Question: Physically and chemically, the dentin is closely related to______________?

• 1. Bone
• 2. Acellular cementum
• 3. Enamel
• 4. None of the above

Question: The microhardness of dentin is about____________?

• 1. 1/2 that of enamel
• 2. 1/7 that of enamel
• 3. 1/4 that of enamel
• 4. 1/5 that of enamel

Question: Dentinogenesis by odontoblasts first begins at_____________?

• 1. Pulpal end
• 2. Cusp tip
• 3. Tooth bud stage
• 4. Cervical area

Question: The zone of dentin most recently formed and uncalcified is known as____________?

• 1. Mantle dentin
• 2. Circumpulpal dentin
• 3. Predentin
• 4. Secondary dentin

Question: The dentin receptors are unique because_____________?

• 1. They elicit pain to hot and cold
• 2. They elicit pain to touch and pressure
• 3. They elicit pain to chemicals
• 4. Elicit only pain as a response

Question: Mirgration of odontoblasts into dentinal tubules occurs during ________________?

• 1. Cavity preparation
• 2. Dehydration
• 3. Water irrigation
• 4. None of the above

Question: The dentin adjacent to the dentinoenamel junction is called the______________?

• 1. Mantle dentin
• 2. Circumpulpal dentin
• 3. Predentin
• 4. Secondary dentin

Question: Which of the following dentinal layers is more mineralized______________?

• 1. Peritubular dentin
• 2. Inter tubular dentin
• 3. Dentinal tubules
• 4. Circum pulpal dentin

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