Phenomenon in which porcelain appears different under varying light condition is______________?
A. Translucency
B. Refractive optics
C. Metamerism
D. Opacification
Dental Materials
In porcelain metal elements are embedded in the matrix of________________?
In porcelain metal elements are embedded in the matrix of________________?
A. Rubber matrix
B. Glass
C. Plastic
D. Resin matrix
Porosity in porcelain at condensation stage depends on_________________?
Porosity in porcelain at condensation stage depends on_________________?
A. Shape and size of particle
B. Uniform distribution of particle size
C. Number of particles
D. None of the above
The opacity in ceramics is achieved by adding_______________?
The opacity in ceramics is achieved by adding_______________?
A. Boric oxide
B. Copper oxide
C. Silica
D. Titanium oxide
Porcelain denture teeth________________?
Porcelain denture teeth________________?
A. Have a higher coefficient of thermal expansion than acrylic teeth:
B. Have a lower abrasion resistance than enamel
C. Should be used where the inter dental clearance is small
D. Have a higher abrasion resistance than gold
Glass ionomer cements are composed of______________?
Glass ionomer cements are composed of______________?
A. Alumino silicate powder and phosphoric acid
B. Aluminosillicate powder and polyacrylate
C. Zinc oxide powder and phosphoric acid
D. Zinc oxide powder and polyacrylate liquid
Minimum thickness for type I zinc phosphate cement should be_______________?
Minimum thickness for type I zinc phosphate cement should be_______________?
A. 15 microns
B. 25 microns
C. 50 microns
D. 100 microns
Which of the following is common to both zinc eugenol cement and polycarboxylate cement?
Which of the following is common to both zinc eugenol cement and polycarboxylate cement?
A. Polyacrylic acid is liquid
B. Chemical bond to tooth structure
C. Chelation
D. Substitution o eugenol by EBA to increase strength of cement
The addition of which of the following can accelerate the setting time of zinc oxide cement_____________?
The addition of which of the following can accelerate the setting time of zinc oxide cement_____________?
A. Zinc acetate
B. Barium sulphate
C. Zinc sulphate
D. Barium chloride
pH of fully set zinc phosphate______________?
pH of fully set zinc phosphate______________?
A. 3-4
B. 4-5
C. 6-7
D. 7-8