Question: Waxes are used for_______________?

• 1. Primary impression
• 2. Corrective impressions
• 3. Impression of single tooth
• 4. None of the above

Question: A common electrolyte used for plating copper indirect dies is_______________?

• 1. Copper cynide
• 2. Ionic copper
• 3. Acidic copper sulfate
• 4. Silver cyanide

Question: Stainless steel is used mostly in dentistry_________________?

• 1. To strength amalgam
• 2. In orthodontic wires
• 3. To construct clasps for partial dentures
• 4. To replace internal gold restorations

Question: The base constituents of dental waxes come from three main sources except______________?

• 1. Animal
• 2. Mineral
• 3. Insect
• 4. Vegetable

Question: The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?

• 1. Utility wax
• 2. Base plate wax
• 3. Beading wax
• 4. Boxing wax

Question: The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called__________?

• 1. Pinhole porosity
• 2. Gas inclusion porosity
• 3. Micro porosity
• 4. Subsurface porosity

Question: Function of carnauba wax_________________?

• 1. To provide a smooth and glossy surface
• 2. Increase toughness
• 3. Decrease toughness
• 4. Decrease flow at room temperature

Question: Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?

• 1. Platinum
• 2. Copper
• 3. Silver
• 4. Gold

Question: Softening heat treatment of alloy increases_________________?

• 1. Tensile strength
• 2. Proportional limit
• 3. Ductility
• 4. Hardness

Question: The function of a sprue is to_______________?

• 1. Form an opening of molten metal to enter the mold
• 2. Help polish cast restorations
• 3. Eliminate air bubbles on the wax pattern
• 4. Reproduce fine detail