Question: The melting point of titanium is __________ degree celsius?

• 1. 1056
• 2. 1560
• 3. 1668
• 4. 1886

Question: Electrolyte used for plating copper dies is________________?

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

Question: Greening occuring when porcelains are fired on silver free alloys may be attributed to________________?

• 1. Vaporization of silver from the walls of contaminated furnaces
• 2. Surface diffusion of silver from the marginal metal
• 3. More rapid silver diffusion in sodium containing glass
• 4. Silver ionization by porcelains with high oxygen potential

Question: Compared with dental alloys, CERAMICS show____________________?

• 1. High ductility
• 2. High hardness
• 3. Low esthetic value
• 4. Susceptibility to brittle fracture

Question: Chemical method of strengthening porcelain involves_________________?

• 1. Exchange of aluminium and sodium ions
• 2. Exchange of aluminium and potassium ions
• 3. Exchange of sodium and potassium ions
• 4. None of the above

Question: The first porcelain tooth material was introduced by______________?

• 1. DeChemant
• 2. Ash
• 3. Plateau
• 4. McClean

Question: Which of the following bur is used in the preparation of cavity restored with porcelain fused to metal ?

• 1. Carbide bur
• 2. Diamond bur
• 3. Stainless steel bur
• 4. Diamond but for porcelain and carbide bur for metal

Question: Quartz is Dental porcelain is______________?

• 1. Strengthener
• 2. Binder
• 3. Pigment
• 4. Crack minimzer

Question: In method of firing: A shorter firing period at a higher temperature is considered better_______________?

• 1. A large time period at a lower temperature is preferred
• 2. A long firing period at a very high temperature is preferred
• 3. A short firing period at a very low temperature is preferred
• 4. none of these

Question: Porcelain binds to metal in PFM crown by_________________?

• 1. Metallic bind
• 2. Transparency
• 3. Chemical bond
• 4. B and C