2. is the hard dental tissue covering the anatomic roots
of teeth and is formed by cells known as
cementoblasts, which develop from
undifferentiated mesenchymal cells in the
connective tissue of the dental follicle.

4. Organicmaterial Inorganicmaterial
+
Water
45% to 50%
(hydroxyapatite)
* Fluride content is
highest than other
calcified tissue of body
.
50% to 55%
mainly
90%is type 1 collagen
And ground substance
consist of
proteoglycans .
(matrix)

5. Acellular Cellular
Primary Cementum Secondary Cementum
Location: Cervical margin to 2/3rd of Apical 3rd and inter-radicular region.
root.
Formation: Forms before the tooth Forms after tooth reaches occlusal plane.
reaches occlusal plane.
Cells: No Cellular, contains cementocytes
Structure: Thin and regular. Thick and irregular.
Calcification: More calcified Less calcified.
Rate of development : slow Fast .
Sharpey’s fiber are main compenent . Sharpey’s fibers occupy smaller portion

6. Irregular CC & regular
AC

7. After
formation of
dentin
Fragmentation
of the epithelial
root sheath .
induce activity of
mesenchymal cells of
dental follicle.
Continuous loss
of epithelial root
sheath .
Allow adjacent cells of the
investing layer of the
dental follicle to come to
lie on surface of root
dentin
Cells are induced
to differentiate
into
cementoblasts.
Increased in
size
Depositing the organic matrix
of cementum
( intrinsic fibers + ground
substance )
Cells trapped in
lacunae within
matrix formed
( secondary
cementum )

14. Aceullar Afibrillar: Contains no cells, no fibers.
Only mineralized ground substance present.
Produced by Cementoblasts and found in coronal
cementum.
Aceullar Extrinsic Fiber: Contains Sharpey’s
fibers but no cells.
Produced by Fibroblasts and Cementoblasts.
Found commonly in cervical 3rd of roots but may
extend apically.

16. Cellular Intrinsic Fiber: Cells but no
extrinsic fibers. Produced by Cementoblasts
and fills resorption lacunae.
Cellular Mixed Stratified: Extrinsic and
intrinsic fibers (hence mixed) and has cells.
Co-product of Cementoblasts & Fibroblasts.
In apical 3rd of toot and in furcation.

18. *Cellular and aceullar cementum are
separated by lines that are parallel to the long
axis of the root.
*More mineralized than adjacent cementum.
*They represent rest periods in cementum
formation.

19. SMOOTH In permanent teeth.
ESCALLOPD In deciduous teeth.