pulp

Question 1

four distinct zone of pulp

Answer 1

1. odontoblastic zone (at the pulp periphery)
2. cell free zone (prominent in coronal pulp)
3. cell rich zone ( coronal pulp adjacent to cell free zone)
4. . pulp core (major vessels and nerves of pulp)

Question 2

principal cells of pulp

Answer 2

odontoblast, fibroblast, undifferentiated ectomesenchymal, macrophages, and some immunocompetent cells

Question 3

odontoblast correspond to?

Answer 3

dentinal tubules and depends the the tooth and the location of the tooth

Question 4

odontoblast in crown and root

Answer 4

in crown they are large columnar and 50 micrometer, midportion of pulp they are cuboidal and apical root they are flattened

Question 5

tubular fluid contents are

Answer 5

proteoglycans, fibronectin, tenascin and serum proteins which are albumin, HS glycoprotein and transferrin

Question 6

cells occurring in greatest number in pulp are

Answer 6

fribroblast

Question 7

fibroblast are found in

Answer 7

coronal pulp at the cell rich zone

Question 8

function of fibroblast

Answer 8

form and maintain the pulp matrix which consist of collagen and ground substance

Question 9

in young pulp fibroblast are

Answer 9

actively secreting pulp matrix, plump cytoplasm with all the organelles and

Question 10

with age what happens to fibrblast

Answer 10

the need for synthesis diminish, they become spindle shaped with dense nuclei,

Question 11

function of undifferentiated mesenchyme

Answer 11

they secrete the connective tissue of the pulp, depending on the stimulus they can also secrete odontoblast and fibroblast

Question 12

where undifferentiated mesenchyme cells found

Answer 12

cell rich zone and pulp core

Question 13

what happens in older pulps,

Answer 13

number of undifferentiated mesenchymal cells diminish including other pulp core cells, and this reduces the regenerative property of pulp along with other age factors.

Question 14

inflammatory cells of pulp

Answer 14

they have macrophages, t lymphocytes some b lymphocytes and some leukocytes
they also have bone marrow derived antigen presenting dendritic cells

Question 15

collagen fibers present in pulp and mostly found where and how it is chkowof clinical impact

Answer 15

collagen type I AND III
mostly found in the apical region
when pulpectomy is done in endodontic treatment, the barbed broach should be engaged in the apex rather than the coronal portion where the pulp is gelatinous and liable to tear

Question 16

ground substances contans

Answer 16

glycosaminoglycans, glycoproteins and water

Question 17

alternation in composition of ground substance causes

Answer 17

interfere with function, producing metabolic changes, reduced cellular function and irregularities in mineral deposition

Question 18

sunodontoblastic plexus of raschkow

Answer 18

nerves in pulp chamber follow the course of afferent arteries, then branch off periphery as they extend oclusally in the pulp core, these nerves make a plexus of nerves in the cell free zone of weil beneath the odontoblast and this plexus is know as sub odontoblastic plexus of raschkow

Question 19

nerve bundles entering pulp contains what nerves

Answer 19

sensory afferent nerves of trigeminal (fifth cranial nerve) sympathetic branches from superior cervical ganglion

Question 20

3 points that explain dentinal sensitivity

Answer 20

1. dentine has nerve endings that are stimulated by a stimulus
2. odontoblast serve as receptors that are coupled with nerves in pulp
3. tubular nature of dentine permits fluid to flow in the tubules when stimulus is applied.

Question 21

hydronamic hypothesis is

Answer 21

fluid movement through the tubules disrupts the pulpal environment, and sensed by free nerve endings in the plexus of raschkow

Question 22

what are pulp stones

Answer 22

calcified max containing calcium-phosphorus maybe singular or multiple found on the orifice or root canal

Question 23

histologically pump stones have

Answer 23

concentric layer of mineralized tissue formed by surface accretion around thombi, dying or dead cells or collagen fibers.

Question 24

significance of pulp stones

Answer 24

they are a hindrance for treating pulp diseases during endodontic treatment because they decrease the overall number of cells in pulp