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Histo 25 - Dent Pulp

QuestionAnswer
How much inorganic material does normal dental pulp contain? None. It does not normally contain mineralized materials.
What three features common to CT compose pulp? Cells (fibroblast and undifferentiated mesenchymal cells). Fibers (Type I and Type III collagen). Ground substance (proteoglycans, glycoproteins and water).
Which type of collagen fibers is found in dental pulp? Type I and Type II collagen as well as reticular fibers in the peripheral region.
Be able to label a diagram of the architecture of pulp. Yeah be able to do that. Page 349
Where is the cell-free zone located? Just below the odontoblast layer at the periphery of the pulp.
What composes the odontogenic layer? Odontoblast cell layer, cell-free zone (of Weil) and the cell-rich zone.
In which layer is the neural plexus located? Just under the odontoblastic zone in the peripheral region of the pulp.
Where is the cell-rich zone? Between the cell-free zone above and the subodontoblastic plexus (of Raschkow) below.
What types of cells predominate in the cell-rich zone? Fibroblasts.
The dense capillary network under the odontoblasts reflect what feature of this layer? The fact that the primary function of dental pulp is the support and maintenance of its peripheral odontoblast layer. Odontoblasts in turn maintain the dentin.
Is there are lymphatic drainage in of the pulp? It is widely now believed to exist.
In the negative theory of lymphatic drainage, where does tissue fluid drain in lieu of them? In lieu of lymphatics, tissue fluid would drain into capillaries or post-capillary venules within the pulp.
List the two types of nerve fibers found in the pulp and the specific function of each. 1) Autonomic (unmyelinated) - regulare blood flow in the capillary network. 2) Afferent (myelinated/unmylinated) or sensory - transmit pain, stimuli from heat, cold or pressure.
With regard to the sensory fibers, where do the myelinated fibers terminate? Myelinated sensory fibers terminate in the central pulp.
Where do unmyelinated nerve fibers terminate? Unmyelinated terminal branches extend from the subodontoblastic plexus up between odontoblasts and even extend up into dentinal tubules.
What type of pain is referred by myelinated fibers? By unmyelinated fibers? Myelinated fibers transmit sharp intense pain while unmyelinated fibers transmit dull throbbing pain.
What are the two types of pulp? Coronal (in the crown) and Radicular (in the root)
Do the two types of pulp differ in composition? No but odontoblasts are stratified in the coronal pulp.
Where would a pulp horn be found? Within the cusp (incisal aspects) of the crown (coronal pulp).
What age-related changes occur in the pulp? With age pulp becomes less cellular, more fibrous and reduced in volume due to continued dentin deposition. In addition, mineralization (pulp stones) become common with age.
Why do changes occur with age to the pulp? Minor pathologic events may lead to cell death in the pulp, surviving fibroblasts respond by producing more Type I collagen fibers and less ground substance.
What are pulp stones? Small mineralized bodies present in over 90% of older teeth.
How are pulp stones though to develop? Pulp stones develop as a result of epithelio-mesenchymal interactions (small groups of cells from the root sheath end up in the dental papilla). Also calcific degeneration (spontaneous calcification) and diffuse calcification (degenerated pulp undergoes.
What are the two types of pulp stones and how can you distinguish one from the other? True pulp stones - exhibit a radiation of dentinal tubule-like structures. False pulp stones have concentric lamellar morphology. Each can also be free in the pulp or attached to the inner aspect or embedded in the dentinal layer.
Created by: dmdevito
 

 



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