Dental Anatomy NEET MDS Practice Test

1

Dental Anatomy

Which incremental line in dentin corresponds to 5-day rhythm (like Retzius)?
1). Lines of von Ebner = daily, Andersen lines? Actually long-period lines every 5 days correspond to 5 von Ebner lines, equivalent to striae of Retzius in enamel
2). Neonatal line
3). Owen's contour
4). None

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

Long-period incremental lines occur approximately every 5 days and are about 20 microns apart. They are equivalent to the striae of Retzius in enamel.

2

Dental Anatomy

Dentinal fluid is:
1). Pure water
2). Extracellular fluid / transudate of plasma from pulp via odontoblasts
3). Saliva
4). Intracellular fluid

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

Dentinal fluid is the basis of the hydrodynamic theory of sensitivity. Fluid movement in tubules stimulates mechanoreceptors near the pulp. Normally, there is an outward flow.

3

Dental Anatomy

Cause of interglobular dentin increased in rickets:
1). Vitamin D deficiency leads to failure of calcospherite fusion
2). Fluoride excess
3). Calcium excess
4). Vitamin A deficiency

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

Vitamin D deficiency leads to hypomineralization due to a low calcium-phosphate product. Globular mineralization fails, increasing interglobular dentin.

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