Untitled Quiz

<p>Dentin formed by improperly differentiated odontoblasts (D)</p> Signup and view all the answers

<p>Determining the morphological form and shape of the tooth (D)</p> Signup and view all the answers

<p>It disrupts the differentiation of ameloblasts (D)</p> Signup and view all the answers

<p>Mesiodens (C)</p> Signup and view all the answers

<p>In the bell stage of histodifferentiation (D)</p> Signup and view all the answers

<p>The growth of enamel on teeth (D)</p> Signup and view all the answers

<p>Advanced bell stage (D)</p> Signup and view all the answers

<p>Noncollagenous proteins (C)</p> Signup and view all the answers

<p>Regulate the growth and thickness of enamel (C)</p> Signup and view all the answers

<p>Secretion of matrix proteins by ameloblasts (A)</p> Signup and view all the answers

<p>To initiate crystal formation in preformed organic matrix (B)</p> Signup and view all the answers

<p>To act as a shock absorber and protect enamel-forming cells (D)</p> Signup and view all the answers

<p>Primary enamel knot (D)</p> Signup and view all the answers

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

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

<p>By the regulation of amelogenins (D)</p> Signup and view all the answers

<p>To regulate the formation of enamel (C)</p> Signup and view all the answers

<p>It collapses to provide nutrition (A)</p> Signup and view all the answers

<p>Columnar cells (C)</p> Signup and view all the answers

<p>Star-shaped (B)</p> Signup and view all the answers

<p>It appears more condensed and fibrous (A)</p> Signup and view all the answers

<p>Third and fourth pharyngeal arches (D)</p> Signup and view all the answers

<p>Covers and protects underlying tissues (B)</p> Signup and view all the answers

<p>18 weeks (D)</p> Signup and view all the answers

<p>2.6 mm (A)</p> Signup and view all the answers

<p>Line of fusion between anterior and posterior thirds (D)</p> Signup and view all the answers

<p>Underlying dentin color (B)</p> Signup and view all the answers

<p>Hardest calcified tissue (D)</p> Signup and view all the answers

<p>Mineral salts (C)</p> Signup and view all the answers

<p>Supernumerary cusp formation (C)</p> Signup and view all the answers

<p>Deposition of the matrix of dental hard tissues (D)</p> Signup and view all the answers

<p>Hypoplasia (D)</p> Signup and view all the answers

<p>Nasal cavities (D)</p> Signup and view all the answers

<p>Problems with calcification or mineralization (A)</p> Signup and view all the answers

<p>First branchial arch (B)</p> Signup and view all the answers

<p>Morphology of the tooth crown or root (C)</p> Signup and view all the answers

<p>4th week (C)</p> Signup and view all the answers

<p>At the cementoenamel junction (A)</p> Signup and view all the answers

<p>Contains mineralized ground substance and no cells or fibers (A)</p> Signup and view all the answers

<p>Cellular mixed stratified cementum (A)</p> Signup and view all the answers

<p>To indicate mineralized areas with less collagen (B)</p> Signup and view all the answers

<p>Cementum overlaps enamel (B)</p> Signup and view all the answers

<p>Cellular intrinsic fiber cementum (D)</p> Signup and view all the answers

<p>It is avascular and lacks blood supply (A)</p> Signup and view all the answers

<p>Is composed mostly of Sharpey's fibers (D)</p> Signup and view all the answers

Star-shaped, branching network of cells found in the enamel organ's center; acts as a shock absorber protecting enamel-forming cells.

Knob-like structure on the inner surface of the enamel organ; a key area directing enamel formation.

Vertical extension of the primary enamel knot, positioned centrally in the enamel organ.

Tall columnar cells that differentiate from inner enamel epithelium to form enamel.

Layer between inner and stellate reticulum in the enamel organ, aiding enamel formation.

Single layer of columnar cells that develop into ameloblasts and form enamel.

Cuboidal cells forming the outermost layer of the enamel organ, initially smooth.

Substances synthesized by cells in the center of the enamel organ, absorbing water and causing stretching of intercellular bridges in the stellate reticulum.

Extra teeth that form due to abnormal tooth initiation.

A common type of supernumerary tooth located between the upper central incisors.

Increase in the number of tooth cells to form the tooth crown's size and shape.

The process where cells change their structure and function to create specific tooth tissues (e.g. enamel, dentin).

Cells that create dentin, the hard tissue of the tooth.

Inner enamel epithelium influencing dental papilla cells and vice versa, leading to proper tooth development.

Dentin formed due to abnormal odontoblast differentiation, often caused by vitamin deficiency.

The stage of tooth development where the basic shape of the tooth is established. It's influenced by the interaction and differentiation of cells in the enamel organ and dental papilla.

An extra cusp on a tooth, caused by disturbances in morphodifferentiation during crown formation. This can lead to an unusual shape or number of cusps.

A thin, pointed tooth caused by disturbances in morphodifferentiation during crown formation. It usually happens when the crown doesn't develop properly.

An abnormal bend or curve in the root of a tooth, often caused by trauma during tooth development.

The process of adding layers of mineralized tissue to create the final shape of a tooth. It involves the deposition of enamel and dentin in a rhythmic pattern.

A disturbance in the formation of the enamel matrix of a tooth, leading to an incomplete or thinner enamel layer.

A disturbance in the mineralization process of the enamel matrix, resulting in a weaker, more porous enamel.

Similar to hypocalcification, a disturbance in the mineralization process of the enamel matrix, leaving the enamel weaker and more prone to decay.

The back portion of the tongue, formed by the merging of the 3rd and 4th pharyngeal arches during development. It overgrows the 2nd arch, forming the back of the tongue.

A groove on the tongue's surface that marks the boundary between the anterior 2/3 (formed by the 1st arch) and the posterior 1/3 (formed by the 3rd and 4th arches).

Enamel is the hard, outer layer of the tooth crown, providing protection. It's formed by ectoderm and begins development around 18 weeks of embryo age.

Enamel is incredibly hard, primarily due to its high mineral content and crystalline structure. It's vital for resisting the forces of chewing.

Enamel thickness varies: thickest on the biting surfaces (cusps/incisal edge) and thinnest at the tooth's neck, grooves, or pits.

Enamel is normally translucent, allowing the yellow dentin underneath to show through. Greyish enamel means it's more opaque. Yellow teeth often have thinner, translucent enamel.

Enamel is the hardest tissue in the human body, even harder than bone. This is due to its densely packed mineral structure.

Enamel is about 96% mineral content, primarily hydroxyapatite crystals, and only about 4% organic material. This high mineral content explains its strength.

Fluoride ions replace some of the hydroxyl ions in the hydroxyapatite structure of tooth enamel, making it more resistant to acid attacks.

The main mineral component of tooth enamel, providing its hardness and resistance.

The process of forming enamel on teeth; starts during the advanced bell stage of tooth development, after dentin formation.

The process of enamel formation occurs in two phases: the secretory phase, where the organic matrix is laid down, and the maturative phase, where enamel crystals mature and harden.

The organic matrix of enamel is composed of noncollagenous proteins, mainly amelogenins and nonamelogenins.

Major enamel proteins that regulate enamel growth and thickness, making up about 90% of the enamel protein matrix.

A group of smaller enamel proteins, including enamelin, amelin, sheathlin, and tuftelin, that play a role in enamel structure and function.

Cementum is thinnest at the cementoenamel junction (where enamel and cementum meet) and thickest towards the root's tip (apex).

These are cells embedded in cementum, but they are either inactive or in a state of degeneration.

This type of cementum lacks cells and collagen fibers, only containing mineralized ground substance. It's found in the crown area of the tooth.

Mostly made up of Sharpey's fibers, which are dense bundles of collagen fibers embedded in cementum. It's located in the cervical third of the root.

This type of cementum contains both extrinsic and intrinsic collagen fibers and cells. It's found in the apical third of roots, at the furcations, and the root tip.

This type of cementum has cells but no extrinsic (outside) fibers. It's produced by cementoblasts and fills in spaces left by resorption.

Highly mineralized areas in cementum with a lower amount of collagen and a greater amount of ground substance. They represent periods of rapid cementum growth.

The area where dentin meets cementum. It's smooth in permanent teeth and scalloped in deciduous teeth. A layer called intermediate cementum is located between them.