Pulp histology and dentin pulp Flashcards by Korbyn Perpich

what is the pulp cavity

central space of tooth that has neurovascular structures and LCT

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what is in the pulp chamber and where is it

pulp horns and furcation zones

located in crown

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what is in the root cannal and where is it

radicular pulp and in root

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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

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what is the 2 way infection spread in pulp

pulp -> PDL space AND PDL space -> pulp of adjacent teeth

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what is the pulp comprised of DICT or LCT

LCT

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what makes up the LCT

75% water
25% organic
5% collagen I and III

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T/F there are elastic fibers in the LCT

FALSE

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what are the two layers in the peripheral region of the pulp chamber

odontoblastic layer and sub-odontoblastic layer

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what is found in the odontoblastic layer

odontoblasts that are fully mature

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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

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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

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5 cells in the pulp

Odontoblasts
hoehl cells
undiff stem cells
fibroblasts
WBC

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what do odontobaslts produce

dentin, ECM, GF

**primary, secondary and tertiary dentin

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what are post-mitotic and polarized cells

odontoblasts

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what are odontoblast precursors and produce 3 dentin

hoehl’s cells

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what are ectomesenchyme derived and found in the CRZ

undiff stem cells

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what can become odontoblast like cells and deposit 3 REPARATIVE dentin

undiff stem cells

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what cells are found in the CRZ and central pulp and root that maintain the LCT

fibroblasts

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what increase in activity during age and can cause fibrosis in the pulp horns and canal

fibroblasts

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what types of WBC are found in the pulp

macrophages, APC, lymphocytes, leukocytes

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what forms a capillary bed in the crown

sup/inf alveolar vessels (enter via apical foramen)

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does the capillary bed in the crown enter the dentin tubules?

NO!!

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what controls blood flow to the capillaries

autonomic POST-gang SYMPATHTICS

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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

1. dentin exposure 2. 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

1. change in size and shape of pulp chamber and canal 2. 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

1. body of lesion 2. 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

1. zone of destruction/necrotic dentin 2. 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

Pulp histology and dentin pulp Flashcards

(64 cards)