How are Cementocytes formed?

Cementum is a mineralized tissue covering the tooth root that functions in tooth attachment and posteruptive adjustment of tooth position. During formation of the apically located cellular cementum, some cementoblasts become embedded in the cementoid matrix and become cementocytes.

What are cementoblasts derived from?

A cementoblast is a biological cell that forms from the follicular cells around the root of a tooth, and whose biological function is cementogenesis, which is the formation of cementum (hard tissue that covers the tooth root).

Where are Cementocytes located?

Cementocytes are somewhat akin to the osteocytes of bone and are found in lacunae, but have cell processes which are located in canaliculi radiating to the external PDL surface of the tissue.

What is cellular cementum?

Cellular cementum contains cells and is the medium of attachment of collagen fibres to the alveolar bone. It is also responsible for minor repair of any resorption by continued deposition to keep the attachment apparatus intact. Acellular cementum does not contain cells and has a main purpose of adaptive function.

What is the function of circumferential fibers?

Circumferential fibres encircle the neck of each tooth to form a band within the marginal gingiva. Transseptal fibres run from the cementum of one tooth and insert into that of the adjacent tooth by crossing the interdental septum [23].

How is cellular cementum formed?

Formation of the matrix for cellular cementum appears to be induced by exposure of the inner layer of the epithelial root sheath to the mesenchymal cells in the dental follicle.

What is cementum resorption?

Resorption is the term for a common type of dental injury or irritation that causes a loss of a part or parts of a tooth. Resorption can affect many parts of a tooth, including: interior pulp. cementum, which covers the root. dentin, which is the second-hardest tissue underneath enamel.

Is cementum harder than bone?

Cementum: Cementum is the thin layer of calcified or mineralized tissue covering the root of the tooth and sits inside the gum socket. Cementum is harder than bone but softer than the enamel or dentin.

What are the fibers of the cementum matrix made of?

The collagen fibers of the cementum matrix originate primarily as principal fibers of the PDL produced by fibroblasts (extrinsic fibers). These fibers are oriented more or less perpendicularly to the cementum surface. The ground substance embedding these fibers is laid down by cementoblasts.

What is the cement matrix in concrete?

The cement matrix is formed during the hydration process and binds the aggregates together. The cement fraction, about 300 kg/m3 concrete, is limited but dominates most concrete properties. Cement is produced in many varieties, but the most common is Portland cement (and its modified versions).

What is the difference between acellular and cellular fiber cementum?

Acellular, extrinsic fiber cementum (cervical portion of radicular cementum on human teeth) Has a well defined matrix of densely packed fibers (Sharpey’s fibers) that originated as principal fibers of the PDL. Contains no cells . Cellular, mixed fiber cementum.

What is the cytoplasmic structure of cementocytes?

THESE CELL PROCESSES BRANCH AND ANASTOMOSE WITH THEIR NEIGHBOURING CELL. The cytoplasm of Cementocytes in deeper layer of cementum contains few organelles, er dilated ,mitochondria sparse these indicates cc are degenerating or are marginally active cells.60 um signd of dege such as cytoplasmic clumping and vesiculation.

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