Pulp Histology Flashcards
In what stage of tooth development does epithelium rapidly differentiate?
Lamina stage
In what stage is the tooth bud formed with dental mesenchyme on the perimeter?
Bud stage
In what stage is the enamel organ formed?
Cap stage
In which stage is the dental papala further
differentiate?
Bell stage
What are the 5 stages of tooth development?
lamina, bud stage, cap stage, bell stage, eruption
True or False?
Odontoblasts form dentin and dentin interact with ameloblasts to form enamel.
True
Where do the dentin and pulp originate from?
The dental papilla
What are the two parts of the pulp space?
coronal and radicular pulp
True or False? Pup participates in initiation and development of dentin, this in turn leads to formation of enamel.
True
True or False? Pulp supplies nutrients that are essential for dentin formation.
True
True or False? Odontoblasts form dentin in response to injury.
True
True or False? Sensation is the response of pulp to stimuli applied directly or through enamel and dentin
True
What 5 things make up the structure of dental pulp?
- dentin
- predentin (unmineralized dentin matrix)
- odontoblasts
- subodontoblastic plexus of Raschkow (cell free zone and cell rich zone)
- pulp proper
What are the parts of the pulp from outer to inner layer?
odotoblastic zone, cell free zone, cell rich zone, pulp core
What are the cells that make up the pulp?
odontoblasts, fibroblasts, undifferentiated ectomesenchymal cells, macrophages, denritic cells, and lymphocytes
What type of cell synthesizes the matrix and controls the mineralization of dentin?
odontoblasts
What type of junction allows communication between cells?
gap junctions
What type of junction controls permeability of the layer?
tight junctions
What type of junction mechanically links cells?
desmosomes
What is the most common pulp cells which is found in both the cell-rich zone and pulp core?
fibroblasts
What cell forms and maintains the pulp matrix?
fibroblasts
What type of lymphocyte is present in normal pulp?
T cells
What type of lymphocyte is found in inflamed pulp?
B cells
What are the fibers in the extracellular components of pulp?
Type I collagen (predominant), Type III, Type V
What makes up the ground substance in the extracellular of pulp?
glycosaminoglycans, glycoproteins, water (sol-gel)
True or False? Pulpal vessels have thinner walls owing to “low-compliance” environment.
True
What are the types of pulpal nerves?
sensory, sympathetic
What is the significance of pulp stones?
They decrease the overall number of pulp cells, decreases reparative potential, and interferes with RCT but does not cause pain
What happens to pulp when it ages?
increases in collagen, decreases in vascular flow, becomes more fibrous and less cellular
