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
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