QUIZ 4 REVIEW

Question 1

Which theory asserts that nerves extend to the dentinoenamel junction?

Answer 1

The direct innervation theory is based on the belief that nerves extend to the dentinoenamel junction

Question 2

What does the transduction propose?

Answer 2

The transduction theory proposes that odontoblastic processes conduct pain to nerve endings.

Question 3

What does the hydrodynamic theory propose?

Answer 3

The hydrodynamic theory asserts that when dentin is stimulated, fluid moves within the tubules. (movement of odontoblasts that come into contact with pulpal and intratubular nerve endings))

Question 4

What does the pain transduction theory propose?

Answer 4

Pain transmission theories include transduction, hydrodynamic, and direct innervation theories.

Question 5

What is the shape of radicular pulp?

Answer 5

Tapered or conical and becomes smaller with age.

Question 6

What does the central zone contain?

Answer 6

Arterials, nerves, vein trunk that enter from apical to canal to coronal pulp chamber.

Question 7

What is the most predominent cell?

Answer 7

Fibroblasts

Question 8

What is the second most predominant cell?

Answer 8

Odontoblasts

Question 9

What are accessory canals a result of?

Answer 9

The presence of blood vessels obstructing denting formation or from a break in the epithelial root sheath that induces initial root formation.

Question 10

Where are accessory canals found?

Answer 10

Lateral sides of apical region. 33% of permanent teeth.

Question 11

What shape cell appears in radicular pulp

Answer 11

cuboidal

Question 12

What are Schwann cells?

Answer 12

Nerve cells in the pulp that form mylenin sheath and are associated with all pulp nerves.

Question 13

What are endothelial cells?

Answer 13

lining of capillaries, veins, and arteries of pulp.

Question 14

What are undifferentiated cells

Answer 14

Function when new odontoblasts or fibroblasts are needed. repairative

Question 15

What is the diameter of arteries/

Answer 15

50-100mm

Question 16

What are the three vessels layers?

Answer 16

Inner lining (intima), oval squamous shaped endothelial cells, surrounded by fibrilar basil lamina.

Question 17

The parental layer of nerves?

Answer 17

Plexus of Rasschkow mylenated/nonmylenated axons

Question 18

What are pulp stones?

Answer 18

Pulp stones, that are round to oval calcified masses in canal or corona portions that are caused by trauma. Permanent teeth 50+years

Question 19

What are true denticles?

Answer 19

True denticles have dental tubules like dentin and may have odontoblasts on surface.

Question 20

What are false denticles?

Answer 20

Concentric layers of falsified tissues that have a necrotic center. Serve as nidus of tentacle formation.

Question 21

What are the three denticle classifications?

Answer 21

Free, attached, embedded. ( most are false stones that are free in pulp)

Question 22

What are the two types of hard tissue that cover tooth roots?

Answer 22

INTERMEDIATE CEMENTUM-homogenous layer originating from inner epithelial root sheath cells. CELLULAR/ACELLULAR CEMENTUM-thicker deposit of bone-like substance produced by cementoblasts differentiate from the PDL fibroblasts.

Question 23

Where is intermediate cementum situated?

Answer 23

Between granular layer of tomes and secondary cementum that is formed by cementoblasts.

Question 24

What does cementum not contain?

Answer 24

Blood vessels, nerves, haversian or volkomm canals.

Question 25

What does aging cementum display?

Answer 25

Projections of cemental spikes into ligament.

Question 26

True/False? Cementum is deposited in increments that result in incremental lines?

Answer 26

True

Question 27

True/False? With aging cementum becomes more irregular?

Answer 27

True! Due to calcification of ligament fiber bundles.

Question 28

Cementicles are ovoid or round nodules found in the PDL and are singly or in groups-True or False?

Answer 28

True