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NEET MDS Quiz - Practice Test

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dental anatomy - 3 Questions

1
Dental Anatomy

Reparative dentin is also called:
1). Secondary dentin
2). Tertiary dentin
3). Primary dentin
4). Mantle dentin

📝 Explanation:

Tertiary dentin includes reactionary dentin (formed by surviving odontoblasts) and reparative dentin (formed by new odontoblast-like cells). It is atubular and irregular.

2
Dental Anatomy

Type of collagen in dentin:
1). Type II
2). Type I (90%), Type III, V
3). Type IV
4). Type VII

📝 Explanation:

Type I collagen makes up about 90% of the organic matrix of dentin. Small amounts of type III and V are also present. Type IV collagen is found in the basement membrane.

3
Dental Anatomy

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

📝 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.

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