* outlines the pulp chamber; * forms the initial shape of the tooth; * formed before root completion.
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Secondary Dentin
* forms on all internal aspects of the pulp cavity. * Represents the continuing, but much slower, deposition of dentin by the odontoblasts after root formation has been completed.
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Tertiary Dentin
* produce in reaction to noxious stimuli, such as caries or a restorative dental procedure.
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Tertiary Dentin
also referred to as:
* REACTIVE, * REPARATIVE or * IRREGULAR SECONDARY DENTIN
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Sclerotic Dentin
results from aging or mild irritation & causes change in the composition of the primary dentin.
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Dead Tracts
areas of dentinal tubules that are empty & are black when viewed microscopically.
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Eburnated Dentin
* outward (exposed) portion of reactive * sclerotic dentin where slow caries has destroyed formerly overlying tooth structure, leaving a hard, darkened cleanable surface.
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Hydrodynamic Theory
* The most accepted theory of pain transmission * This accounts for pain transmission by the small rapid movement of fluids that occur within the dentinal tubules
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Deep Dentin
less effective pulpal barrier than superficial dentin near the DEJ or dentinoenamel junction.
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Smear Layer
composed of denatured collagen, hydroxyapatite & other cutting debris.
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Smear Plugs
serves as a natural bandage over the cut dentinal tubules because it occludes many of the dentinal tubules with debris
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Smear Plugs
formed from cutting debris forced into the tubules
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Pulp
soft connective tissue that occupies the central portion of the tooth.
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Pulp organ is divided into:
* CORONAL PULP
* RADICULAR PULP
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Coronal Pulp
located in the pulp chamber in the crown portion of the tooth, including the pulp horns that are directed toward the incisal ridges & cusps tips.
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Radicular Pulp
located in the pulp canal/s in the root portion of the tooth.