Pulp histology and dentin pulp Flashcards
what is the pulp cavity
central space of tooth that has neurovascular structures and LCT
what is in the pulp chamber and where is it
pulp horns and furcation zones
located in crown
what is in the root cannal and where is it
radicular pulp and in root
what is the apical foramen and what is significant about it
opening of the apex in root
entry of neurovasculatar structures from periodontium to pulp. the foramen forms open communication with surrounding periodontal area
**INFECTION SPREAD
what is the 2 way infection spread in pulp
pulp -> PDL space AND PDL space -> pulp of adjacent teeth
what is the pulp comprised of DICT or LCT
LCT
what makes up the LCT
75% water
25% organic
5% collagen I and III
T/F there are elastic fibers in the LCT
FALSE
what are the two layers in the peripheral region of the pulp chamber
odontoblastic layer and sub-odontoblastic layer
what is found in the odontoblastic layer
odontoblasts that are fully mature
what is found in the sub-odontoblastic layer
hoehl’s cells = odontoblast precursor
CFZ = tons of unmye nerve fibers and capillaries
CRZ = tons of fiberblasts, WBC, stem cells, MYElinated nerves via plexus of Raschkow
what is in the central pulp core
neurovasculature stuff here
BV branch into capillary bed.
large axon nerve plexus of Raschkow –> extends into sub-odonto region. mye alpha delta and alpha beta and UNMYE C fibers
5 cells in the pulp
Odontoblasts
hoehl cells
undiff stem cells
fibroblasts
WBC
what do odontobaslts produce
dentin, ECM, GF
**primary, secondary and tertiary dentin
what are post-mitotic and polarized cells
odontoblasts
what are odontoblast precursors and produce 3 dentin
hoehl’s cells
what are ectomesenchyme derived and found in the CRZ
undiff stem cells
what can become odontoblast like cells and deposit 3 REPARATIVE dentin
undiff stem cells
what cells are found in the CRZ and central pulp and root that maintain the LCT
fibroblasts
what increase in activity during age and can cause fibrosis in the pulp horns and canal
fibroblasts
what types of WBC are found in the pulp
macrophages, APC, lymphocytes, leukocytes
what forms a capillary bed in the crown
sup/inf alveolar vessels (enter via apical foramen)
does the capillary bed in the crown enter the dentin tubules?
NO!!
what controls blood flow to the capillaries
autonomic POST-gang SYMPATHTICS
in a carious lesion, does the capillary bed become more or less permeable
MORE! WBC influx into the pulp and this can lead to necrosis and nerve fibers dying
T/F cementum can get deposited at the apical foramen and we can also get calcification of pulp vessels
TRUE
T/F the root has more nerve fibers that crown
FALSE!! crown has more
Do we have GSA or GVA fibers in the pulp
GSA!!
what are the GSA nerves
superior dental plexus = ant, middle, post of V2
IAN
incisive (V3)
pathway of GSA fibers
convey pain/temp to trige ganglion –> spinal nuc of V –> trigeminothalamic tract –> somatosensory cortex
3 types of GSA fibers
alpha delta (MYE)
alpha beta (MYE)
c fibers (UNMYE)
what is the GVE fiber
POST-gang SYMPATHETIC unmye!!
what does the post gang sympathic fibers do
vasoCONSTRICT BV
what are the 2 things you need to have sensitivity
- dentin exposure
- tubules that are patent
what theory do we think is true for sensitivity and what is it
HYDROdynamic
fluid movement through tubules displaces cell/process leading to stimulation of nerve fibers in the tubules and pulp
T/F reactionary dentin is slow and has no tubules
FALSE
it IS slow but HAS irregular tubules
what produces reactionary dentin
OB and hoehl cells
is reparative dentin slow or fast and does it have tubules or no tubules
FAST and NO tbules
what produces reparative dentin
pulp stem cells
what in interglobular dentin
due to change in mineralization
is interglobular dentin associated with reparative or reactionary dentin
REACTIVE dentin
what does a calciotraumatic line show and separates
shows there was a disruption in calcification
separates 2 dentin from reactive 3 detin
what are true pulp stones
comprised of DENTIN and has dentin tubules
what are false pulp stones
concentric mass of calcified matrix due to cellular degeneration that is then calcified. can be free or attached
T/F FALSE pulp stones contain dentin
FALSE! TRUE do
what type of pulp stones are most common
FREE FALSE stones
what are dystrophic calcifications
diffuse calcification involving BV due to age or trauma
what are some things that happen when we age
- change in size and shape of pulp chamber and canal
- DECREASE permeability in dentin due to INCREASE deposited of peritubular dentin -> sclerotic dentin
what type of dentin is put down in response to carious lesions
REACTIONARY (slow and irregular tubules)
pathway of carious lesion
acids diffuse through pores -> demin enamel -> reaches DEJ -> dentin tubules = initiates inflam response in pulp ——> LEADS TO ——–> sclerotic 3 REACTIONARY dentin deposited
where is the PRE-cavitated zone
DEJ -> pulp
what is in the pre-cavitated zone
- body of lesion
- sclerotic zone (translucent zone)
reactive dentin too
what is b/w the DEJ and sclerotic zone. has demineralization and some remineralization or caries arrested
BODY of lesion
what is a hypermineralized region also called the translucent zone
SCLEROTIC zone
what is the POST-cavitated zone
enamel and dentin become cavitated and acid and bac enter the dentin tubules to cause further destruction
what is in the OUTER layer of the POST-cavitated zone
- zone of destruction/necrotic dentin
- zone of penetration/contamination
what is the OUTER layer of the POST-cavitated zone
INfected dentin. soft and wet
what zone has IRREVERSIBLE collapse of collagen matrix and tubules destroyed (soft)
zone of destruction/necrotic dentin
what is the INNER layer of the POST-cavitated zone
gradient of demineralization of matrix. AFFECTED dentin = leathery and firm
what zone is in the INNER layer of the POST-cavitated zone
zone of demineralized sclerotic
little bac here but still have acid present and sound dentin as well as tertiary dentin
signs of REversible pulpitis
COLD and NON-spont
signs of IR-reverisble pulpitis
WARM and SPONT
signs of necrotic pulp
no reponse due to lack of blood supply
T/F pulp inflam can lead to external root reabsorption
FALSE!! INTERNAL root reabsorption
external would be due to trauma/ infection to PDL
