cementum and its significance in periodontology and in maintaining vitality of tooth.

1. cementum

3. The Peridontium provides the support necessary to
maintain teeth in function ,consist of four principle
components:
-GINGIVA
-PERIODONTAL LIGAMENT
-CEMENTUM
-ALVEOLAR BONE

4. CEMENTUM
Cementum is the calcified,
avascular mesenchymal tissue
that forms to outer covering of
the anatomic root.

5. -It begins at the cervical portion
of the tooth at the cemento-
enamel junction (CEJ) and
continues to the apex.
-Cementum furnishes a
medium for the attachment of
collagen fibers that bind the
tooth to surrounding structures.

8. Classification:
1)Based on Presence or Absence of Cells:-
-Acellular Cementum(primary)
-Cellular Cemuntum (secondary)
2)Based on Fibers:-
-Extrinsic
-Intrinsic
3)According to above findings cementum classified as:-
-Acellular Afibrilar Cementum
-Acellular Extrinsic Fiber Cementum
-Cellular Mixed Stratified Cementum
-Cellular Intrinsic Fiber Cementum

9. INTERMEDIATE CEMENTUM
•It is a thin ,amorphous layer of hard tissue
approximately 10 micron thick.
•Frequently seen in the apical two third of the roots
of posterior teeth .
•Rarely seen in incisors or primary teeth.
•This type of cementum does not exhibit the
characteristics features of either dentin or
cementum ,while regard to its location, it is found
intermediate between cementum and dentin.

12. (A)

13. Cellular Cementum(CC) Acellular Cementum(AC)

31. ENAMEL DROP