Oral Histology MCQs

Page No. 13

calcification in enamel starts at____________?


a Enamel matrix


b Root


cCEJ


dDEJ


View Answer DEJ

Inorganic content of enamel is about______________?


a 35%


b50%


c4%


d96%


View Answer 96%

The diameter of the rod is______________?


a4 μ m


b 9 μ m


c7 μ m


d2 μ m


View Answer 4 μ m

True about direction of enamel rods______________?


aThey originate at right angle to dentin surface


bThey are almost vertical near the incisal edge (or) cusp tip areas


cIn the cervical third of deciduous crowns they are almost horizontal in direction


dAll of the above


View Answer All of the above

Dentino enamel junction is_________________?


aNon-scalloped


bStraight


cScalloped and the convexities are directed towards dentin


dScalloped and the convexities are directed towards enamel



Chronological hypoplasia is_____________?


aHypoplasia of local origin


b Hypoplasia of systemic origin


cHypoplasia of hereditary origin


dNone of the above



Formation of dentin by odontoblasts begins in_______________?


aMorphogenic stage


bOrganizing stage


cDesmolytic stage


dFormative stage


View Answer Organizing stage

The striking difference between enamel and other mineralized tissues is______________?


aPresence of high percentage of organic matrix


b Presence of incremental lines


cEnamel has high reparative capacity


dMost of organic component is lost during mineralization



Enamel is laid down______________?


aMainly by odontoblasts


bMainly by ameloblasts


cOnly on odontoblasts


dOnly by ameloblasts


View Answer Only by ameloblasts

Synthesis of enamel matrix proteins occurs in the________________?


a Outer enamel epithelium


bAmeloblast


cStratum intermedium


dStratum granulosum


View Answer Ameloblast

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