A. Cracks
B. Pellicle
C. perikymata
D. Enamel lamellae
Related Mcqs:
- 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 - Smooth surface caries is characterized by spread of caries in enamel and dentin as cones. These alignment in enamel and dentin is____________?
A. Base to base
B. Apex to base
C. Apex to apex
D. None of the above - Temporary structures in enamel organ are (before enamel formation) ?
A. Enamel knot
B. Enamel cord
C. Both A and B
D. Enamel Cuticle - Incremental lines of Retzius appear_____________?
A. As lines in the enamel running at right angles to the enamel surface
B. As lines in the dentin running at right angles to the dentino-enamel junction
C. In enamel and follow the apposition pattern
D. In dentin and follow the appositional pattern - Incremental lines of retzius are seen in______________?
A. Enamel
B. Dentin
C. Cementum
D. Pulp - All are true about the striae of retzius except___________?
A. Constitute the rest lines with in the enamel rods
B. Have high inorganic content
C. They are areas of increased porosity
D. Allow the movement of water and small ions - Thin leaf like structures that extend from enamel surface in to DEJ are____________?
A. Enamel spindles
B. Enamel lamella
C. Enamel tufts
D. Perikymata - Ionic exchange between enamel surface and environment______________?
A. Does not take place once enamel surface and invironment
B. Stops after 2 years of eruption
C. Continues till adult life
D. Continues through out life - Non acidic, nonionic protein which helps in enamel mineralization _______________?
A. Tuftelin
B. Sheathlin
C. Enamelin
D. Amelogenin - A deep pit lined by enamel seen in the lingual surface of Maxillary lateral incipor is most likely to be_______________?
A. Dens in dente
B. Enamel Hypoplasia
C. Talon’s cusp
D. Enamel Pearl
