structure of tooth
DESCRIPTION
Structure of tooth (F.3)TRANSCRIPT
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Structure of Structure of toothtooth
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Crown
Neck
Root
1
2
3
4
5
6
7
Enamel
Dentine
Pulp cavity
Gum
Cement
Periodontal membrane
Jaw bone
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Protect the tooth against wearing during chewing
Crown
Neck
Root
The hardest
Contains 97% calcium salt
Enamel
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1Enamel
Enamel would not grow down
into the root region but
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1Enamel
Enamel would not grow down
into the root region but
it is replaced by
cement
Cement
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Cement
Fibres from the cement pass into the jawbone
Fibre
to anchor the tooth
forming periodontal membrane
Periodontal membrane
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Crown
Neck
Root
Dentine
occupies a large part of the tooth
softer than enamel
contains strands of cytoplasm & is described as
living structures
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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
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Incisor
CaninePremolar
Molar
Types of teethTypes of teeth
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TypesTypes Incisor
LocationLocation At the front of the jaw
ShapeShape Chisel-shaped
FunctionFunction Biting & cutting
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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)
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TypesTypes
LocationLocation
ShapeShape
FunctionFunction
Premolar
At the side of the jaw
Broad top with ridges With two cusps
(projections)Crushing & grinding
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TypesTypes
LocationLocation
ShapeShape
FunctionFunction
Molar
At the back of the jaw
Broad top with ridges With four cusps
(projections)Crushing & grinding
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Wisdom teeth
Wisdom teeth
are the last molarsare the last molars
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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
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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
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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
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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
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i22
c11
pm22
m33
It shows the number & arrangement of the different types of teeth in a mammal
This presentation is called
dental formula
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i 22
c 11
m22
Milk teeth Dental formula
i 22
c 11
pm22 3
3m
Permanent teeth