Question

The layer of cells that secrete the enamel of the tooth is
A. Dentoblast
B. Ameloblast
C. Osteoblast
D. Odontoblast

Answer 1

Hint: The outer layer of the visible tooth is made up of enamel (hardest tissue in the human body). The enamel is formed by the differentiation of dental epithelial cells.

Complete answer: The ameloblasts cells secrete two enamel proteins namely, enamelin and amelogenin. Both ionic and organic compositions are controlled by ameloblasts.
In theory, it is said that on a daily cycle enamel production by the ameloblasts is regulated by the circadian clock (24 hours). This is similar to the production of bone tissue by osteoblasts.
Bone cells are formed by osteoblasts.
Odontoblasts are responsible for the formation of dentine of the tooth.
Dentoblasts are dental stem cells. This is responsible for the growth of a tooth.
Ameloblasts are responsible for the formation of the enamel of the tooth.

So, the correct answer is “Option B”.

Additional Information: Enamel is one of the four major tissues which make up the tooth. Other major issues include dentine dental pulp and cementum.
1. Enamel forms the first visible part (covering the crown) of the tooth.
2. It is hard because of calcium.
3. It is very hard and acts as a protective layer by covering the dentine.
4. The dentine of the tooth could be degraded by the acids present in food and drink.
This is prevented by enamel. Enamel is a highly mineralized substance.
5. It contains about 96% of minerals.

Note: Ameloblasts cells deposit enamel of the tooth and are only present during the development of the tooth.