The document discusses the anatomy and function of teeth, highlighting their importance in food breakdown, speech, and facial aesthetics. It describes the structure of a tooth, which includes the crown, neck, root, and four components: enamel, dentin, cementum, and pulp. Additionally, it outlines the number of deciduous teeth (20) and permanent teeth (32), including their eruption timelines.

1. Oral & Dental Anatomy-2
Subject Code: 5243

2. MD. SHAHAB UDDIN AHMED
LECTURER
DEPARTMENT OF DENTAL TECHNOLOGY
CITY MEDICAL INSTITUTE KHULNA

3. 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.
What is tooth?

4. 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

5. Parts of a tooth

6. Functions of teeth
Helps in mastication.
Aid in articulation and speech.
Give shape and beauty of face.
Help in self protection and attack.
Contribute to growth of the jaw.

7. 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.

8. Number of teeth
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.