Question: Which of the following tissues have no reparative capacity______________?

• 1. Enamel
• 2. Dentin
• 3. Cementum
• 4. Periodontal ligament

Question: Which of the following structures is not of ectodermal origin_______________?

• 1. Hunter schreger bands
• 2. Enamel spindles
• 3. Enamel tufts
• 4. Enamel lamellae

Question: Neonatal lines are found in all of the following except____________?

• 1. Enamel of primary incisors
• 2. Enamel of permanent canines
• 3. Enamel and dentin of permanent first molars
• 4. Dentin of permanent mandibular incisors

Question: Approximately how many enamel rods will be present in a maxillary molar ?

• 1. 5 million
• 2. 7 million
• 3. 9 million
• 4. 12 million

Question: All are true regarding the enamel spindles except____________?

• 1. Produced by ameloblasts
• 2. Found in the region of cusps
• 3. Surrounded by inter prismatic enamel
• 4. Terminate as rounded process

Question: Interwining of the enamel rods at the cusp timps and the incisal edges of a tooth is called______________?

• 1. Enamel spindles
• 2. Gnarled enamel
• 3. Incremental lies of woven
• 4. Incremental lines of retzius

Question: Ratio of diameter of enamel rods in the DEJ to the enamel surface is______________?

• 1. 1:4
• 2. 1:1
• 3. 1:2
• 4. 2:1

Question: Enamel tufts are_______________?

• 1. Thin tuft like structure extending from enamel surface of dentin enamel junction
• 2. Tuft like structure arising from dentin-enamel junction towards enamel surface
• 3. Odontoblastic processes extending into enamel
• 4. None of the above

Question: The enamel of the posterior teeth is thickest at____________?

• 1. Cervical third of buccal surface
• 2. Middle third of buccal surface
• 3. Middle third of lingual surface
• 4. Occlusal surface

Question: perikymata are the external surface manifestations of_____________?

• 1. Enamel rods
• 2. Incremental lines of retzius
• 3. Nasmyth’s membrane
• 4. Pellicle