Chapter 13 Dentin & Pulp
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| The inner portions of the tooth are made up of? | Dentin and Pulp
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| Dentin is more hard or less hard than enamel. | Dentin is LESS hard than enamel.
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| Dentin Compostion | Calcium Hydroxyapatite
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| Root dentin is protected by what? | cementum
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| Crown dentin is protected by what? | enamel
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| Clinical Considerations with Dentin | Attrition, gingival recession, and dentin hypersensitivity, caries
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| Odontoblasts come from where? | Originally outer cells of the dental papilla.
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| Odontoblasts produce what? | Lay down the initial material called predentin
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| The process of dentin matrix formation occurs during the apposition stage of the tooth development is known as? | Dentinogenesis
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| What are the calcium hydroxyapatite crystals doing during the primary mineralization phase? | Forming as globules and fusing together
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| 3 Types of Dentin | Primary, Secondary, and Tertiary
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| When is the primary dentin formed? | BEFORE completion of the apical foramen
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| Is the primary dentin mineralized? | yes, more mineralized than the secondary dentin
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| When is the secondary dentin formed? | AFTER completion of the apical foramen and continues to form throughout the life of the tooth.
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| Is the secondary dentin formed slower or faster than the primary? | Forms slower and has less mineralization
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| Tertiary dentin is formed when? | Forms quickly as a result of an injury.
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| Where is the tertiary dentin found? | underneath the exposed dentin tubules.
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| What is the function of the tertiary dentin? | To seal off the injured area and repair.
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| What happens to the odontoblasts when there is damaged dentin? | They can perish due to injury.
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| How do mesenchymal cells help? | They come from the pulp to help repair the damaged tubules.
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| Peritubular Dentin | Wall of tubules; highly calcified.
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| Intertubular Dentin | Between tubules; highly calcified
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| Mantle Dentin | Outermost layer; first dentin formed
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| Cicrumpulpal Dentin | layer around outer plural wall.
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| Innermost tissue of the tooth is what? | Pulp
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| What does the pulp develop from? | The central cells of the dental papilla.
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| What is the function of the pulp? | To support, maintenance and continued formation of dentin.
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| The pulp provides what to the dentin? | nutritional support.
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| Where is coronal pulp located? | in the crown of the tooth.
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| Where is the radicular pulp located? | in the root area of the tooth.
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| What is pulpitis? | pulp undergoes inflammation due to some type of injury.
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| What are pulp stones? | Calcified stones that develop during tooth development.
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| What can happen to the pulp as people age? | pulp can become more fibrotic and the pulp cavity can become smaller.
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