STRUCTURE OF HUMAN TOOTH:
Each tooth consists of three parts:
- Crown.
- Neck.
- Root.
CROWN:
Crown is the part of tooth projected above the gum level. It is the biting and chewing part surface of the tooth.
-Enamel:
The outer surface of crown is covered by a very hard white substance called the enamel. It is non-living and protects teeth besides giving lustrous appearance to tooth.NECK:
Neck is the part surrounded by gum.
ROOTS:
Root is the part embedded in bone. The parts of root are:-Pulp cavity: Inside the dentine, there is a cavity known as pulp cavity. It is filled by soft connective tissues called pulp. It also contains nerves and blood vessels that supply the growing tooth with food and oxygen.
-Cement: The root of each tooth is covered with another hard material called cement.
PERIODONTAL MEMBRANE:
The tough fiber of periodontal membrane is attached with the cement to the jaw bone so that each tooth is fixed firmly in socket.
TYPES OF HUMAN TEETH:
According to the shape and function following type of teethes are present in our oral cavity:-INCISORS. -CANINES. -PREMOLARS. -MOLARS.
INCISORS:
The flat chisel-shaped teeth present in front of oral cavity are incisors. They are eight in numbers, four in upper jaws and four in lower jaws. They are used in cutting. CANINES:
Beside incisors lie canines in each side in both jaws. They are four in number and are pointed. They are used for tearing and pulling flesh. They are very long and prominent in carnivores such as loin. Herbivore animals usually do not have canines.