Oral Histology MCQs

Page No. 12

The percentage of inorganic matter in fully developed enamel is about____________?


a66%

✖


b 76%

✖


c86%

✖


d 96%

✓


View Answer 96%

Hunter Schreger band are____________?


aDark and light bands of enamel seen in longitudinal ground section

✓


b Dark and light bands of enamel seen in horizontal ground section

✖


cDark and light brands of dentin seen in longitudinal section

✖


d Dark and light bands of dentin seen in horizontal

✖



Following is not an external manifestation of enamel________________?


aEnamel tufts

✓


b Enamel lamella

✖


cIncremental lines of enamel

✖


d Enamel cuticle

✖


View Answer Enamel tufts

Blunt cell processes seen on the developing ameloblasts are celled as________________?


aTomes fibres

✓


b Tomes layer

✖


cTomes processes

✖


dOdontoblastic processes

✖


View Answer Tomes fibres

Incremental lines of retzius are seen in______________?


aEnamel

✓


bDentin

✖


c Cementum

✖


dPulp

✖


View Answer Enamel

Ionic exchange between enamel surface and environment______________?


aDoes not take place once enamel surface and invironment

✖


bStops after 2 years of eruptio

✖


cContinues till adult life

✖


dContinues through out life

✓



All are true about the striae of retzius except___________?


aConstitute the rest lines with in the enamel rods

✖


bHave high inorganic content

✓


cThey are areas of increased porosity

✖


dAllow the movement of water and small ions

✖



On microscopic examination enamel rods have___________?


aKey hole appearance in cross section

✓


bPaddle appearance in cross section

✖


cLanullate appearance in cross-section

✖


dNone of the above

✖



The formative cells of which of the following dental tissues disappear once tissue is formed___________?


a Enamel

✓


bDentin

✖


cPeriodontal ligament

✖


dCementum

✖


View Answer Enamel

The enamel has no capacity of self repair because______________?


a It has only a small percent of organic content

✖


b Its formative cells are lost once it is completely formed

✓


cIt is essentially a keratin tissue and has no blood vessels

✖


dIt has no direct connection with the active cells of the dental pulp

✖



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