MDS PREP
What are the main advantages of using light-cured resins over chemically cured resins?
1) Less shrinkage, better aesthetics, and improved bond strength.
2) Lower cost and less sensitivity to moisture.
3) Faster setting and less technique sensitive.
4) Both A and C.
Light-cured resins generally have less shrinkage and are more aesthetically pleasing due to their ability to be polymerized to a higher degree. They also offer improved bond strength compared to chemically cured resins.
Which of the following waxes exhibits 100% flow at mouth temperature?
1) Bite registration wax
2) Corrective impression wax
3) Modelling wax
4) Inlay wax
Dental Materials Answer: 2
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
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 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
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