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NEET MDS Quiz - Practice Test
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Practice Test

Dental Anatomy - 3 Questions

1
Dental Anatomy
The beginning of active eruption of a human tooth occurs
1. before the root has begun to develop
2. coincidental with the beginning of root formation
3. before the root has begun to develop
4. after one half of the root is formed

📝 Explanation:

The beginning of active eruption of a human tooth occurs after one half of the root is formed

2
Dental Anatomy
When extracting a primary maxillary incisor in which the root has been partially resorbed because of pres sure from its developing succe daneous tooth, which aspect of the remaining primary root will usually be longest and attached most securely to the gingiva?
1. Facial
2. Mesial
3. Lingual
4. Distal

📝 Explanation:

In the case of primary teeth, the roots are often resorbed as the permanent teeth develop. The facial aspect of the root tends to be the last area to undergo resorption due to its position and the way the succedaneous tooth exerts pressure. The facial root surface is generally more stable and remains attached to the gingiva longer than the other aspects, making it the longest and most securely attached during extraction.

3
Dental Anatomy

The secretory product of odontoblasts is:

1) Topocollagen.
2) Calcium salts.
3) Mantle dentin.
4) Hydroxyapatite

📝 Explanation:


Dentinogenesis is the formation of dentin by odontoblasts of mesenchymal origin located at the periphery of the dental pulp

Dentinogenesis is initiated by the inductive influence of the enamel organ involving molecular signaling pathways, such as Wnt, Runx-2, and TGF-?. In the molar tooth, dentinogenesis starts at the late bell stage, and occurs in the crown as well as root regions.

Predentin, the first organic matrix secreted by odontoblasts, is composed by proteoglycans, glycoproteins, and collagens.

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