The tooth (5243)

Diploma in medical Technology 4th Semester Dental Technology under Bangladesh Technical Education Board.

Oral and dental anatomy-2 (5243)

What is tooth?

A tooth is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores, also use teeth for hunting or for defensive purposes.

Parts of tooth

Generally tooth have three parts

  1. Crown

  2. Neck

  3. Root

It is also divided into four the sectional parts.

  1. Enamel

  2. Dentin

  3.Cementum

 4. Pulp

for detail click here..

Functions of teeth

1. Helps in mastication.

2. Aid in articulation and speech.

3. Give shape and beauty of face.

4. Help in self protection and attack.

5. Contribute to growth of the jaw.

Number of teeth

Deciduous teeth :

20 in number, 10 in each jaw. They start appearing in the mouth at the age of 6 months and continue to do so till the age of 2.5 to 3 years.

The deciduous teeth are :-

  Central incisor  - 4 in number

  Lateral incisor  - 4 in number

  Canine   - 4 in number

  First molar  - 4 in number

  Second molar   - 4 in number

  Total      - 20 in Number.

Permanent teeth :

32 in number, 16 in each jaw. They start appearing at the age of 6 years. By the age of 13 years, 28 teeth have erupted. The third molar or wishdom teeth appear any time between 18 to 25 years.

The permanent teeth are –

  Central incisor  - 4 in number

  Lateral incisor  - 4 in number

  Canine   - 4 in number

  First premolar  - 4 in number

  Second premolar   - 4 in number

  First molar  - 4 in number

  Second molar  - 4 in number

  Third molar   - 4 in number

  Total   - 32 in number.