Structure Of Tooth

Structure of tooth

Enamel 1 Dentine 2 Pulp3 cavity

Crown Neck

Gum 4 Cement 5 Periodontal 6 membrane Jaw7 bone

Root

Enamel Contains 97% calcium salt

Crown Neck

The hardest Root Protect the tooth against wearing during chewing

1 Enamel

Enamel would not grow down into the root region but

1 Enamel

Enamel would not grow down into the root region but it is replaced by

cement Cement

Periodontal Fibre membrane Fibres from the cement pass into the jawbone to anchor the tooth forming periodontal membrane

Cement

Dentine occupies a large part of the tooth softer than enamel contains strands of cytoplasm & is described as living structures

Crown Neck

Root

Contains living cells which make dentine

Pulp cavity Contains blood capillaries which supply O2 & nutrients Contains nerves which produce sensation of pain

Crown Neck

Root

Types of teeth Molar

Premolar

Incisor

Canine

Types Location Shape Function

Incisor At the front of the jaw

Chisel-shaped Biting & cutting

Types Location

Canine At the front of the jaw, next to the incisor

Shape Pointed

(Long & curved in carnivores)

Function

Biting & cutting (for tearing food in carnivores)

Types Location Shape Function

Premolar At the side of the jaw Broad top with ridges With two cusps (projections)

Crushing & grinding

Types Location Shape Function

Molar At the back of the jaw Broad top with ridges With four cusps (projections)

Crushing & grinding

Wisdom teeth are the last molars

Two sets of teeth Milk teeth

The first set of teeth appears early in a child

Milk teeth will be replaced by permanent teeth

Permanent teeth

Left

Dentition

Right Front

Back 4

3

2

1 How are the teeth

Molar

Premolar

Canine

incisor

arranged in the jaw?

Left Upper jaw

Right Front

Back 4

Lower jaw

Molar 3 m 3

3

Premolar

pm 2 2

2

Canine

1 c 1

1

Dentition What is the

number of each type of teeth in the jaw ?

incisor 2 i 2

Upper jaw Lower jaw

Left Upper jaw

Right Front

Back 4

Lower jaw

Molar 3 m 3

Dentition

3

Premolar

pm 2 2

2

Canine

1 c 1

1

What is the

number of each type of teeth in the jaw ?

incisor 2 i 2

Show right or left side only Total number = 16 x 2 = 32

2 i 2

1 c 1

2 pm 2

3 m 3

This presentation is called

dental formula It shows the number & arrangement of the different types of teeth in a mammal

Milk teeth

2 1 c i 1 2

Dental formula

2 m 2 Permanent teeth

2 2 1 3 m pm c i 3 1 2 2