DEH 103: Histology & Embryology

Enamel is the hardest mineralized surface in the body becasue it is ___% mineralized.

The 96% inoragnic mineral consists of? The 4% organic matrix and water consits of?

What is the range of thickeness of enamel?

Enamel is formed by ___ rods that extend from the surface to the DEJ.

When enamel rods are interwined at the cusp tip.

These are alternating light and dark bands that extend perpendicular from the DEJ.

These are narrow brownish lines that enxtend diagonally outward from the DEJ toward teh occlusla/incisal part of the crown.

This is a noteable line of Rezius that is formed at birth. It is due to environmental and nutrition changes.

These are cracks in the enamel surface visible to the eye that extend inward toward the DEJ. They can be casued by faults in enamel matrix or injury.

These are microscopic defects that look like small brancehs attached to the DEJ and extend toward the surface of the enamel.

These are extensions of dentinal tubules into the enamel past the CEJ.

These are fine horizontal lines resulting from the termination of the Striae of Retzius.

This is a band of ename that is noted on decidousus teeth and on permenent teeth near the CEJ. The enamel rods are nearly perpendiculat to the surface.

These are teh natural spaces between rod crystals.

The dentin makes up the bulk of the tooth what is it composed of?

What are the 3 classifications of dentin?

This is the mature pre-dentin.

This direclty underlies the mantle dentin.

This is dentin found in some ares of most older teeth that is 2nd to trauma.

What is the layers of dentin around the dentinal tubules.

These lines transverse the dnetinal tubules. They are the growth lines of dentin.

This is a bnd of unmineralized sponts immediatly beneath the cemtnum cover the root.

In enamel a renewable source?

Name 4 clinical sines of enamel wear and their etiology cause.

What is the organic substance in enamel.

What cells produce enamel?

Where on a tooth is enamel the thickest / thinnest?

Where does enamel formation first begin?

How many ameloblasts make up an enamel rod?

What is the name of the rod surface and rod center?

What helps make enamel resistant to fracture?

What is enamel at the cusp tips called?

What are the light and dark bands that result becasue of light transmission?

What are growth lines in enamel called?

What is tehl ine of Retzius that is formed at birth?

What is the visible crack in enamel called?

What is the defect that forms when the dentinal tubule extends past the DEJ?

What is the enamel defect that passes through 1/5th of the enamel and looks like a tree limb?

What are the external enamel lines taht form due to termination of imbrication lines?

Where can prismless enamel be found on a tooth?