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Questions and Answers
Where can peritubular or intratubular dentine be found?
Where can peritubular or intratubular dentine be found?
- On the enamel surface
- Within the pulp chamber
- At the walls of newly formed dentinal tubules at the pulp surface (correct)
- At the root apex
What is the primary location of intratubular dentine?
What is the primary location of intratubular dentine?
- Dentin-enamel junction
- At the cementoenamel junction
- Pulp-dentin junction
- Pulp surface (correct)
Where is peritubular dentine predominantly present?
Where is peritubular dentine predominantly present?
- At the pulp surface (correct)
- At the dentin-enamel junction
- Along the root canal wall
- In the enamel layer
Which type of dentine is situated specifically at the walls of newly formed dentinal tubules?
Which type of dentine is situated specifically at the walls of newly formed dentinal tubules?
In which area do we find newly formed dentinal tubules?
In which area do we find newly formed dentinal tubules?
Why are dentin crystals much smaller than enamel hydroxyapatite?
Why are dentin crystals much smaller than enamel hydroxyapatite?
What distinguishes the size of dentin crystals from enamel hydroxyapatite?
What distinguishes the size of dentin crystals from enamel hydroxyapatite?
How does the arrangement of dentin crystals differ from enamel hydroxyapatite?
How does the arrangement of dentin crystals differ from enamel hydroxyapatite?
What property of enamel hydroxyapatite contributes to its larger size compared to dentin crystals?
What property of enamel hydroxyapatite contributes to its larger size compared to dentin crystals?
In what way do dentin crystals differ structurally from enamel hydroxyapatite?
In what way do dentin crystals differ structurally from enamel hydroxyapatite?
What is the diameter of the tubules at the pulpal end?
What is the diameter of the tubules at the pulpal end?
What happens to the odontoblasts as they retreat inwards?
What happens to the odontoblasts as they retreat inwards?
What is the diameter of the tubules at the DEJ?
What is the diameter of the tubules at the DEJ?
What happens to the tubules as the odontoblasts retreat inwards?
What happens to the tubules as the odontoblasts retreat inwards?
What is the main factor affecting the distance between the tubules?
What is the main factor affecting the distance between the tubules?
What shape do the tubules form?
What shape do the tubules form?
What is the term for the curved S shape of the tubules?
What is the term for the curved S shape of the tubules?
What is the role of the primary curvature?
What is the role of the primary curvature?
What is the term used to describe the curvature of the tubules?
What is the term used to describe the curvature of the tubules?
What is the primary curvature a characteristic of?
What is the primary curvature a characteristic of?
What type of proteins are found in dentine?
What type of proteins are found in dentine?
Which of the following proteins is NOT found in dentine?
Which of the following proteins is NOT found in dentine?
What is the function of the acidic proteins found in dentine?
What is the function of the acidic proteins found in dentine?
Which of the following is a characteristic of dentine sialoprotein?
Which of the following is a characteristic of dentine sialoprotein?
Which of the following proteins is also found in bones?
Which of the following proteins is also found in bones?
Which glycosaminoglycan is listed as one of the main ones?
Which glycosaminoglycan is listed as one of the main ones?
What are the primary glycosaminoglycans found in dentine?
What are the primary glycosaminoglycans found in dentine?
Which glycosaminoglycan mentioned is NOT one of the primary ones in dentine?
Which glycosaminoglycan mentioned is NOT one of the primary ones in dentine?
What is a common glycosaminoglycan found in dentine that is NOT listed in the text?
What is a common glycosaminoglycan found in dentine that is NOT listed in the text?
Of the following options, which glycosaminoglycan is specifically mentioned as an 'imp'?
Of the following options, which glycosaminoglycan is specifically mentioned as an 'imp'?
What is the mineralization percentage of type I collagen in dentin compared to inter-tubular dentine?
What is the mineralization percentage of type I collagen in dentin compared to inter-tubular dentine?
Which type of collagen is primarily found in dentin?
Which type of collagen is primarily found in dentin?
What is the primary reason for dentin being more mineralized than inter-tubular dentine?
What is the primary reason for dentin being more mineralized than inter-tubular dentine?
In what way does the mineralization level of dentin impact its structural properties?
In what way does the mineralization level of dentin impact its structural properties?
What is the main role of Phosphophoryn in dentine?
What is the main role of Phosphophoryn in dentine?
Which of the following is a characteristic of Phosphophoryn?
Which of the following is a characteristic of Phosphophoryn?
What distinguishes Phosphophoryn from other proteins in dentine?
What distinguishes Phosphophoryn from other proteins in dentine?
How does Phosphophoryn contribute to the properties of dentine?
How does Phosphophoryn contribute to the properties of dentine?
What makes Phosphophoryn significant in the study of dentine?
What makes Phosphophoryn significant in the study of dentine?
Where are odontoblastic processes most heavily concentrated in the dentine?
Where are odontoblastic processes most heavily concentrated in the dentine?
What is the primary location of intratubular dentine?
What is the primary location of intratubular dentine?
What is a distinctive feature of dentin crystals compared to enamel hydroxyapatite?
What is a distinctive feature of dentin crystals compared to enamel hydroxyapatite?
Which type of proteins are primarily found in dentine?
Which type of proteins are primarily found in dentine?
What property contributes to the larger size of enamel hydroxyapatite compared to dentin crystals?
What property contributes to the larger size of enamel hydroxyapatite compared to dentin crystals?
Which of the following is NOT a member of the SIBLING family?
Which of the following is NOT a member of the SIBLING family?
What is the primary function of the acidic proteins found in dentine?
What is the primary function of the acidic proteins found in dentine?
Which of the following glycosaminoglycans is listed as one of the main ones in dentine?
Which of the following glycosaminoglycans is listed as one of the main ones in dentine?
Which of the following proteins is also found in bones?
Which of the following proteins is also found in bones?
Which of the following is a characteristic of dentine sialoprotein?
Which of the following is a characteristic of dentine sialoprotein?
What is the primary difference between crystals in enamel and those in dentine?
What is the primary difference between crystals in enamel and those in dentine?
Which component makes up approximately 20% of the organic composition in dentine?
Which component makes up approximately 20% of the organic composition in dentine?
Where is peritubular dentine predominantly located?
Where is peritubular dentine predominantly located?
What is the distinctive feature of dentin crystals compared to enamel hydroxyapatite?
What is the distinctive feature of dentin crystals compared to enamel hydroxyapatite?
What type of proteins are primarily present in dentine?
What type of proteins are primarily present in dentine?
What is the refractive index of water in relation to dentine in the described process?
What is the refractive index of water in relation to dentine in the described process?
Which protein, mentioned in the text, is NOT also found in bones?
Which protein, mentioned in the text, is NOT also found in bones?
Which glycosaminoglycan is mentioned as an 'imp' in dentine?
Which glycosaminoglycan is mentioned as an 'imp' in dentine?
What is the percentage of mineralization of type I collagen in dentin compared to inter-tubular dentine?
What is the percentage of mineralization of type I collagen in dentin compared to inter-tubular dentine?
What happens to the regions with patent tubules when a ground section of a root is placed in water?
What happens to the regions with patent tubules when a ground section of a root is placed in water?
Which protein is primarily found in intratubular dentine and differs from phosphophoryn?
Which protein is primarily found in intratubular dentine and differs from phosphophoryn?
Which characteristic of dentine sialoprotein contributes to the unique structural properties of dentine?
Which characteristic of dentine sialoprotein contributes to the unique structural properties of dentine?
Which glycosaminoglycan is mentioned as an 'imp' in dentine and what is its role?
Which glycosaminoglycan is mentioned as an 'imp' in dentine and what is its role?
Which protein found in dentine also plays a role in bone mineralization?
Which protein found in dentine also plays a role in bone mineralization?
Which characteristic of enamel hydroxyapatite contributes to its larger size compared to dentin crystals?
Which characteristic of enamel hydroxyapatite contributes to its larger size compared to dentin crystals?
Which of the following mechanisms is likely responsible for the presence of more peritubular dentine at the DEJ?
Which of the following mechanisms is likely responsible for the presence of more peritubular dentine at the DEJ?
Which protein is most likely responsible for the smaller size of odontoblastic processes at the DEJ?
Which protein is most likely responsible for the smaller size of odontoblastic processes at the DEJ?
Which of the following mechanisms could explain the smaller diameter of tubules at the DEJ?
Which of the following mechanisms could explain the smaller diameter of tubules at the DEJ?
What is the significance of the smaller odontoblastic processes at the DEJ for the overall properties of dentine?
What is the significance of the smaller odontoblastic processes at the DEJ for the overall properties of dentine?
Which glycosaminoglycan is NOT likely to be involved in the regulation of mineralization at the DEJ, given the properties of this region?
Which glycosaminoglycan is NOT likely to be involved in the regulation of mineralization at the DEJ, given the properties of this region?
What is the specific role of phospholipids in the formation and growth of dentine crystals?
What is the specific role of phospholipids in the formation and growth of dentine crystals?
How do the structural differences between dentin crystals and enamel hydroxyapatite impact their properties?
How do the structural differences between dentin crystals and enamel hydroxyapatite impact their properties?
What is the significance of Phosphophoryn in dentine mineralization and its structural properties?
What is the significance of Phosphophoryn in dentine mineralization and its structural properties?
How do the glycosaminoglycans found in dentine impact its structural and functional properties?
How do the glycosaminoglycans found in dentine impact its structural and functional properties?
What is the impact of the primary curvature of the tubules on the structural properties of dentine?
What is the impact of the primary curvature of the tubules on the structural properties of dentine?
Flashcards
Peritubular Dentine
Peritubular Dentine
Dentine found at the walls of newly formed dentinal tubules at the pulp surface, primarily located in the mantle dentine.
Intratubular Dentine
Intratubular Dentine
Dentine found within the dentinal tubules, specifically in the pulp surface.
Mantle Dentine
Mantle Dentine
The first layer of dentine formed, characterized by the presence of peritubular dentine.
Dentin Crystal Size
Dentin Crystal Size
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Dentin Crystal Arrangement
Dentin Crystal Arrangement
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Tubule Diameter at Pulp End
Tubule Diameter at Pulp End
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Tubule Diameter at DEJ
Tubule Diameter at DEJ
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Tubule Spacing
Tubule Spacing
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Tubule Shape
Tubule Shape
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Primary Curvature
Primary Curvature
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Dentine Proteins
Dentine Proteins
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Osteocalcin in Dentine
Osteocalcin in Dentine
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Acidic Proteins in Dentine
Acidic Proteins in Dentine
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Dentine Sialoprotein Properties
Dentine Sialoprotein Properties
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Osteonectin in Dentine
Osteonectin in Dentine
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Dentine Glycosaminoglycans
Dentine Glycosaminoglycans
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Dermatan Sulfate in Dentine
Dermatan Sulfate in Dentine
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Dentin Mineralization
Dentin Mineralization
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Phosphophoryn Function
Phosphophoryn Function
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Phosphophoryn Acidity
Phosphophoryn Acidity
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Odontoblastic Processes Concentration
Odontoblastic Processes Concentration
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Intratubular Dentine Location
Intratubular Dentine Location
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Dentin Crystal Shape
Dentin Crystal Shape
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SIBLING Family Proteins
SIBLING Family Proteins
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Acidic Protein Function
Acidic Protein Function
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Chondroitin Sulfate in Dentine
Chondroitin Sulfate in Dentine
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Osteopontin in Dentine
Osteopontin in Dentine
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Dentine Sialoprotein Function
Dentine Sialoprotein Function
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Enamel vs. Dentin Crystals
Enamel vs. Dentin Crystals
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Study Notes
Peritubular Dentine
- Found at the walls of newly formed dentinal tubules at the pulp surface
- Smaller than enamel hydroxyapatite, do not stack with each other, and do not form rods
- Dentine tubules are 2.5 um in diameter at the pulpal end, decreasing to 1um or less at DEJ as odontoblasts retreat inwards
Dentine Structure
- Dentine tubules have a curved S shape, known as primary curvature, and are not straight
- As odontoblasts retreat inwards, tubules become closer due to the smaller area occupied
Dentine Composition
- Contains acidic proteins, including osteonectin, osteopontin, and dentine sialoprotein
- Main glycosaminoglycans are chondroitin 4-sulphate and chondroitin 6-sulphate
- Made of highly mineralized type I collagen (5-12% more mineralized than inter-tubular dentine)
Non-Collagenous Proteins
- Phosphophoryn (PP-H): the main phosphoprotein in dentine, implicated in mineralization, and the most acidic protein known
- Phosphophoryn is most heavily concentrated near the mineralizing front in predentine
- SIBLING (small integrin-binding ligand N-linked glycoproteins) family includes osteopontin, bone sialoprotein, DMP-1, matrix extracellular phosphoglycoprotein, and dentine sialophosphoprotein
Inorganic Material
- Found on and between collagen fibrils
Dentine Crystals
- Different from enamel crystals
Organic Composition
- Accounts for 20% of dentine composition
- Includes basic information about phospholipids, which are needlelike 'crystal ghosts' and may be involved in the formation and growth of crystals
Translucent Dentine
- Regions blocked by peritubular dentine appear translucent when a ground section of a root is placed in water
- Regions with patent tubules appear opaque when filled with water
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Description
Test your knowledge on tooth structure and enamel rods. Learn about the difference between enamel hydroxyapatite and enamel rods in teeth.
