion
28The characteristic of composite resins initiated by UV radiation is
- AA. Limited color range
B. Opacity
C. Transparency
D. Short time of modeling
E. Susceptibility to micro-fissure - BC. Transparency
- AA. Limited color range
29The main feature of composite resins initiated by incoherent visible radiation (halogen) is as following
- AA. Wide range of color shades
B. Constant color of the filling over time
C. Uniform polymerization of the entire material layer after mixing equivalent amounts of paste
D. Non-uniform polymerization
E. Various degree of translucency - BC. Uniform polymerization of the entire material layer after mixing equivalent amounts of paste
- AA. Wide range of color shades
30Eucapercha results from
- AA. Gutta-percha solubility at heat in warm chlorhexidine B. Gutta-percha solubility at heat in clove oil
C. Hot solubility of gutta-percha in eucalyptus oil
D. Gutta-percha homogenization with thymol
E. Gutta-percha homogenization with iodoform - BC. Hot solubility of gutta-percha in eucalyptus oil
- AA. Gutta-percha solubility at heat in warm chlorhexidine B. Gutta-percha solubility at heat in clove oil
31Camphorquinone initiates the photopolymerization reaction, which dissociates due to the 400-500nm light wavelength for:
- AA. 5-10 sec
B. 20-40 sec
C. 60-90 sec
D. 90-120 sec
E. The action time does not matter - BD. 90-120 sec
- AA. 5-10 sec
32The gutta-percha cones are:
- AA. Plastic materials that set into the canal
B. Plastic material that do not set into the canal
C. Hard material
D. Semi-hard materials
E. Materials that set only when exposed to UV rays - B(C)Hard material
- AA. Plastic materials that set into the canal
33Long-lasting antiseptic Iodoform paste is as follows
- AA. Plastic paste that sets into the canal
B. Plastic paste that does not set into canal
C. Solid material
D. Material used in canal irrigation
E. Long-lasting material used in restoration of crown defects - BD. Material used in canal irrigation
- AA. Plastic paste that sets into the canal
34Which of the following statements regarding root filling materials is true:
- AA. Root filling materials should have timely resorbtion capacity
B. Root filling materials hardly should be removed from the canal
C. Root filling materials should dissolve in saliva
D. Root filling materials should not change the volume over time
E. Root filling materials should have a fast setting time - BD. Root filling materials should not change the volume over tim
- AA. Root filling materials should have timely resorbtion capacity
35Positive patterns of resin-based endohermetics
- AA. They are steady in the canal and moisture-resistant
B. They are radiotranslucent
C. They are inert to periodontal tissues
D. They are temperature-sensitive, thus are not used with hot gutta-percha
E. Good handling properties (can easily be inserted into the canal - BA. They are steady in the canal and moisture-resistant
C. They are inert to periodontal tissues
E. Good handling properties (can easily be inserted into the canal)
- AA. They are steady in the canal and moisture-resistant
36The requirements for root sealing materials are as following
- AA. Long-lasting setting time
B. Antibacterial action
C. They must be biologically incompatible with the periapical tissues D. They should not stain dental tissue
E. They should be radiotranslucent - BA. Long-lasting setting time
B. Antibacterial action
D. They should not stain dental tissue
- AA. Long-lasting setting time
37The requirements for root sealing materials are as following:
- AA. The materials should be easily prepared (mixed) and easily inserted into the canal
B. The materials should totally harden, so that they cannot be removed from the canal
C. The materials should seal tightly the root canal
D. The materials should provide timely resorption from root canals
E. The materials should be resistant to microorganisms - BA. The materials should be easily prepared (mixed) and easily inserted into the canal
C. The materials should seal tightly the root canal
D. The materials should provide timely resorption from root canal
E. The materials should be resistant to microorganisms (A,C,E)
- AA. The materials should be easily prepared (mixed) and easily inserted into the canal
38.Calcium hydroxide has the following properties
- AA. Decomposes necrotic tissue
B. Eliminates apical abscess
C. Increases apical abscess
D. Hardens the necrotic tissue
E. Stimulates bone, dentin and cementum formation - BA. Decomposes necrotic tissue B. Eliminates apical abscess
E. Stimulates bone, dentin and cementum formation
- AA. Decomposes necrotic tissue
39.Root filling is the final phase of endodontic treatment, aiming to
- AA. Seal tightly the root canals along their entire length and width B. Prevent apical periodontitis
C. Block the bacterial germs within the dentinal canaliculi
D. Prevent periapical osteitis scarring
E. Provide healing of the apical abutment - BA. Seal tightly the root canals along their entire length and width
B. Prevent apical periodontitis
E. Provide healing of the apical abutment
- AA. Seal tightly the root canals along their entire length and width B. Prevent apical periodontitis
40The disadvantages of composite resins with incoherent visible-light initiation are as following:
- AA. Too long time for modeling
B. Too little time for modeling
C. Limited color range
D. Light discoloration of filling over time E. Dark discoloration of filling over time - BB. Too little time for modeling
C. Limited color range
E. Dark discoloration of filling over time (B,C,E)
- AA. Too long time for modeling
41Composition of GYSI’s triopaste with paraformaldehyde
- AA. Tricresol
B. Creolin
C. Paraformaldehyde D. Calcium hydroxide E. Zinc oxide - BA. Tricresol
B. Creolin
C. Paraformaldehyde
E. Zinc oxide
(A,B,C,E)
- AA. Tricresol
42GYSI's Triopaste with paraformaldehyde is used in the following cases
- AA. Root filling after devital removal with partial catheterization
B. Treatment of teeth with apical abscess
C. Mummification in case of devital amputation
D. Filling of the temporary -infected canals
E. Accidental exposure of the pulp chamber in young teeth - BA. Root filling after devital removal with partial catheterization
C. Mummification in case of devital amputation
- AA. Root filling after devital removal with partial catheterization
43The iodoform paste is indicated in:
- AA. Treatment of teeth with apical abscess
B. Filling of temporary-impaired tooth canals
C. Deep cavities
D. Incomplete filling of canals
E. Rectilinear, wide young canals (A,B) - BA. Treatment of teeth with apical abscess
B. Filling of temporary-impaired tooth canals
- AA. Treatment of teeth with apical abscess
44The properties of iodoform paste are as following :
- AA. Strong long-lasting antiseptic effect
B. Short-term antiseptic effect
C. Increased resorption
D. If it exceeds the apex, it might be irritating, resulting in a medical abscess E. If it exceeds the apex, it does not affect the adjacent tissues - BA. Strong long-lasting antiseptic effect
C. Increased resorption
D. If it exceeds the apex, it might be irritating, resulting in a medical abscess
- AA. Strong long-lasting antiseptic effect
45The iodoform paste is obtained by mixing:
- AA. Iodoform
B. Zinc oxide
C. Eucalyptus oil
D. Thymol
E. A few drops of Walkhoff solution - BE. A few drops of Walkhoff solution
- AA. Iodoform
46The purpose of glassionomer cements is as following:
- AA. It provides a constant sealing between the root canal wall and the gutta-percha B. It prevents the microbial spread
C. In case of microbial presence within the root canal, it does not prevent their spread D. It prevents inflammation of the periapical tissues
E. It leads to inflammation of the periapical tissues - BA. It provides a constant sealing between the root canal wall and the gutta-percha
B. It prevents the microbial spread
D. It prevents inflammation of the periapical tissues
- AA. It provides a constant sealing between the root canal wall and the gutta-percha B. It prevents the microbial spread
47The glass ionomer cement, used as a sealing material, has the following properties
- AA. High adhesion to dentine
B. Poor adhesion to dentine
C. Good tolerance of the apical periodontium
D. Toxic effect on the apical periodontium
E. Waterproof sealing - BA. High adhesion to dentine
C. Good tolerance of the apical periodontium
E. Waterproof sealing
- AA. High adhesion to dentine
48Chloropercha is prepared by dissolving gutta-percha cones in Chloroform, to which the following is added:
- AA. Eucalyptus oil
B. Thymol
C. Iodoform
D. Garlic oil
E. Oxygenated water - BB. Thymol
C. Iodoform
- AA. Eucalyptus oil
49Gutta-percha has the following characteristics
- AA. It is a thermoplastic
B. Loosens at 100C
C. Melts at 100 C
D. It can be sterilized at high temperature E. It can’t be sterilized at heating - BA. It is a thermoplastic
C. Melts at 100 C
- AA. It is a thermoplastic
50Chelating agents or 10% citric acid are used for the purpose of:
- AA. Removing the organic wastes from the canal
B. Maintaining the organic tissues intact - BA. Removing the organic wastes from the canal
B. Maintaining the organic tissues intact
C. Intact removal of organic tissues
D. Maintaining the organic debris intact within the canal
E. Achieving a foaming effect, thus contributing to bacterial removal from the root canal
- AA. Removing the organic wastes from the canal
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- Quiz on last 50, created by sumia ad on 21/06/2022.
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