exam 2: cementum

Question 1

cementum is 50-55%:
45-50%:

Answer 1

50-55 organic
45-50 mineral

50/50 split basically

Question 2

organic compounds in cementum include

Answer 2

type I collagen
proteoglycans
glycosaminoglycans
phosphoproteins

Question 3

cementum provides attachment to the:

and participate in repair of ____ fracture

Answer 3

PDL

root fracture

Question 4

cementum provides limited compensation for ________ through continuous apical apposition

Answer 4

occlusal wear

Question 5

cementum contains less (mineral/organic) than both bone and dentin

Answer 5

less mineral

Question 6

unlike bone, cementum is __________ and contains no haverian or volkmann’s canal

Answer 6

avascular/not innervated

Question 7

cementum is thinnest at_________
and increases thickness at the ________ and even more at __________

Answer 7

thinnest at CEJ< mid-root<apex

Question 8

cells responsible for secretion of organic matrix of cementum are derived from undifferentiated mesenchymal cells that originate in proximal (inner) zone of dental follicle

Answer 8

cementoblasts

-all cells in dental follicle are derived from neural crest cells aka ectomesenchyme

Question 9

differentiation is initiated with disruption of ___________ allowing the undifferentiated mesenchymal cells to make contact with the adjacent dentin
-dentin matrix growth factors (BMP, FGF, DMP) then induce the differentiation process

Answer 9

hertwig’s root sheath

Question 10

both indicate incremental growth and run longitudinally within cementum

Answer 10

depositional lines and reversal lines

Question 11

cementocytes.

1. space occupied by cell=
2. space occupied by cytoplasmic projections

Answer 11

cell=lacunae

cytoplasmic projections= canaliculi (lines)

Question 12

PDL fibers passing into acellular cementum

Answer 12

sharpey’s fibers

Question 13

loss of tooth surface at the cervical areas of teeth caused by tensile and compressive forces during tooth flexure

Answer 13

abfraction

Question 14

abfraction affects these two cervical areas of teeth

Answer 14

buccal and labial

Question 15

deep narrow v shaped notch in teeth and common affects single teeth with excursive interferences or eccentric occlusal lodds

Answer 15

abfraction

Question 16

loss by wear of dental tissue caused by foreign substance (toothbrush)
-lesions are more wide than deep

Answer 16

abrasion

Question 17

with abrasion, what areas of teeth are affected and what teeth in generally are commonly affected

Answer 17

cervical areas

premolars and cuspids

Question 18

calcified bodies appearing on or in the cementum and in the pdl
-classified as free, attached or embedded

-response to local trauma or hyperactive occlusion and appear in increasing number with increasing age

Answer 18

cementicle

Question 19

exposed cementum is hypermineralized which prevents:

Answer 19

reattachment of collagen

Question 20

exposed cementum facilitates attachment of _____ and______

Answer 20

plaque and calculus

Question 21

exposed cementum facilitates _____ absorption

Answer 21

endotoxin absorption

Question 22

excessive production of cellular cementum that generally involves apical 1/3 of root

-can be from trauma of occlusion, periapical inflammation, attrition

Answer 22

hypercementosis

Question 23

how roots can repair

Answer 23

accessory canals

more apical you go the more canals you have

Question 24

allow for vascular tissues to reach apical mineralized tissues

(if have crack these can help with repair)

mainly found:

Answer 24

accessory canals

mainly found in furcation