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Questions and Answers
What is the primary composition of dentine by weight?
What is the primary composition of dentine by weight?
Which type of dentine is formed in response to external stimuli or damage?
Which type of dentine is formed in response to external stimuli or damage?
What is the primary functional significance of the dental tubules in dentine?
What is the primary functional significance of the dental tubules in dentine?
The majority of the organic material in dentine is composed of which component?
The majority of the organic material in dentine is composed of which component?
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Which of the following best describes the structural relationship between dentine and enamel?
Which of the following best describes the structural relationship between dentine and enamel?
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Study Notes
Dentine Composition and Structure
- Dentine is a hard, calcified tissue that forms the bulk of the tooth.
- It is located beneath the enamel and surrounds the pulp.
- Dentine is composed of approximately 70% inorganic minerals, primarily calcium hydroxyapatite.
- The calcium hydroxyapatite crystals in dentine are smaller than those found in enamel.
- Dentine also contains 20% organic material, primarily collagenous rich matrix.
- This collagenous matrix makes up roughly 18% of the organic material.
- The remaining 2% of the organic material consists of non-collagenous matrix proteins and lipids.
- Non-collagenous matrix proteins include dentin sialophosphoprotein, dentin phosphoprotein, and collagen type I.
- Dentine is characterized by a network of microscopic tubules known as dentinal tubules.
Dentine Formation
- Dentinogenesis is the process of dentine formation.
- It begins during tooth development and continues throughout life.
- Odontoblasts located in the pulp produce dentin.
Types of Dentine
- Primary dentine is formed during the developmental stage of the tooth.
- Secondary dentine is formed throughout life, gradually reducing the pulp chamber size.
- Tertiary dentine is a reactive dentine formed in response to injury or irritation.
Clinical Significance of Dentine
- Knowledge of dentine is essential for understanding dental caries and dentin hypersensitivity.
- Dentine is also important for understanding the restorative and bonding materials used in dentistry.
- Radiographs can be used to identify healthy and affected dentine.
- Dentine plays a role in the management of dentin hypersensitivity.
- Dentine is involved in the repair of infected and damaged dentine.
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Description
This quiz explores the composition and structural characteristics of dentine, the major tissue in teeth. It covers the inorganic and organic components, the role of odontoblasts in dentinogenesis, and the significance of dentinal tubules. Ideal for dental students and professionals seeking to deepen their knowledge about tooth anatomy.
