Question: Dead tracts in ground section appears as_____________?

• 1. Dentinal tubules
• 2. Coarse fibril bundles arranged at right angle to the dentinal surface
• 3. Black in transmitted light and white in reflected light
• 4. White in transmitted light and dark in reflected light

Question: Dentinal tubules are______________?

• 1. Concave
• 2. Straight
• 3. S0shaped
• 4. None of the above

Question: The percentage of inorganic matter in fully developed enamel is about____________?

• 1. 66%
• 2. 76%
• 3. 86%
• 4. 96%

Question: Non acidic, nonionic protein which helps in enamel mineralization _______________?

• 1. Tuftelin
• 2. Sheathlin
• 3. Enamelin
• 4. Amelogenin

Question: Which of the following is correct about enamel crystals ?

• 1. Same as dentin crystals
• 2. Contains organic portion in the center
• 3. Roughly texagonal in shape
• 4. Their diameter is about 5 microns in size

Question: Maximum amount of phosphate is seen in_______________?

• 1. Bone
• 2. Enamel
• 3. Gingiva
• 4. Dentin

Question: Neonatal lines are seen in_______________?

• 1. Enamel of deciduous incisiors
• 2. Enamel of permanent incisors
• 3. Enamel of premolars
• 4. Dentin of all teeth, as if is formed first

Question: narled enamel is seen in_____________?

• 1. Proximal surface of tooth
• 2. Cervical region of tooth
• 3. Cusp tips of tooth
• 4. All of the above

Question: The thickness of prismless enamel in diciduous teeth is______________?

• 1. 25 μ m
• 2. 50 μ m
• 3. 75 μ m
• 4. 100 μ m

Question: Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are______________?

• 1. Straight
• 2. Shallow
• 3. Bent
• 4. Curved