Dentine sheet part 1

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

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

<p>Dentin crystals don't stack with each other. (A)</p> Signup and view all the answers

<p>Dentin crystals lack rod formation. (C)</p> Signup and view all the answers

<p>Dentin crystals do not stack together like enamel hydroxyapatite. (D)</p> Signup and view all the answers

<p>Enamel hydroxyapatite forms rods. (D)</p> Signup and view all the answers

<p>Dentin crystals do not align in a stacked manner. (A)</p> Signup and view all the answers

<p>2.5um (A)</p> Signup and view all the answers

<p>They occupy a smaller area (D)</p> Signup and view all the answers

<p>1um (D)</p> Signup and view all the answers

<p>They become closer together (D)</p> Signup and view all the answers

<p>The retreat of the odontoblasts (A)</p> Signup and view all the answers

<p>A curved S shape (D)</p> Signup and view all the answers

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

<p>It forms a curved S shape (D)</p> Signup and view all the answers

<p>Primary curvature (B)</p> Signup and view all the answers

<p>The curved S shape of the tubules (C)</p> Signup and view all the answers

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

<p>Osteocalcin (B)</p> Signup and view all the answers

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

<p>It is an acidic protein (A)</p> Signup and view all the answers

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

<p>Chondroitin 4-sulphate (C)</p> Signup and view all the answers

<p>Chondroitin 4-sulphate and chondroitin 6-sulphate (B)</p> Signup and view all the answers

<p>Chondroitin 6-sulphate (B)</p> Signup and view all the answers

<p>Heparan sulfate (B)</p> Signup and view all the answers

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

<p>5-12% (B)</p> Signup and view all the answers

<p>Type III collagen (C)</p> Signup and view all the answers

<p>Less organic matrix (B)</p> Signup and view all the answers

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

<p>To facilitate mineralization (C)</p> Signup and view all the answers

<p>It is the most acidic protein known (B)</p> Signup and view all the answers

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

<p>By promoting mineralization (B)</p> Signup and view all the answers

<p>Its involvement in dentine formation (A)</p> Signup and view all the answers

<p>Near the dentinoenamel junction (C)</p> Signup and view all the answers

<p>Near the mineralising front (A)</p> Signup and view all the answers

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

<p>Keratohyalin (B)</p> Signup and view all the answers

<p>Higher mineral content (A)</p> Signup and view all the answers

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

<p>Regulating mineralization (B)</p> Signup and view all the answers

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

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

<p>Binding to integrins (D)</p> Signup and view all the answers

<p>Size (B)</p> Signup and view all the answers

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

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

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

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

<p>Not specified in the given text (D)</p> Signup and view all the answers

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

<p>Heparan sulphate (B)</p> Signup and view all the answers

<p>Not specified in the given text (B)</p> Signup and view all the answers

<p>They fill with water and appear opaque (B)</p> Signup and view all the answers

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

<p>Its ability to bind calcium (A)</p> Signup and view all the answers

<p>Dermatan sulfate, regulating collagen fibril assembly (D)</p> Signup and view all the answers

<p>Collagen type I (C)</p> Signup and view all the answers

<p>Its lower organic content (C)</p> Signup and view all the answers

<p>An increased rate of formation of peritubular dentine due to higher mineralization (C)</p> Signup and view all the answers

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

<p>An increased deposition of peritubular dentine around the odontoblastic processes (B)</p> Signup and view all the answers

<p>It enhances the overall strength of dentine in the DEJ region (A)</p> Signup and view all the answers

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

<p>They act as a template for crystal nucleation. (B)</p> Signup and view all the answers

<p>Dentin crystals are smaller and less ordered, making them more susceptible to acid dissolution. (D)</p> Signup and view all the answers

<p>Phosphophoryn promotes the formation of dentin crystals, contributing to dentine stiffness. (C)</p> Signup and view all the answers

<p>They provide flexibility and resilience to dentine. (A)</p> Signup and view all the answers

<p>The curvature enhances dentine's ability to distribute stress evenly. (C)</p> Signup and view all the answers

Dentine found at the walls of newly formed dentinal tubules at the pulp surface, primarily located in the mantle dentine.

Dentine found within the dentinal tubules, specifically in the pulp surface.

The first layer of dentine formed, characterized by the presence of peritubular dentine.

Dentin crystals are significantly smaller than enamel hydroxyapatite due to their lack of rod formation, resulting in smaller, less organized structures.

Dentin crystals are not stacked like enamel hydroxyapatite. Instead, they are arranged randomly, contributing to its lower mineral density.

The dentinal tubules are larger at the pulp end, measuring approximately 2.5 um.

The dentinal tubules are narrower at the DEJ, measuring approximately 1 um.

The distance between tubules decreases as the odontoblasts retreat inwards, resulting in a denser arrangement closer to the DEJ.

Dentinal tubules have a curved, 'S' shape, known as the primary curvature.

The characteristic curved, 'S' shape of the dentinal tubules.

Dentine contains various glycoproteins and sialoproteins, including dentine sialoprotein (DSP), osteonectin, and phosphophoryn.

Osteocalcin is NOT found in dentine. It is primarily associated with bone tissue.

Acidic proteins in dentine play a crucial role in cell signaling and regulation of mineralization during tooth development.

Dentine sialoprotein (DSP) is an acidic protein involved in cell signaling and mineralization processes.

Osteonectin, a protein also found in bones, participates in collagen fibril organization and mineral deposition in dentine.

Chondroitin 4-sulphate and chondroitin 6-sulphate are the primary glycosaminoglycans in dentine, along with smaller amounts of others.

Dermatan sulfate is specifically mentioned as a glycosaminoglycan found in dentine, although not as prevalent as others.

Dentin is more heavily mineralized than the inter-tubular dentine due to its lower organic matrix content, resulting in greater resilience.

Phosphophoryn, the most acidic protein known, plays a crucial role in facilitating mineralization in dentine.

Phosphophoryn is highly acidic, a distinctive characteristic compared to other proteins in dentine.

Odontoblastic processes are highly concentrated near the dentinoenamel junction (DEJ), contributing to the high density of tubules in this region.

Intratubular dentine is primarily located near the mineralising front, the area where new dentine is formed.

Dentin crystals are hexagonal in shape, differing from the rod-like structure of enamel hydroxyapatite.

The SIBLING family of proteins includes DSP, osteonectin, and phosphophoryn. These proteins play crucial roles in bone and dentine formation.

Acidic proteins in dentine act as key regulators of mineralization, influencing the deposition of mineral crystals.

Chondroitin sulfate, a type of glycosaminoglycan, is a primary component of dentine, contributing to its structure and flexibility.

Osteopontin, a protein also found in bone, plays a role in cell adhesion, signaling, and mineral deposition in dentine.

Dentine sialoprotein (DSP) binds to integrins, proteins involved in cell adhesion, contributing to tooth structure and development.

The primary difference between crystals in enamel and those in dentine is their size. Enamel crystals are larger and more organized, while dentin crystals are smaller and more randomly arranged.