311. All are true regarding the enamel spindles except____________?

A. Produced by ameloblasts
B. Found in the region of cusps
C. Surrounded by inter prismatic enamel
D. Terminate as rounded process

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

A. Enamel spindles
B. Gnarled enamel
C. Incremental lies of woven
D. Incremental lines of retzius

313. Ratio of diameter of enamel rods in the DEJ to the enamel surface is______________?

A. 1:4
B. 1:1
C. 1:2
D. 2:1

314. Enamel tufts are_______________?

A. Thin tuft like structure extending from enamel surface of dentin enamel junction
B. Tuft like structure arising from dentin-enamel junction towards enamel surface
C. Odontoblastic processes extending into enamel
D. None of the above

315. The enamel of the posterior teeth is thickest at____________?

A. Cervical third of buccal surface
B. Middle third of buccal surface
C. Middle third of lingual surface
D. Occlusal surface

316. perikymata are the external surface manifestations of_____________?

A. Enamel rods
B. Incremental lines of retzius
C. Nasmyth’s membrane
D. Pellicle

317. Which of the following tissues have no reparative capacity______________?

A. Enamel
B. Dentin
C. Cementum
D. Periodontal ligament

318. Which of the following structures is not of ectodermal origin_______________?

A. Hunter schreger bands
B. Enamel spindles
C. Enamel tufts
D. Enamel lamellae

319. Neonatal lines are found in all of the following except____________?

A. Enamel of primary incisors
B. Enamel of permanent canines
C. Enamel and dentin of permanent first molars
D. Dentin of permanent mandibular incisors

320. Approximately how many enamel rods will be present in a maxillary molar ?

A. 5 million
B. 7 million
C. 9 million
D. 12 million

NOTE
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