Question 137 · LDEK · Dentin
Indicate the true information concerning dead tracts observed in tooth tissues:
1) dead tracts appear in enamel;
2) dead tracts appear in dentin;
3) these are pores in the sub-surface, demineralized enamel layer;
4) these are empty dentinal tubules;
5) they are formed by odontoblast-like cells differentiated from mesenchymal cells of the pulp.
The correct answer is:
2) dead tracts appear in dentin;
3) these are pores in the sub-surface, demineralized enamel layer;
4) these are empty dentinal tubules;
5) they are formed by odontoblast-like cells differentiated from mesenchymal cells of the pulp.
The correct answer is:
- A. 1,4.
- B. 1,5.
- C. 2,3.
- D. 2,4.
- E. 2,5.
Hint
Dead tracts appear as dark bands in ground sections; think about which tissue contains tubules and what remains when their cell processes die.
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