Difference Between Enamel And Cementum

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Difference Between Enamel And Cementum. In this article, you will learn about what is enamel, what is cementum, what is the main difference between enamel and cementum, and a comparison between enamel vs cementum.

Difference Between Enamel And Cementum:

Difference Between Enamel And Cementum - enamel vs cementum
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The main difference between enamel and cementum is very simple. The enamel is the hardest tissue of the body and the only ectodermal derivative of the tooth. It has 96% of organic constituents by weight. The enamel is mainly composed of hydroxyapatite crystals, which is actually calcium phosphate. On the other hand, cementum is very comparable to a bone. Its structure is also similar to the bone. The cementum is thickest at the apex and is thinner at its junction.

What Is Enamel?

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If we talk about the hardest tissue of the human body, the enamel will be at the top of the list. Enamel is a highly mineralized epithelial tissue of the body. Ameloblasts cells are responsible for their formation. It is the only tooth’s ectodermal derivative. Enamel does not have collagen as its organic constituents. There are 96% of inorganic constituents by weight, that is mainly hydroxyapatite crystals. Hydroxyapatite crystals are actually a form of calcium phosphate. These crystals are arranged like rods. Other hard tissue of the human body, like dentin, cementum and various bones also have hydroxyapatite crystals as their inorganic constituent.

Enamel has an avascular and acellular structure. It does not have the ability to repair or regenerate itself. There are various sizes and shapes of hydroxyapatite crystals. But, the hydroxyapatite crystals of the enamel are the longest and hexagonal in structure. They do not have any mature cells like cementum has cementocytes because they are lost with eruption.

What Is Cementum?

Difference Between Enamel And Cementum - What Is Cementum
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The cementum is the mineralized connective tissue of the human body. It consists of HAp minerals (65 wt%), organic matrix (23 wt%) and water (12 wt%). The cementum’s structure and composition are very similar to the bone. It is thinnest at the junction and the thickest at the apex.

Cementum is formed as a repair tissue. It forms throughout life and keeps the tooth functional. Cementum is formed by the cells called cementoblasts. The cementoblast lines and covers up the surface of the cementum. The most superficial layer of cementum is the uncalcified cementum. There are the cells that lie within the cementum. These are called cementocytes. They are enclosed in the lacuna and are involved in the canaliculi process, but in a less complex network. The cementocytes are very limited.

Main Difference Between Enamel And Cementum:

-Enamel is the hardest tissue.
-Cementum is similar to the bone.

-Enamel is a epithelial tissue.
-Cementum is a connective tissue.

-Formative cells of enamel are Ameloblasts.
-Formative cells of cementum are cementoblasts.

-Enamel does not have any mature cells.
-Cementum have mature cells called cementocytes.

featured image source: www.shorechildrensdentalcare.com

Also check: Difference Between Cilia And Flagella

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