Structure of Structure of toothtooth

Crown

Neck

Root

1

2

3

4

5

6

7

Enamel

Dentine

Pulp cavity

Gum

Cement

Periodontal membrane

Jaw bone

Protect the tooth against wearing during chewing

Crown

Neck

Root

The hardest

Contains 97% calcium salt

Enamel

1Enamel

Enamel would not grow down

into the root region but

1Enamel

Enamel would not grow down

into the root region but

it is replaced by

cement

Cement

Cement

Fibres from the cement pass into the jawbone

Fibre

to anchor the tooth

forming periodontal membrane

Periodontal membrane

Crown

Neck

Root

Dentine

occupies a large part of the tooth

softer than enamel

contains strands of cytoplasm & is described as

living structures

Crown

Neck

Root

Pulp cavity

Contains living cells

which make dentine

Contains blood capillaries

which supply O2 & nutrients

Contains nerves which produce sensation of pain

Incisor

CaninePremolar

Molar

Types of teethTypes of teeth

TypesTypes Incisor

LocationLocation At the front of the jaw

ShapeShape Chisel-shaped

FunctionFunction Biting & cutting

TypesTypes

LocationLocation

ShapeShape

FunctionFunction

CanineAt the front of the jaw,

next to the incisor

Pointed (Long & curved in carnivores)

Biting & cutting(for tearing food in carnivores)

TypesTypes

LocationLocation

ShapeShape

FunctionFunction

Premolar

At the side of the jaw

Broad top with ridges With two cusps

(projections)Crushing & grinding

TypesTypes

LocationLocation

ShapeShape

FunctionFunction

Molar

At the back of the jaw

Broad top with ridges With four cusps

(projections)Crushing & grinding

Wisdom teeth

Wisdom teeth

are the last molarsare the last molars

Permanent teeth

Milk teeth

Two sets of teeth

The first set of teeth appears early in a child

Milk teeth will be replaced by

permanent teeth

DentitionLeft

Right

How are the teeth

arranged

in the jaw?

How are the teeth

arranged

in the jaw?

incisor

1

Canine

2

Premolar

3

Molar

4Front Back

Front Back

DentitionLeft

Right

incisor

1

Canine

2

Premolar

3

Molar

4

i

2 2

What is the

number

of each type of teeth in the jaw ?

What is the

number

of each type of teeth in the jaw ?

Upper jawLower jaw

Upper jaw

Lower jaw

c

1 1

pm

2 2

m

3 3

Front Back

DentitionLeft

Right

incisor

1

Canine

2

Premolar

3

Molar

4

What is the

number

of each type of teeth in the jaw ?

What is the

number

of each type of teeth in the jaw ?

Upper jaw

Lower jaw

Total number = 16 x 2 = 32

Show right or left side onlyi

2 2

c

1 1

pm

2 2

m

3 3

i22

c11

pm22

m33

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

This presentation is called

dental formula

i 22

c 11

m22

Milk teeth Dental formula

i 22

c 11

pm22 3

3m

Permanent teeth