During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?
A. 25°C
B. 37°C
C. 50°C
D. 60°C
Restorative Resins
Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
A. 10 um – 20 um
B. 3 um – 9 um
C. 50 um – 110 um
D. 200 um – 250 um
The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?
The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?
A. 3:1
B. 4:1
C. 10:1
D. 5:1
Residual monomer content of chemically activated resins is______________?
Residual monomer content of chemically activated resins is______________?
A. 0.2% to 0.5%
B. 2% to 5%
C. 0.3% to 0.5%
D. 2% to 5%
Dentin conditioner has the following function______________?
Dentin conditioner has the following function______________?
A. Removes smear layer
B. Increases surface energy of dentin
C. Forms a thin resin layer over exposed collagen fibrils
D. Helps in bonding with composite
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_____________?
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_____________?
A. Step-growth polymerization
B. Addition polymerization
C. Condensation polymerization
D. Copolymerization
Denture acrylics contain cross-linking agents mainly to improve their_____________?
Denture acrylics contain cross-linking agents mainly to improve their_____________?
A. Internal color
B. Tissue compability
C. Surface hardness
D. Craze resistance
Quartz tungsten light cure device minimum output of energy should not be less than_____________?
Quartz tungsten light cure device minimum output of energy should not be less than_____________?
A. 300 mw/sm2
B. 350 mw/cm2
C. 400 mw/cm2
D. 450 mw/cm2
Polymerisation of heat-cured methyl methacrylate is initiated by______________?
Polymerisation of heat-cured methyl methacrylate is initiated by______________?
A. Tertiary amine
B. Benzoyl peroxide free radical
C. Hydroquinone
D. Methyl ether
In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?
In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?
A. Throughout the denture
B. Near the borders
C. In the thickest part
D. On the denture surface