quiz on pulp and cementum Flashcards
what are products of the dental papilla
pulp and dentin
a loose, noncalcified connective tissue
pulp
highly specialized, calcified connective tissue
dentin
vascular
pulp
avascular
dentin
both____ and ____ form the bulk of the tooth
pulp and dentin
where is pulp located
centrally located tissue in the tooth
coronal pulp is where
crown
radicular pulp is where
in root
fibers of pulp
many collagen fibers
what cells form and maintain collagen in pulp(pulp matrix and ground substance); largest group of cells in the pulp(in cell rich zone)
fibroblasts
help to eliminate dead cells in the pulp
macrophages
WBC; helps in defense in the pulp
lymphocytes
function as cell pool when a new odontoblast or fibroblast is needed in pulp
undifferentiated mesenchymal cells
are there adipose cells in the pulp?
no
form a layer lining the periphery; cell body live in the pulp; cell process extend in the dentin
odontoblasts
what is the 2nd largest group of cells in the pulp?
odontoblasts
outer periphery of the pulp(zone)
odontoblastic zone
zone underneath odontoblastic zone; contains a nerve and capillary plexus; fewer cells than odontoblastic zone
cell free zone of Weil
zone where cell density is very high; mainly fibroblasts
cell rich zone
centrally located where major vessels and nerves are located
pulp core
early pulp interacts and initiates tooth formation
inductive
rich blood supply that forms capillary plexus surrounding odontoblasts
nutritive
odontoblastic cells of pulp form dentin
formative
response to stimuli may trigger formation of reactive/reparative dentin
protective
pulp response to stimuli the brain receives as pain
sensory
in the pulp, blood vessels enter and exit by the _______
apical foramen
extensive vascular network formed in the cell free zone in pulp
capillary plexus
are pulp vessels innervated?
yes
what is a neurovascular bundle?
artery, vein, and a nerve
the nerve cell bodies from the dentinal tubules are located:
between odontoblastic cell bodies in pulp
two types of myelinated fibers in pulp
autonomic, afferent
regulate blood flow
autonomic
mainly from 2nd and 3rd branches of the trigeminal
afferent
pulp stones are also called ___
denticles
form during root development; dentinal tubules present; odontoblast located periphery
true pulp stones
form when components of pulp start to degenerate; dentinal tubules not present
false pulp stones
may be loose in the pulp, attached to the dentin wall, or embedded in the dentin tissue
both true and false
with age in the pulp, you have a decrease in::
intercellular substance, water, and cells
with age you also have a lower rate of collagen degradation which causes
increased collagen fibers
as the pulp ages, size does what
decreases because of continual deposition of dentin
is pulp vital after a root canal?
no
age within the pulp is reflected where
in dentin– there is a cont. deposition of peritubular dentin, scelorotic dentin, etc
cementum is part of the ____
periodontium (tissues supporting and investing the tooth
what does the peridontium consist of
cementum, PDL, alveolar bone, and gingiva facing the tooth
what parts of the periodontium are derived from the dental follicle
cementum, pdl, alveolar bone
is cementum a highly calcified CT?
yes
cementum, alveolar bone, and PDL form attachment apparatus of
teeth, allowing teeth to be suspended in the jaw
bone: avascular or vasucular
vascular
cementum: vascular or avascular
avascular
bone contains:
nerve, and nutrient canals
cementum doesnt contain:
nerve and canals
inorganic, organic and water composittion of cementum
inorganic: 65%
organic: 23%
water: 12%
which cells are found in the cementum
cementoblasts and cytes
make cementum
cementoblasts
entrapped cementoblasts in cementum being produced
cementocytes
ground substance of cementum
proteoglycans
what shapes the root?
hertwig sheath begins to grow down after crown formation is complete
(cementum) which root sheath induces the formation of root dentin
inner root sheath
for cementum: the sheath breaks down to form the _____
epithelial rests of malassez
what induces the differentiation of cementoblasts from the dental follicle to begin secretion of cementoid- which leads to the apposition of cementum over dentin(DCJ is formed)
cells of the dental follicle contacting new dentin
very little cementum is deposited on the developing root until
tooth reaches functional occlusion
how much of root has been formed when tooth erupts
2/3
two groups of fibers found in cementum:
extrinsic collagen fibers and intrinsic collagen fibers
aka sharpeys fibers; uncalcified fibers form pdl and are partially inserted into outer cementum at right angles(90); dental follicle produce these fibers
extrinsic collagen fibers
non pdl fibers produced by cementoblasts and run parallel to DCJ
intrinsic collagen fibers
acellular cementum is made:
made first; primary
located near cervical half of tooth-closer to CEJ; no embedded cementocytes in lacunae; forms slower; not increase during life of tooth; greater calcified than cellular
acellular cementum
contains cementocytes trapped in lacunae due to fast rate of production
cellular ; secondary; less calcified
located near apical portion of tooth; depositied throughout life of tooth; depositied at intervals– producing arrest lines; highly calcified lines similar to those seen in bone–growth rings of a tree( incremental lines of cementum
cellular cementum
occurs when resorption stops and cementum deposition begins; reflects remodeling or cementum; cen occur when associated with orthodontic movement or trauma to the teeth
reversal lines
small, abnormal calcified bodies occasionally found in the pdl; result of apposition of cementum around cellular debris in the pdl; found attached to cementum, free pdl, or embedded in cementum of root
cementicles
can present some clinical problems in differentiation from calculus
cementicles
near CEJ; symmetrical spheres of cementum attached to cemental root surface(similar to enamel pearls)
cemental spurs
local abnormal thickening of parts of the cememtum; apical region
hypercementosis
hypercementosis can be seen in cases of:
chronic inflammation of the tooth; loss in an opposing tooth; tooth becomes fused to the surrounding alveolar bone proper
there are how many types of CEJ relationships that can occur during the development of the tooth
3
percentage of cementum meets the enamel edge to edge
52%
percentage of cementum overlaps a small part of the enamel
15%
percentage of cementum and enamel do not meet, exposing dentin; patient may experience dentinal hypersensitivity
33%