Amelogenesis: Life Cycle of Ameloblasts

<p>Complete mineralization to 96% (C)</p> Signup and view all the answers

<p>From the height of the crown downward (B)</p> Signup and view all the answers

<p>They have large nuclei that almost fill the cell body. (D)</p> Signup and view all the answers

<p>Nuclei shift proximally towards the stratum intermedium. (C)</p> Signup and view all the answers

<p>Development of distal junctional complex. (C)</p> Signup and view all the answers

<p>It disintegrates to allow contact with dentin. (B)</p> Signup and view all the answers

<p>They are evenly distributed throughout the cytoplasm. (B)</p> Signup and view all the answers

<p>Differentiation stage (A)</p> Signup and view all the answers

<p>Distal junctional complex (B)</p> Signup and view all the answers

<p>Shift of nuclei towards the proximal end. (A)</p> Signup and view all the answers

<p>Secretory granules and small vesicles (A)</p> Signup and view all the answers

<p>Withdrawal of Tomes' processes (B)</p> Signup and view all the answers

<p>There's a difference in orientation and direction (C)</p> Signup and view all the answers

<p>Association with the removal of protein and water (C)</p> Signup and view all the answers

<p>Introduction of inorganic materials (B)</p> Signup and view all the answers

<p>Decrease in the volume of ameloblasts (B)</p> Signup and view all the answers

<p>Creating a serrated appearance on the enamel surface (C)</p> Signup and view all the answers

<p>Crystals are randomly arranged (C)</p> Signup and view all the answers

<p>To protect the mature enamel from connective tissue. (A)</p> Signup and view all the answers

<p>It may be absorbed or covered by cementum. (C)</p> Signup and view all the answers

<p>Matrix formation and mineralization. (D)</p> Signup and view all the answers

<p>In the rough endoplasmic reticulum (rER). (D)</p> Signup and view all the answers

<p>It prevents the tooth from erupting. (B)</p> Signup and view all the answers

<p>Providing attachment between ameloblasts and the enamel surface. (C)</p> Signup and view all the answers

<p>They occur simultaneously without clear distinction. (D)</p> Signup and view all the answers

<p>It induces atrophy of surrounding connective tissue. (C)</p> Signup and view all the answers

An extension of the ameloblast, containing secretory granules and small vesicles, embedded in a pit. It's crucial in enamel formation.

Enamel secretion happens in two key spots on the Tomes' process: proximal (inter rod) and distal ends (enamel rod).

The orientation of crystals in enamel differs between inter-rod (proximal) and rod (distal) regions, due to Tomes' process action.

A stage after initial enamel formation where ameloblasts retract, reducing size and organelle content.

A type of ameloblast associated with enamel maturation, removing water and protein.

A type of ameloblast involved in adding inorganic material to enamel, with microvilli.

The final stage of enamel formation where it becomes fully mineralized, usually after the occlusal/incisal areas.

A type of junction between ameloblasts that can be leaky or tight, changing during the stages of enamel formation.

Stage in enamel formation where ameloblasts produce a material, similar to basal lamina, to firmly attach enamel to the ameloblasts. This material also protects the enamel.

A protective layer of cells formed by ameloblasts, isolating the enamel from connective tissue until tooth eruption.

Stage in tooth development where REE induces connective tissue atrophy to allow tooth eruption without bleeding. REE degeneration can delay eruption

Process where enamel proteins are synthesized, modified, and secreted by ameloblasts.

The process of adding minerals to the enamel matrix.

Both occur almost simultaneously during enamel formation. Mineralization happens even before the matrix is fully formed.

Ameloblasts use a material like basal lamina to attach to and protect the enamel.

If connective tissue meets the enamel, the enamel might be resorbed or covered by cementum.

Ameloblasts move away from the dentin to create space for enamel matrix deposition.

Extensions of ameloblasts into enamel matrix, guiding enamel crystal orientation.

Mineralization happens as enamel is laid down, contributing about 25-30% of the final mineral content.

Mineralization continues to reach full density (96%) after the full thickness of a layer of enamel has been produced.

Mineralization starts from the crown (top) and moves toward the cervix (neck) of the tooth.

The structural changes in ameloblasts during enamel formation.

A stage in ameloblast development where they become specialized and non-dividing.

The ameloblast cells produce and secrete enamel matrix.

The ameloblast develops distinct cell ends (proximal & distal) specialized for enamel secretion.

The Golgi apparatus' role is crucial in packaging and delivering enamel proteins.

The initial arrangement of enamel crystals is random. Tomes' process influences it.

Ameloblasts move away from the dentin surface to make space for enamel.

Enamel proteins are secreted by ameloblasts to form the initial enamel matrix, and gradually mineralized.