On microscopic examination enamel rods have___________?

Related Mcqs:

1. 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

2. Oral tissue for microscopic examination is prepared by_______________?

   A. Embedded in paraffin and sectioned
   B. Embedded in paradion and sectioned
   C. Frozen and sectioned
   D. Specimens ground into thin sections
   E. All of the above

3. Electron microscopic examination of the bacterial flora of necrotising ulcerative gingivitis indicates the presence of microorganisms within non-necrotic tissues in advance of other bacteria. The organisms involved are______________?

   A. Cocci
   B. Spirochetes
   C. Bacteriophages
   D. Filamentous rods

4. 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

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

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

6. Length of enamel rods is_____________?

   A. Greater than the thickness of enamel
   B. Less than the thickness of enamel
   C. Equal to the thickness of enimal
   D. None of the above

7. Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are______________?

   A. Straight
   B. Shallow
   C. Bent
   D. Curved

8. The average width of enamel rods is______________?

   A. 10mm
   B. 5mm
   C. 2mm
   D. 0.5mm

9. Dark bonds that are present in enamel rods at intervals of 4 μms are______________?

   A. Neonantal bands
   B. Cross striations
   C. Striae of Retzius
   D. Hunter-Schregar bands

10. The direction of enamel rods in decidous teeth is_____________?

    A. Same as permanent teeth
    B. Inclined in an apical direction in the cervical third of crown
    C. Inclined in an occlusal direction in the cervical third of crown
    D. None of the above