Cementum and composition of cementum slideshare ppt

Cementum

It is hard, avascular connective tissue which covers that covers the roots of teeth. 

Development of cementum

It is divided into two stages

1. Prefunctional stage

It occurs throughout root formation.

2. Functional stage

It starts when the tooth is in occlusion and continues throughout life. 

Composition of cementum

Cementum consists of both inorganic and organic components

Inorganic component

Cementum consists of 45-50% hydroxyapatite crystal by weight.

Organic Component

It consists of collagen and non-collagenous matrix protein

• Collagen type I forms 90% of organic constituents in cellular cementum. 
• Collagen type III and XII and a trace amount of collagen type V, VI, and XIV are also found in cementum.
• Non-collagenous matrix protein consists of alkaline phosphatase, bone sialoprotein, dentin matrix protein 1, dentin sialoprotein, fibronectin, osteocalcin, osteonectin, and several growth factors.

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