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.Management Sciences
Category: Enamel
Following is not an external manifestation of enamel________________?
A. Enamel tufts
B. Enamel lamella
C. Incremental lines of enamel
D. Enamel cuticle
On microscopic examination enamel rods have___________?
A. Key hole appearance in cross section
B. Paddle appearance in cross section
C. Lanullate appearance in cross-section
D. None of the above
The percentage of inorganic matter in fully developed enamel is about____________?
A. 66%
B. 76%
C. 86%
D. 96%
Neonatal lines are seen in_______________?
A. Enamel of deciduous incisiors
B. Enamel of permanent incisors
C. Enamel of premolars
D. Dentin of all teeth, as if is formed first
Enamel is laid down______________?
A. Mainly by odontoblasts
B. Mainly by ameloblasts
C. Only on odontoblasts
D. Only by ameloblasts
Hertwig’s root sheath is formed from______________?
A. Stratum inter medium
B. Stellate reticulum
C. Outer enamel epithelium
D. Cervical loop
The striking difference between enamel and other mineralized tissues is______________?
A. Presence of high percentage of organic matrix
B. Presence of incremental lines
C. Enamel has high reparative capacity
D. Most of organic component is lost during mineralization
Which of the following tissues have no reparative capacity______________?
A. Enamel
B. Dentin
C. Cementum
D. Periodontal ligament
Blunt cell processes seen on the developing ameloblasts are celled as________________?
A. Tomes fibres
B. Tomes layer
C. Tomes processes
D. Odontoblastic processes
The diameter of the rod is______________?
A. 4 μ m
B. 9 μ m
C. 7 μ m
D. 2 μ m
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