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Questions and Answers
What is the primary component of dentine that makes up approximately 70% of its composition?
What is the primary component of dentine that makes up approximately 70% of its composition?
- Collagen fibers
- Calcium hydroxyapatite (correct)
- Lipids
- Non-collagenous proteins
Which type of dentine is formed in response to external stimuli such as caries or trauma?
Which type of dentine is formed in response to external stimuli such as caries or trauma?
- Primary dentine
- Intertubular dentine
- Tertiary dentine (correct)
- Secondary dentine
What is the main function of dentine in the tooth structure?
What is the main function of dentine in the tooth structure?
- To protect the pulp from infection
- To absorb and transmit forces during chewing (correct)
- To provide sensory feedback to the brain
- To serve as a framework for enamel
Which of the following correctly describes the composition of dentine?
Which of the following correctly describes the composition of dentine?
What is the role of dental tubules in dentine?
What is the role of dental tubules in dentine?
Which type of dentine is formed during the normal development of a tooth?
Which type of dentine is formed during the normal development of a tooth?
In terms of embryonic origin, dentine is derived from which type of tissue?
In terms of embryonic origin, dentine is derived from which type of tissue?
Which feature is primarily linked to the assessment of dentine health in clinical practice?
Which feature is primarily linked to the assessment of dentine health in clinical practice?
Which of the following correctly distinguishes between primary, secondary, and tertiary dentine?
Which of the following correctly distinguishes between primary, secondary, and tertiary dentine?
What is the primary organic component found in dentine?
What is the primary organic component found in dentine?
How does the structure of dentine contribute to its function?
How does the structure of dentine contribute to its function?
Which of the following best describes the inorganic components of dentine?
Which of the following best describes the inorganic components of dentine?
In relation to the clinical significance, what aspect of dentine should a clinician focus on?
In relation to the clinical significance, what aspect of dentine should a clinician focus on?
What aspect is crucial for interpreting the health of dentine in dental health?
What aspect is crucial for interpreting the health of dentine in dental health?
Which type of bonding materials is typically used for restorative procedures involving dentine?
Which type of bonding materials is typically used for restorative procedures involving dentine?
Which characteristic of dentine is most important for its role in managing hypersensitivity?
Which characteristic of dentine is most important for its role in managing hypersensitivity?
What is the relationship between the structure of dentine and the natural aging process of teeth?
What is the relationship between the structure of dentine and the natural aging process of teeth?
What distinguishes reactionary tertiary dentine from reparative tertiary dentine?
What distinguishes reactionary tertiary dentine from reparative tertiary dentine?
Which feature of dentine contributes most to its ability to transmit sensations?
Which feature of dentine contributes most to its ability to transmit sensations?
What color change in dentine can indicate potential health issues?
What color change in dentine can indicate potential health issues?
How does dentine's permeability affect caries progression?
How does dentine's permeability affect caries progression?
Which characteristic of adult teeth is related to dentine?
Which characteristic of adult teeth is related to dentine?
What happens to dentine when exposed to certain restorative procedures?
What happens to dentine when exposed to certain restorative procedures?
Which of the following statements about the color of dentine is true?
Which of the following statements about the color of dentine is true?
In radiographs, how does dentine typically appear in comparison to other structures?
In radiographs, how does dentine typically appear in comparison to other structures?
What is a significant clinical implication of dentine's permeability?
What is a significant clinical implication of dentine's permeability?
What factor impacts the visibility of carious lesions in dentine on radiographs?
What factor impacts the visibility of carious lesions in dentine on radiographs?
What is a characteristic feature of sclerotic dentine?
What is a characteristic feature of sclerotic dentine?
What defines the incremental lines of Von Ebner in dentine?
What defines the incremental lines of Von Ebner in dentine?
How is tertiary dentine formed?
How is tertiary dentine formed?
What is the primary role of the granular layer in dentine?
What is the primary role of the granular layer in dentine?
Which statement best describes primary dentine?
Which statement best describes primary dentine?
What provides the characteristic S-shaped curve of dental tubules?
What provides the characteristic S-shaped curve of dental tubules?
What distinguishes secondary dentine from primary dentine?
What distinguishes secondary dentine from primary dentine?
Which of these options best describes the role of intertubular dentine?
Which of these options best describes the role of intertubular dentine?
In terms of dentinogenesis, what is the most significant aspect of pre-dentine?
In terms of dentinogenesis, what is the most significant aspect of pre-dentine?
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Study Notes
Dentine Composition and Structure
- Dentine is a hard, calcified tissue found in the tooth
- It is located beneath the enamel and surrounds the pulp
- Dentine is composed of approximately 70% inorganic minerals, primarily calcium hydroxyapatite, which is smaller than enamel's hydroxyapatite crystals
- Dentine also contains 20% organic material:
- Majority is a collagenous rich matrix (18%)
- Minority is non-collagenous matrix proteins and lipids (2%)
Dentin: Composition and Structure
- Dentine is a hard, calcified tissue that forms the bulk of a tooth, located beneath the enamel.
- About 70% of dentine is composed of inorganic minerals, primarily calcium hydroxyapatite, but the crystals are smaller than those in enamel.
- Roughly 20% of dentine's composition is organic material, including collagenous rich matrix (about 18%) and non-collagenous matrix proteins and lipids.
- The mineral composition and structure of dentine contribute to its hardness and ability to resist wear and tear.
- Dentin is vital for the tooth's structural integrity and supports the enamel.
- It also plays a crucial role in the tooth's response to stimuli like temperature changes and pressure, contributing to tooth sensitivity.
- Knowledge about dentine's composition and structure is essential for understanding dental pathologies, restorative procedures, and management of oral health conditions.
Tertiary Dentine
- Tertiary dentine forms in response to various stimuli such as caries or abrasion.
- Tertiary dentine can be reactionary or reparative, depending on the severity of the stimulus.
- Reactionary dentine is produced by pre-existing odontoblasts.
- Reparative dentine is formed by newly differentiated odontoblast-like cells.
- Reparative dentine can sometimes create osteodentine.
Colour of Dentine
- Healthy dentine is typically yellow due to lower mineralization compared to enamel.
- Diseased dentine can turn brown or darker affecting the tooth's appearance.
Dentine Permability
- Dentine is somewhat permeable due to tubules, with permeability levels varying by location.
- Tubule permeability affects caries progression and can impact sensation transmission to the pulp.
- Fluid content in dentine can trigger sensitivity or pain.
Radiographic Appearance of Dentine
- Dentine appears as a radio-opaque structure on radiographs.
- Caries lesions in dentine show as radiolucent areas.
- Dead tracts are empty dentine tubules where the odontoblastic process has died or retracted.
Incremental Lines of Von Ebner
- Thin, closely spaced lines in dentine formed during incremental dentinogenesis.
Contour Lines of Owen
- More pronounced incremental lines found at the interface between primary and secondary dentine.
Granular Layer
- A narrow layer with a granular appearance located in root dentine beneath the cemento-dentinal junction.
Types of Dentine
- Mantle dentine: Initial dentine formed, adjacent to enamel and cementum.
- Circumpulpal dentine: Forms the bulk of dentine, containing dental tubules.
- Pre-dentine: Surrounds the pulp chamber, allowing dentinogenesis to continue.
Primary Dentine
- Forms before root development completion, including both mantle and circumpulpal dentine.
Secondary Dentine
- Formed after root completion, slowly throughout life, leading to gradual pulp recession.
Clinical Significance of Secondary Dentine
- Secondary dentine accumulation shrinks the pulp space, reducing sensitivity in older teeth.
Clinical Significance of Tertiary Dentine
- Tertiary dentine protects the pulp by creating a barrier against further damage.
- Tertiary dentine is formed due to caries, attrition, or abrasive brushing.
Dentine Composition
- Inorganic (70%): Calcium hydroxyapatite.
- Organic (20%): Majority collagenous matrix and some non-collagenous proteins and lipids.
- Water (10%).
Dental Tubules
- The main structural feature of dentine, extending from the DEJ to the pulp chamber.
- Contribute to dentine's role in sensation and permeability.
Tubule Structure
- Tubules follow an S-shaped curve.
- Tubules are more widely spaced near the DEJ, creating a tapered structure closer to the pulp.
Tubule Composition
- Tubule walls are composed of peritubular (or intratubular) dentine which is highly calcified with minimal collagen content.
- Intertubular dentine, found between tubules, is less calcified and more collagenous.
Odontoblastic Process
- Each tubule contains an odontoblastic process.
- The periodontoblastic space around this process contains fluid, crucial for understanding dentine hypersensitivity.
Interglobular Dentine
- Areas of unmineralized dentine, often found near the circumpulpal dentine.
Sclerotic Dentine
- Tubules that have become calcified due to mineral deposits.
- Sclerotic dentine increases with age and reduces dentine permeability.
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