Biology & Histology of Pulp and PA Tissues

Question 1

Pulpal organ:

Answer 1

Central mass of a tooth consisting of soft tissue that
is densely innervated by afferent (sensory) fibers, sympathetic fibers,
vascular structures, lymphatics and specialized cells such as
odontoblasts (characteristic cells of pulp) and fibroblasts

Question 2

most common/prevalent cell type in pulp

Answer 2

fibroblasts

Question 3

Pulpal organ
Primary Function:

Answer 3

Formative: odontoblasts – dentin
(with dental epithelium) ameloblasts –
enamel

Question 4

Pulpal organ
Secondary Functions: (4)

Answer 4

Supportive
Protection, Sensation, Defense, Repair

Question 5

Fibroblast arises from

Answer 5

undifferentiated
ectomesenchymal cell

Question 6

Most prevalent cell in the
pulp organ

Answer 6

Fibroblast

Question 7

Fibroblast
■ In wound —!

Answer 7

healing

Question 8

basic cell in all connective tissue

Answer 8

Fibroblast

Question 9

Fibroblast
Important in

Answer 9

Pulpal
Regeneration

Question 10

Cell unique to the pulp

Answer 10

Odontoblast

Question 11

Odontoblast
Responsible for

Answer 11

dentinogenesis

Question 12

Odontoblast
– Important in

Answer 12

amelogenesis

Question 13

Odontoblast
Produces collagen fiber
and proteoglycan matrix
which becomes

Answer 13

mineralized
– Processes extend into tubules

Question 14

Branstromm’s“Hydrodynamic
Theory”

Answer 14

Anything that causes
movement of the fluid w/in
the dentinal tubules causes
pain in the pulp

Question 15

The FUNCTION of
odontoblasts is to

Answer 15

create tooth

Question 16

Note the uniform deposition of — DENTIN reducing the general
size of the pulp but retaining the general form as the tooth matures.

Answer 16

SECONDARY

Question 17

TERTIARY (REPARATIVE) DENTIN

Answer 17

is deposited over time in the immediate area of the injury
by fibroblasts in an attempt to repair, protect or insulate the pulp from further injury.
General FORM of PULP is altered.

Question 18

Calcific Metamorphosis

Answer 18

Pulp sclerosis or Dystrophic calcification,

Question 19

PCO:

Answer 19

pulp canal obliteration

Question 20

PCO
• Probably a combination of

Answer 20

2ndary and Terti:ary dentin formation in response
to extensive and chronic injuries before the pulp became necrotic. (no
deposition unless pulp is vital)

Question 21

Common etiologies of Pulp irritation
(4)

Answer 21

• Microbiological
• Mechanical
• Chemical
• Trauma

Question 22

The pulp amazingly resilient if covered
by at least — of healthy dentin.
Reasonable trauma can be survived if
bacteria are minimized or eliminated.

Answer 22

.5mm

Question 23

Many of the etiologies of
pulpal damage are —.

Answer 23

IATROGENIC

Question 24

The #1 cause of pulpal injury

Answer 24

Microbiological

Question 25

Kakehashi exposed pulps of
germ free and conventional
rats to their own flora.
The gnotobiotic rats…

Answer 25

did not
develop pulpal or
periradicular lesions.*

Question 26

The #1 threat to health of the dental pulp
is :

Answer 26

DENTAL CARIES

Question 27

“Portals of ACCESS” of microbiological irritants (5)

Answer 27

Caries/leaking Restoration
Cracked or fractured tooth
Cemental defect @ CEJ
Open dental tubules
Perio invasion into apex

Question 28

Bacteria are — um
Tubules are — um

Answer 28

0.2 to 5
50

Question 29

Most operative procedures are
accompanied by significant opportunity for

Answer 29

iatrogenic and irreversible damage to the
pulp.

Question 30

• CUTTING WITH
INSUFFICIENT COOLANT
CAUSES:

Answer 30

• Aspiration of odontoblasts into
tubules

Question 31

If beyond limits of repair =

Answer 31

Pulp Necrosis. 10ºC

Question 32

Mechanical Irritants (5)

Answer 32

Excessive air drying of exposed dentin: aspiration
Application of desiccants: alcohol, chloroform, Cavit etc.
Pulp exposure
Polishing
Use of laser

Question 33

EXTERNAL:

Answer 33

Falls & Sports
Accidents

Question 34

INTERNAL:

Answer 34

Para-Normal
Habits (Bruxism)