Podcast
Questions and Answers
What approximate percentage of dentine's composition is made up of inorganic minerals?
What approximate percentage of dentine's composition is made up of inorganic minerals?
- 50%
- 10%
- 20%
- 70% (correct)
Which structural component is the main structural unit of dentine?
Which structural component is the main structural unit of dentine?
- Intertubular dentine
- Dentine tubules (correct)
- Interglobular dentine
- Mantle dentine
What is the structure called that is immediately surrounding the odontoblastic process within the dentine tubule?
What is the structure called that is immediately surrounding the odontoblastic process within the dentine tubule?
- Peritubular dentine
- Mantle dentine
- Periodontoblastic space (correct)
- Intertubular dentine
In which region of the tooth is the Granular Layer of Tomes located?
In which region of the tooth is the Granular Layer of Tomes located?
Which type of dentine is formed before the completion of root formation?
Which type of dentine is formed before the completion of root formation?
What is the primary characteristic of sclerotic dentine?
What is the primary characteristic of sclerotic dentine?
What is the clinical significance of the fluid-filled content within dentine tubules?
What is the clinical significance of the fluid-filled content within dentine tubules?
Which factor primarily influences the permeability of dentine?
Which factor primarily influences the permeability of dentine?
How does the color of dentine typically change in disease compared to healthy dentine?
How does the color of dentine typically change in disease compared to healthy dentine?
What distinguishes reactionary dentine from reparative dentine in tertiary dentinogenesis?
What distinguishes reactionary dentine from reparative dentine in tertiary dentinogenesis?
What is the composition of intertubular dentine compared to peritubular dentine?
What is the composition of intertubular dentine compared to peritubular dentine?
What is the functional significance of dentine's rigid yet elastic nature?
What is the functional significance of dentine's rigid yet elastic nature?
How do the tubules run underneath the cusps?
How do the tubules run underneath the cusps?
What is the space called that surrounds the odontoblastic process?
What is the space called that surrounds the odontoblastic process?
What are interglobular dentine?
What are interglobular dentine?
What vitamin deficiency can cause interglobular dentine?
What vitamin deficiency can cause interglobular dentine?
Why does the amount of sclerotic dentine increase with age?
Why does the amount of sclerotic dentine increase with age?
What is another name for tertiary dentine?
What is another name for tertiary dentine?
Where is the granular layer of Tomes found?
Where is the granular layer of Tomes found?
If tertiary dentine has tubules, what are they like?
If tertiary dentine has tubules, what are they like?
What is the composition of dentine?
What is the composition of dentine?
Name the correct order of the different layers of dentine.
Name the correct order of the different layers of dentine.
Which of the following features is unique to root dentine?
Which of the following features is unique to root dentine?
What is the function of dentine relating to the pulp?
What is the function of dentine relating to the pulp?
What does it traditionally mean if the teeth appear more yellow clinically?
What does it traditionally mean if the teeth appear more yellow clinically?
What do the 'dead tracts' show about the odontoblastic processes?
What do the 'dead tracts' show about the odontoblastic processes?
How does dentine appear on radiographs?
How does dentine appear on radiographs?
What are the incremental lines called?
What are the incremental lines called?
Which is the most accurate statement about sclerotic dentine?
Which is the most accurate statement about sclerotic dentine?
Which type of dentine is usually localized to an area of stimulus?
Which type of dentine is usually localized to an area of stimulus?
What determines if caries will progress through dentine?
What determines if caries will progress through dentine?
Which of the following is approximately 20% of the composition of dentine?
Which of the following is approximately 20% of the composition of dentine?
Which of the following is also known as intratubular dentine?
Which of the following is also known as intratubular dentine?
What is the name for the cytoplasmic extension of the odontoblast?
What is the name for the cytoplasmic extension of the odontoblast?
What is the name for the more distinct incremental line at the interface between primary and secondary dentine?
What is the name for the more distinct incremental line at the interface between primary and secondary dentine?
Which of the following best describes a visual characteristic of dentine?
Which of the following best describes a visual characteristic of dentine?
Once caries progresses to dentine, how can it be best described radiographically?
Once caries progresses to dentine, how can it be best described radiographically?
What process allows sensations/feelings via the dentine?
What process allows sensations/feelings via the dentine?
What are some of the functions of dentine?
What are some of the functions of dentine?
Which of the following best describes the arrangement of dentinal tubules near the dentinoenamel junction (DEJ) compared to near the pulp?
Which of the following best describes the arrangement of dentinal tubules near the dentinoenamel junction (DEJ) compared to near the pulp?
What is the predominant inorganic component of dentine?
What is the predominant inorganic component of dentine?
What is the organic matrix of dentine mainly composed of?
What is the organic matrix of dentine mainly composed of?
What is the approximate water content in dentine?
What is the approximate water content in dentine?
What is the function of the periodontoblastic space?
What is the function of the periodontoblastic space?
What is the function of the odontoblastic process?
What is the function of the odontoblastic process?
How might the arrangement of dentinal tubules contribute to dentine's sensitivity during a dental procedure?
How might the arrangement of dentinal tubules contribute to dentine's sensitivity during a dental procedure?
Which statement accurately describes the mineral content of peritubular dentine compared to intertubular dentine?
Which statement accurately describes the mineral content of peritubular dentine compared to intertubular dentine?
What is the functional significance of dentinal tubules traversing in an S-shape through the dentine?
What is the functional significance of dentinal tubules traversing in an S-shape through the dentine?
How does the collagen content in intertubular dentine compare to that in peritubular dentine?
How does the collagen content in intertubular dentine compare to that in peritubular dentine?
What characteristic makes dentine able to withstand occlusal forces?
What characteristic makes dentine able to withstand occlusal forces?
What happens to odontoblasts that become crowded during dentinogenesis?
What happens to odontoblasts that become crowded during dentinogenesis?
What is the clinical relevance of the communication between dentine and pulp?
What is the clinical relevance of the communication between dentine and pulp?
From which embryonic structure is dentine derived?
From which embryonic structure is dentine derived?
If a patient experiences sharp pain from thermal stimuli, which component of the tooth is MOST directly responsible for transmitting this sensation?
If a patient experiences sharp pain from thermal stimuli, which component of the tooth is MOST directly responsible for transmitting this sensation?
Name the walls of the tubules.
Name the walls of the tubules.
What is found inside the dentine tubule?
What is found inside the dentine tubule?
What is found between the tubules?
What is found between the tubules?
Which of the following components is present in the dentinal tubules?
Which of the following components is present in the dentinal tubules?
What is the approximate percentage of organic material in dentine?
What is the approximate percentage of organic material in dentine?
Flashcards
Dentine Composition
Dentine Composition
Dentine is composed of approximately 70% inorganic minerals, 20% organic material, and 10% water.
Dentine Tubules
Dentine Tubules
Minute tubules that permeate the dentine structure, extending from the DEJ to the pulp chamber.
Contents of Dentine Tubules
Contents of Dentine Tubules
The odontoblastic process, a cytoplasmic extension of the odontoblast, is contained within dentine tubules.
Peritubular Dentine
Peritubular Dentine
Highly calcified wall of the dentine tubules with minimal collagen.
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Intertubular Dentine
Intertubular Dentine
Less calcified, more collagenous dentine between tubules, making up the bulk of dentine.
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Interglobular Dentine
Interglobular Dentine
Areas of unmineralized dentine that have failed to fuse, often found below mantle dentine.
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Sclerotic Dentine
Sclerotic Dentine
Calcified dentine tubules via mineral deposition, common in apical third of root; reduces permeability.
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Dead Tracts
Dead Tracts
Empty dentine tubules where the odontoblastic process has died or retracted.
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Lines of Von Ebner
Lines of Von Ebner
Incremental lines reflecting the pattern of dentinogenesis, close together and difficult to visualize.
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Contour Lines of Owen
Contour Lines of Owen
More distinct incremental lines at the interface between primary and secondary dentine.
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Granular Layer of Tomes
Granular Layer of Tomes
Narrow layer found only in root dentine beneath the cemento-dentinal junction.
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Mantle Dentine
Mantle Dentine
Initial formed dentine that outlines the periphery of the dentine adjacent to the enamel and cementum.
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Circumpulpal Dentine
Circumpulpal Dentine
The bulk of the dentine containing the dentine tubules, lying between the mantle and pre-dentine.
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Pre-dentine
Pre-dentine
Dentine matrix surrounding the pulp chamber.
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Primary Dentine
Primary Dentine
The bulk of the dentine within the tooth that forms prior to completion of root formation.
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Secondary Dentine
Secondary Dentine
Dentine that forms slowly throughout life after root formation is complete.
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Clinical Significance of Secondary Dentine
Clinical Significance of Secondary Dentine
Pattern of secondary dentine protects the dental pulp and helps it shrink over time.
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Tertiary Dentine
Tertiary Dentine
Tertiary dentine is usually localized to an area of the tooth in response to stimuli
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Main functions of dentine
Main functions of dentine
Support for enamel, protection for pulp, communication via tubules, and repair through tertiary dentine.
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Dentine Structure Function
Dentine Structure Function
Dentine’s rigid mineral content and elastic collagen allow absorption of shock on teeth.
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Dentine color
Dentine color
Yellowish in health due to less mineralization, turning brown in disease.
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Dentine Permeability
Dentine Permeability
Varies within the structure making it more / less permeable
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Dentine origin
Dentine origin
Derived from ectomesenchyme neural crest
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Periodontoblastic space
Periodontoblastic space
Small fluid-filled space surrounding odontoblastic processes
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Communication in dentine
Communication in dentine
Located in dentine tubules and key for understanding dentine hypersensitivity
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Main structure of tubules
Main structure of tubules
The dentine structure is permeated by tubules extending from the DEJ to the border of the pulp chamber
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Shape of tubules
Shape of tubules
Allows it to withstand forces
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Composition and Structure
- Dentine is derived from ectomesenchyme.
- It consists of 70% inorganic minerals, which are primarily calcium hydroxyapatite.
- 20% of dentine is organic materials, consisting of 18% collagenous rich matrix and less than 2% non-collagenous matrix proteins and lipids.
- Water makes up 10% of dentine.
- Dentine gives the tooth is flexi, avascular, and mineralised qualities like connective tissue.
Dentine Tubules
- Dentine tubules are the main structural component of dentine.
- These tubules permeate the dentine structure, extending from the DEJ to the border of the pulp chamber.
- The tubules follow an S-shape.
- These withstand forces due to their shape.
- Underneath cusps, incisal edges, and root tips, the tubules are almost straight.
- Tubules are more widely separated near the DEJ compared to near the pulp, resulting in a tapered outline.
- This pattern reflects the path of odontoblasts during dentinogenesis.
- As odontoblasts become crowded, some may die off to create space.
Peritubular and Intertubular Dentine
- The wall of the tubules is called peritubular or intratubular dentine.
- It is highly calcified with minimal collagen.
- Dentine between the tubules is intertubular dentine.
- Intertubular dentine is less calcified, contains more collagen, and makes up the bulk of dentine.
Contents of the Dentine Tubule
- Each tubule contains an odontoblastic process, which is a cytoplasmic extension of an odontoblast.
- The odontoblastic process is surrounded by the periodontoblastic space, which is filled with fluid.
- Communication from dentine to pulp is key for protection.
- Dentine hypersensitivity can result due to this.
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