Lesson 6 Flashcards
ZONES OF THE PULP
-› mature dentin
-› odontoblastic zone
-> cell-free zone
cell-rich zone
-› central zone
reaction of tooth
stimuli
explains tooth sensitivity even when pulp tissue is not diseased
HYDRODYNAMIC THEORY
HYDRODYNAMIC THEORY BY?
BRANNSTROM
stimulation of A-delta fibers
HYDRODYNAMIC THEORY BY BRANNSTROM
an external stimuli causes movement of dentinal fluid found inside the tubules causing an outward flow
HYDRODYNAMIC THEORY BY BRANNSTROM
nerve fibers extend into the dentinal tubules (______) and respond to the stimuli or movement
A-delta fibers
_______are found mainly in the central zone of the pulp
C fibers
formation of sclerotic dentin and formation of reparative or tertiary dentin
MILD INJURY
no pulp inflammation
MILD INJURY
no formation of sclerotic or reparative dentin
SEVERE PROLONGED INJURY
stimulus continues to act on pulp tissue developing into inflammation and furthermore pulp disease
SEVERE PROLONGED INJURY
pulp cannot repair and odontoblasts are damaged
SEVERE PROLONGED INJURY
a complex sequence of vascular and cellular changes of tissues in response to injury that subsides only after the effects of the causative factors have been eliminated and the damaged tissue is repaired or returned to a healthy state
PAIN DUE TO INFLAMMATION
rubor
Redness
calor
Heat
Tumor
Swelling
dolor
Pain
function laesa
Loss of function
irritant /stimulus
transient vasoconstriction
vasodilation due to release of inflammatory mediators
increased vascular permeability
transudation/exudation
edema
increased pulpal tissue pressure
compression of blood circulation
increased blood viscosity
stasis of blood flow
localized pulp inflammation
VASCULAR RESPONSE
The ________ occurs first as it is what brings the inflammatory cells to the area of injury.
vascular response
margination
diapedesis
chemotaxis
phagocytosis
CELLULAR RESPONSE
inflammatory cells move into side of blood vessels
Margination
movement through endothelial lining of the blood vessel
Diapedesis
attraction to the irritant
Chemotaxis
removal of irritant or stimulus
Phagocytosis
INFLAMMATION ACCORDING TO ONSET
Acute
Chronic
exudative or immediate
response of tissue to
neutralize injurious agent
Acute
> increase of PMNL
-> rapid course
Acute
-> sudden and intense
short onset
Acute
-> proliferative phase
• > persistent or long-standing
Chronic
-May follow an acute phase or may develop from onset
- (-) pain
Chronic
FEATURES OF THE PULP THAT PLAY A ROLE IN PULP INFLAMMATION
- LOW COMPLIANT ENVIRONMENT
- RESILIENT CONNECTIVE TISSUE (GROUND SUBSTANCE)
- PRESENCE OF ARTERIO-VENOUS ANASTOMOSES (AVA’S)
> the pulp is a soft tissue surrounded by hard tissue (dentin)
when there is presence of inflammation, vasodilation causes increased flow into the area, edema, and increase in intracellular fluid leading to an increase in blood volume
-> because of that, the pulp cannot expand and there is an increase in pressure causing some sort of pain to the patient
LOW COMPLIANT ENVIRONMENT
the ground substance is a gel-like material that becomes watery when damaged
RESILIENT CONNECTIVE TISSUE (GROUND SUBSTANCE)
in its gel-like state, it is able to stop or control the immediate spread of inflammation but when the irritant is too strong, it damages the gel-like consistency leading to further spread of inflammation
RESILIENT CONNECTIVE TISSUE (GROUND SUBSTANCE)
direct connections between arterioles and venules; no capillary bed
PRESENCE OF ARTERIO-VENOUS ANASTOMOSES (AVA’S)
open up to bring blood to the area of inflammation in order to decrease pressure in the pulp
PRESENCE OF ARTERIO-VENOUS ANASTOMOSES (AVA’S)
FACTORS CAUSING INJURY TO THE PULP
BACTERIA
PHYSICAL, THERMAL, MECHANICAL,