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what is the dentin-pulp complex?
unexposed inner portion of tooth that come from undifferentiated mesenchymal cells
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What is the composition of dentin and pulp?
- 70% inorganic material
- 20% organic material
- 10% water
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what portion makes up the bulk of the tooth?
dentin made up of smaller crystals than enamel
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true or false. dentin is avascular
true
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what is the main function of the dentin?
protects the pulp
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what is the initial material laid down by the odontoblasts?
predentin
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process of dentin matrix formation
dentinogenesis
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what stages occur in the apposition of dentin?
- dentinogenesis
- predentin formation by odontoblasts
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what are the two stages of maturation of dentin?
- primary mineralization
- secondary mineralization
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long tube in dentin-extends from DEJ into pulp. this is allows sense to come from the surface of the tooth into the pulp
dentinal tubules
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what is contained in the dentinal tubules?
dentinal fluid, odontoblastic process, and afferent (sensory) axon
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name and describe the 7 different types of dentin:
- peritubular dentin: wall of tubules, highly calcified
- intertubular dentin: between the tubules, highly calcified
- mantle dentin: outermost layer, first dentin formed
- circumpulpal dentin: layer around outer pulpal wall, formed after mantle dentin
- primary dentin: formed befoer completion of aical foramen, formed more rapidly and more mineralized
- secondary dentin: formed after completion of apical foramen, formed slower and is less mineralized than primary
- tertiary dentin: formed as a result of injury
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what is the main functions of the pulp?
- support and maintain formation of dentin
- sensory functions
- nutritional supply to tooth
- protective to tooth by reacting with inflammatory and immune responses when something goes wrong
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what are accessory canals? and how do they form?
- extra canals usually on the lateral portions of the roots of some teeth
- form when hertwig's sheath encounters a blood vessel during root formation. the root structure than forms around the vessel
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the largest group of cells in the pulp
fibroblasts
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2nd largest group of cells in the pulp, only the cell bodys of these exist in the pulp
odontoblasts (with no odontoblastic process)
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