Powerpoint presentation on teeth

power point by midhila

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

2. TOPIC : TEETH

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. INTRODUCTION

4. The three main parts are: Crown Neck Root STRUCTURE OF TEETH

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

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. NECK

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

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. What is teeth made of ???

9. CROSS SECTION OF TEETH

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

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

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

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

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

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. DENTAL FORMULA

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 EXAMPLES……

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. EXAMPLES……

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 . TOOTH DECAY

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. TOOTH CARE

21. A.R.Ten Cate (1998), Oral histology:development , structure and function, 5 th 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 REFERENCES

22. THANK YOU 