1 - A material which is a mixture of two different materials and its properties are_____________?
1 - A material which is a mixture of two different materials and its properties are_____________?
Composite
2 - About polymerization shrinkage of composite all are true, except______________?
2 - About polymerization shrinkage of composite all are true, except______________?
Polymerization shrinkage is greater if bonded surface area is lesser than unbounded surface area
3 - Acid-etching is done for_______________?
3 - Acid-etching is done for_______________?
30 seconds
4 - Acrylic (cold cure)______________?
4 - Acrylic (cold cure)______________?
Produces heat during polymerization
5 - Acrylic resins are used for______________?
5 - Acrylic resins are used for______________?
All of the above
6 - Acrylic resins were first introduced as a denture base material in______________?
6 - Acrylic resins were first introduced as a denture base material in______________?
1937
7 - All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?
7 - All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?
The former have greater transverse strength
8 - Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor_____________?
8 - Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor_____________?
Thermal properties
9 - Benzoin methyl ether in a polymer indicates that they may be cured in the presence of________________?
9 - Benzoin methyl ether in a polymer indicates that they may be cured in the presence of________________?
UV light
10 - Boiling point of methyl methacrylate________________?
10 - Boiling point of methyl methacrylate________________?
B.P of water
11 - Bonding of composite resins to tooth structure is by________________?
11 - Bonding of composite resins to tooth structure is by________________?
Mechanical
12 - Co-efficient of thermal expansion is highest for_____________?
12 - Co-efficient of thermal expansion is highest for_____________?
Acrylic resin
13 - Cold cure acrylic expand in water by___________?
13 - Cold cure acrylic expand in water by___________?
1% by volume 0.23% by weight
14 - Composite has_______________?
14 - Composite has_______________?
Resin & Filler
15 - Composite resins in comparison to acrylic have_______________?
15 - Composite resins in comparison to acrylic have_______________?
High abrasive resistance
16 - Cross linking in denture base resin is contributed by_____________?
16 - Cross linking in denture base resin is contributed by_____________?
Glycol dimetharylate
17 - Dentin bonding agents usually contain_____________?
17 - Dentin bonding agents usually contain_____________?
Hydrophobic and hydrophilic component
18 - Dentin conditioner has the following function______________?
18 - Dentin conditioner has the following function______________?
Removes smear layer
19 - Denture acrylics contain cross-linking agents mainly to improve their_____________?
19 - Denture acrylics contain cross-linking agents mainly to improve their_____________?
Craze resistance
20 - During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?
20 - During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?
60°C
21 - Etchant preferred in gel from than in liquid form________________?
21 - Etchant preferred in gel from than in liquid form________________?
Better control over placement
22 - Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
22 - Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
10 um – 20 um
23 - For esthetic areas where high luster is required the restoration used usually______________?
23 - For esthetic areas where high luster is required the restoration used usually______________?
Microfilled resin composites
24 - For photo-curing the composite resin the light source______________?
24 - For photo-curing the composite resin the light source______________?
Should be held at a millimeter distance from the restoration
25 - Hydroquinone is added to methyl methacrylate monomer_________________?
25 - Hydroquinone is added to methyl methacrylate monomer_________________?
To prevent polymerization during storage
26 - If curing occurs at temperature more than 100°C porosity results in which area of denture______________?
26 - If curing occurs at temperature more than 100°C porosity results in which area of denture______________?
Hard thick central area
27 - If resin is packed in sandy stage what will be seen in the processed denture ?
27 - If resin is packed in sandy stage what will be seen in the processed denture ?
Porosity
28 - If resin is packed in sandy stage what will be seen in the processed denture ?
28 - If resin is packed in sandy stage what will be seen in the processed denture ?
Porosity
29 - In heat cure denture base acrylic resins the monomer is___________?
29 - In heat cure denture base acrylic resins the monomer is___________?
Methacrylate
30 - In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?
30 - In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?
In the thickest part
31 - In self-cure acrylic resin, activator is_____________?
31 - In self-cure acrylic resin, activator is_____________?
Tertiary amine
32 - Inadequate pressure application during flasking_______________?
32 - Inadequate pressure application during flasking_______________?
Increases vertical dimension
33 - Inorganic phase of the composites aid in_______________?
33 - Inorganic phase of the composites aid in_______________?
All of the above
34 - Insufficient closure of the flasks during packing of denture base resin can result in_____________?
34 - Insufficient closure of the flasks during packing of denture base resin can result in_____________?
Increase in vertical dimension
35 - Insufficient closure of the flasks during packing of denture base resin can result in_____________?
35 - Insufficient closure of the flasks during packing of denture base resin can result in_____________?
Increase in vertical dimension
36 - Light cure system, side effect is____________?
36 - Light cure system, side effect is____________?
Retinal damage
37 - Macromolecules in Dental Resin is attached by______________?
37 - Macromolecules in Dental Resin is attached by______________?
Covalent bonds
38 - Marginal leakage related to temperature change occurs to the greatest extent with_______________?
38 - Marginal leakage related to temperature change occurs to the greatest extent with_______________?
Unfilled resin
39 - Most advantageous indication of acid etching is______________?
39 - Most advantageous indication of acid etching is______________?
Decrease micro leakage
40 - No trail closure is necessary with which one of the technique during denture fabrication_____________?
40 - No trail closure is necessary with which one of the technique during denture fabrication_____________?
Injection moulding technique
41 - One bottle system of adhesive resins_____________?
41 - One bottle system of adhesive resins_____________?
Separate etching step is still required
42 - One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?
42 - One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?
Are practically insoluble in oral fluids
43 - Polymerisation of heat-cured methyl methacrylate is initiated by______________?
43 - Polymerisation of heat-cured methyl methacrylate is initiated by______________?
Benzoyl peroxide free radical
44 - Porosity of denture base is due to_______________?
44 - Porosity of denture base is due to_______________?
All of the above
45 - Porosity present in a acrylic denture is usually the result of______________?
45 - Porosity present in a acrylic denture is usually the result of______________?
Lack of sufficient pressure applied to flask
46 - Quartz tungsten light cure device minimum output of energy should not be less than_____________?
46 - Quartz tungsten light cure device minimum output of energy should not be less than_____________?
300 mw/sm2
47 - Radio opacity to composite resins is rendered by_______________?
47 - Radio opacity to composite resins is rendered by_______________?
Barium glass and strontium glasses
48 - Residual monomer content of chemically activated resins is______________?
48 - Residual monomer content of chemically activated resins is______________?
2% to 5%
49 - Subsurface porosity is due to_____________?
49 - Subsurface porosity is due to_____________?
Thermal changes
50 - Subsurface porosity is due to_____________?
50 - Subsurface porosity is due to_____________?
Thermal changes
51 - The % of free monomer in a heat – cured acrylic resin is_______________?
51 - The % of free monomer in a heat – cured acrylic resin is_______________?
0.2% to 0.5%
52 - The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?
52 - The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?
0.12569444444
53 - The advantage of unfilled methyl methacrylate is that______________?
53 - The advantage of unfilled methyl methacrylate is that______________?
It can be finished smoothly
54 - The chemical used to etch enamel is_______________?
54 - The chemical used to etch enamel is_______________?
Phosphoric acid
55 - The commonly used laser for curing composite resin is______________?
55 - The commonly used laser for curing composite resin is______________?
Argon
56 - The function of the coupling agent in a restorative resin is to allow______________?
56 - The function of the coupling agent in a restorative resin is to allow______________?
Bonding between tooth and resin
57 - The imperfection seen on the lingual flange of a lower denture caused by rapid heating during a curing cycle is called_____________?
57 - The imperfection seen on the lingual flange of a lower denture caused by rapid heating during a curing cycle is called_____________?
Micro porosity
58 - The latest method of curing denture base resins______________?
58 - The latest method of curing denture base resins______________?
Visible light
59 - The main advantage of composites over unfilled direct filling resin is their_____________?
59 - The main advantage of composites over unfilled direct filling resin is their_____________?
Lower thermal co-efficient of expansion
60 - The most common coupling agents are organic silicon compound called_______________?
60 - The most common coupling agents are organic silicon compound called_______________?
Silane
61 - The most important disadvantage of acrylic denture base is_______________?
61 - The most important disadvantage of acrylic denture base is_______________?
Shrinkage
62 - The particle size in microfilled composites is_____________?
62 - The particle size in microfilled composites is_____________?
0.01 to 0.1 microns
63 - The polymerization of self-curing resin takes faster in______________?
63 - The polymerization of self-curing resin takes faster in______________?
Hot water
64 - The process wherein two or more chemically different monomers, each with some desirable property, can be combined to yield specific physical properties of a polymer is known as_____________?
64 - The process wherein two or more chemically different monomers, each with some desirable property, can be combined to yield specific physical properties of a polymer is known as_____________?
Copolymerization
65 - The restoration which shows percolation and shrinkage along the margins is_____________?
65 - The restoration which shows percolation and shrinkage along the margins is_____________?
Unfilled resins
66 - The type of spatula used to mix composite is________________?
66 - The type of spatula used to mix composite is________________?
Plastic
67 - To cure a heat cure resin, a proper heating cycle is necessary_____________?
67 - To cure a heat cure resin, a proper heating cycle is necessary_____________?
To prevent the porosity
68 - To prevent porosity in self-cure acrylic resin, curing should be carried in______________?
68 - To prevent porosity in self-cure acrylic resin, curing should be carried in______________?
Under vacuum pressure
69 - Use of dimethyl-P-toluidine is indicated for_______________?
69 - Use of dimethyl-P-toluidine is indicated for_______________?
Chemical polymerization
70 - VLC resins are also called as______________?
70 - VLC resins are also called as______________?
Light activated resins
71 - What is the disadvantage of using composites as restorative material ?
71 - What is the disadvantage of using composites as restorative material ?
Decreased wear resistance
72 - What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________?
72 - What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________?
0.06
73 - When restoring a tooth with resin material, acid etching can do all of the following except______________?
73 - When restoring a tooth with resin material, acid etching can do all of the following except______________?
Permit chemical bonding between resin and enamel
74 - Which of the following absorbs maximum amount of water ?
74 - Which of the following absorbs maximum amount of water ?
Microfilled resin
75 - Which of the following constituents is common in occlusal sealants, bonding agents, composite resins ?
75 - Which of the following constituents is common in occlusal sealants, bonding agents, composite resins ?
BIS GMA
76 - Which of the following inhibitor accelerator system uses light activation composite ?
76 - Which of the following inhibitor accelerator system uses light activation composite ?
Diketone-amine
77 - Which of the following is an example of a composite material ?
77 - Which of the following is an example of a composite material ?
A filled resin
78 - Which of the following is NOT true of polymethyl methacrylate ?
78 - Which of the following is NOT true of polymethyl methacrylate ?
Modulus of elasticity of 3.4 GPa
79 - Which of the following is present in the powder of the acrylic resin______________?
79 - Which of the following is present in the powder of the acrylic resin______________?
Methyl methacrylate
80 - Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ?
80 - Which of the following may result if an excessive amount of monomer is incorporated into an acrylic resin mixture ?
Excessive shrinkage
81 - Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________?
81 - Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________?
Addition of difunctional monomers
82 - Which of the following provide opacity to composite ?
82 - Which of the following provide opacity to composite ?
Ti02
83 - Which one of the following is used as filler in composite resins ?
83 - Which one of the following is used as filler in composite resins ?
Quartz
84 - Which one of the following is used as filler in composite resins ?
84 - Which one of the following is used as filler in composite resins ?
Quartz
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