Pulpal Irritants Flashcards
Irritants can be what three kinds
Microbial
Mechanical
Chemical
What is the goal in vital cases
Asepsis; to prevent infection, this includes use of a dam to keep bugs out.
What is the goal in non-vital cases
Antisepsis; to remove all microorganisms
What organisms are easily eradicated during conventional RCT
Obligate anaerobes
What are some examples of facultative bacteria
Streptococci
Enterococci
Lactobacilli
What organisms can survive chemo-mechanical RCT
Facultative bacteria
What one bacteria is frequently associated with failed RCTs
E. faecalis
What are some examples of mechanical irritants:
Deep cavity prep Lack of cooling Impact trauma Occlusal trauma Deep perio curettage Ortho movement (too far or too fast)
What are some example of chemical irritants
Dentin: cleaning, sterilizing and desensitizing agents.
Some temp and permanent filling materials
Which fibers are myelinated
A-fibers; myelinAted, fAst, fAt
A-delta fibers are for
Paint
temperature
Touch
C-fibers are for
Pain; dorsal root, deep inside the pulp
Where are A-delta fibers principally located
Pulp-dentin junction
What type of pain comes from A-delta fibers
Sharp
Pricking
Relative low threshold
Where a C fibers principally located
Throughout the pulp
What type of pain comes from C fibers
Burning
Aching
Less bearable than A-delta fiber sensation
High threshold usually associated with tissue injury
What is another name for the cell free zone
Zone of Weil
Where is the zone of Weil
Immediately adjacent to odontoblastic layer in coronal pulp
When is the zone of Weil mostly found
During middle age pulps
What is the cell rich zone
Subodontoblastic area
High proportion of fibroblasts
Immune cells: macros, dendritic cells, undif mesenchymal cells
Eventual or rapid necrosis depends on?
The virulence of bacteria Ability to release inflammatory fluid to prevent increase in intrapulpal pressure. Host resistance Amount of circulation LYMPH DRAINAGE
SAP lesions are more likely to have what two viruses
Cytomegalovirus
Epstein barr Virus
What substance participates in the inflammatory reaction of the dental pulp
metabolites of arachidonic acid
Metabolism of arachidonic acid results in the formation of what metabolites
Prostaglandins
Thromboxanes
Leukotrines
