power point by midhila

1. SUBMITTED BY
MIDHILA MADHU
REG NO: 13971020
SUBMITTED TO
LESHA .M.S
ASSISTANT PROFESSOR IN
NATURAL SCIENCE

3.  Teeth are small, calcified, hard, whitish
structures found in the mouth for
mechanically breaking down items of food
by cutting and crushing them.
 They are among the most distinctive
features of mammals.

4.  The three main parts are:
Crown
Neck
Root

5.  Part of the teeth above gum.
 Outermost covering of crown is
enamel.
 Enamel is the hardest material in the
body.

6.  Part of the teeth between crown and root.
 Inside the neck, a cavity is seen and it is the
pulp cavity.
 Blood vessels and nerve fibres are seen inside
the pulp cavity.
 Tissues of teeth get nourishment through
these blood vessels.

7.  Part of teeth seen inside the gum.
 Material that fixes teeth to the socket of jaw
bone is cement.

8.  Teeth is made of dentine.
 It is made up of living tissues.
 It is a hard calcium rich material.
 Less harder than enamel.
 It disintegrate easily.

10.  Four types of teeth.
 They are
a) Incisors
b) Canines
c) Premolars
d) Molars

11.  Flat crown.
 Single root.
 Helps in cutting and biting.

12.  Pointed crown.
 Single root.
 Helps in holding and tearing.

13.  Two ridges in crown.
 One or two roots.
 Helps in chewing and grinding.

14.  Two or three ridges in crown.
 Two or three roots.
 Helps in chewing and grinding.

15.  The number of teeth of each type is written
as a dental formula for one side of the
mouth, or quadrant, with the upper and lower
teeth shown on separate rows.
 In each set, incisors (I) are indicated first,
canines (C) second, premolars (P) third, and
finally molars (M), giving I:C:P:M.

16.  HUMANS - 2/2 :1/1 :2/2 :1/1
 LION - 3/3 :1/1 :3/2 :1/1
 COW - 0/3 :0/1 :3/3 :3/3
 CAT - 3/3 :1/1 :3/2 :1/1

17.  FOX - 3/3 :1/1 :4/4 :2/3
 PIG - 3/3 :1/1 :4/4 :3/3
 RABBIT - 2/1 :0/0 :3/2 :3/3
 RAT - 1/1 :0/0 :0/0 :3/3.

18.  Plaque
Plaque is a biofilm consisting of large quantities
of various bacteria that form on teeth. If not
removed regularly, plaque buildup can lead to
periodontal problems such as gingivitis.

19.  Streptococcus mutans is the most important
bacterium associated with dental caries.
 Certain bacteria in the mouth produce lactic
acid, which dissolves the calcium and
phosphorus in the enamel.This process,
known as"demineralisation", leads to tooth
destruction.

20.  Oral hygiene is the practice of keeping the
mouth clean and is a means of preventing
dental caries, gingivitis, periodontal disease,
bad breath and other dental disorders.
 Brush your teeth twice in a day.
 Regular dental check up is also recommended.

21.  A.R.Ten Cate(1998), Oral
histology:development, structure and
function, 5th edition, mosby year book
 Clemente(1987), Anatomy,a regional atlas of
the human body, ISBN 0-8067-0323-7
 Johnson nad Clarke(1998), Biology of human
dentition

22. THANK YOU