Oral Histology (Recap) Cementum

Cellular Cementum

After the formation of acellular cementum. A less mineralized cementum.

Chemical Composition of Cementum

Cementum from fully formed permanent teeth contains 45 to 50 % inorganic substances. 50 to 55% organic material and water. It has the highest fluoride content of all the mineralized tissues. Noncollagenous proteins important roles in matrix deposition.

Physical Characteristics of Cementum

The hardness of fully mineralized cementum is less than dentin. light yellow in color. Lighter color than dentin.

Dentin sialoprotein, fibronectin, tenascin, and prostaglandins

are present in cellular cementum

Salter

are seen in cementum during the process of cementogenesis

Hyaline Layer

as the odontoblasts retreat inwards, they do not leave behind the odontoblastic process

Intermediate Cementum

epitheliall cell rests may be entrapped in the cementum near cementodentinal junction

Cementum

is the mineralized dental tissue covering the anatomic roots of human teeth.

Acellular extrinsic fiber cementum

once the periodontal ligaments fibers get attached to the fibrous fringe.

Cementocytes

some cementoblasts get entrapped

Cementoblasts

synthesize collagen and protein polysacharides. Which make up the organic matrix of cementum

Acellular intrinsic fiber cementum

the attachment occurs only after the tooth has erupted into the oral cavity

Intrinsic Fibers of Celullar Cementum

the cementoblast secretes the collagen fibers and ground substance

Hertwig

the internal and external enamel epithelium proliferate downwards

Alkaline phosphatase

the mineralization of cementum matrix may be controlled by hydroxyapatite crystalls that is rich in

Osteopontin

which is present in cementum in lesser amounts than in bone, regulate mineralization.