MDS PREP
What is the purpose of adding barium sulfate to Gutta Percha?
1) To make it more radio-opaque
2) To improve thermal conductivity
3) To enhance the setting reaction
4) To act as a plasticizer
Barium sulfate is added to Gutta Percha to enhance its radiographic visibility.
Gum dammer of dammer resin is a natural resin added to paraffin to improve its smoothness in moulding and will render it more
1) Toughness
2) Resistant
3) Smoothness
4) Flow
Dental Materials Answer: 3
The type of gold recommended in occlusal load bearing areas is
1) Annealed gold
2) Gold foil
3) Matgold
4) Powdered gold
Dental Materials Answer: 3
Dentin bonding agents usually contain
1) Only hydrophobic component
2) Only hydrophilic component
3) Hydrophobic and hydrophilic
4) Lyophillic and lyophobic component
Dental Materials Answer: 2
Restoration that resembles dental caries radiographically
1) Ca(OH)2
2) Zinc oxide eugenol
3) Amalgam
4) Zinc phosphate
Dental Materials Answer: 1
Resin penetrates collagen network of dentin but does not penetrate completely a small gap between mineralized matrix of dentin and collagen-resin hybrid layer is called nanoleakage is about
1) > 0.1
2) < 0.1
3) > 0.2
4) < 0.2
Dental Materials Answer: 1
The calcium is added to direct filling gold to
1) Increase the smoothness of the gold
2) Increase the strength and hardness
3) Increase the corrosion resistance
4) All of the above
Dental Materials Answer: 2
One of the purposes of etching beveled enamel surface is to
1) Increased surface energy
2) Produce macro undercut
3) To increase convenience
4) To prevent caries
Dental Materials Answer: 1