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unexposed inner portion of the tooth, found in the crown and root and discussed as one unit
dentin
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where does the dentin come from?
dental papilla
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What percent of dentin is made up of:
mineralized inorganic material
organic material
water
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What tooth structure makes up the bulk of the tooth?
dentin
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true or false. dentin is avascular, it has no blood vessels
true
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the main function of the dentin is to what?
protect the pulp
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What color is dentin?
yellow
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true or false. Dentin feels rough, but is softer than enamel
true
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Why does apposition of dentin matrix occur throughout the life of the tooth? We can make new dentin if needed?
because the odontoblasts remain living in the outer pulpal wall
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process of dentin matrix formation
dentinogenesis
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initial material laid down by the odontoblasts; they were the outer cells of dental papilla
predentin
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What are the two types of mineralization of dentin?
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Ca hydroxyapatite crystals form as globules in the predentin, expand, and completely fuse together
primary mineralization of dentin
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new globules form in the partially mineralized predentin, and don't completely fuse
secondary mineralization of dentin
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long tube in dentin that extends from the DEJ to the DCJ into the pulp, and run PERPENDICULAR to the DEJ
dentinal tubules
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What 3 structures are contained in the dentinal tubules?
- dentinal fluid
- odontoblastic process
- afferent axon
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long cellular extension still attached to the cell body of the odontoblast within the pulp, in the dentinal tubule
odontoblastic process (keeps forming new dentin)
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myelinated axon located within the pulp and involved in the sensation of PAIN only, in the dentinal tubule
afferent axon
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dentin that creates the wall of the dentinal tubule
peritubular dentin
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dentin that is found between each dentinal tubule
intertubular dentin
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first dentin that is formed
mantle dentin
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layer of dentin around the outer pulpal wall
circumpulpal dentin
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first dentin formed, and formed in a tooth before the completion of the apical formation
primary dentin
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dentin formed after the completion of the apical foramen, and continues to form throughout the life of the tooth, fomred to protect the pulp
secondary dentin
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dentin formed quickly and as a result to injury, forms underneath the exposed dentins tubules along the outer pulpal wall
tertiary dentin
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dentinal tubules diameter__________with age
decreases
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