Cementum

Question 1

Cementum is _____ % mineral

Answer 1

45-50%

Question 2

Cementocyte ____ are spaces occupied by cell

Answer 2

Lacunae

Question 3

The excessive production of cellular
cementum that generally involves the apical 1/3 of the root.
Etiology is variable involving such factors as trauma from
occlusion, periapical inflammation, or compensation for occlusal
attrition.

Answer 3

Hypercementosis:

Question 4

Is cementum designed to be exposed?

Answer 4

No

Question 5

____ are mineralize cementum

Answer 5

Cementocytes

Question 6

Cementum is ____ % organic

Answer 6

50-55%

Question 7

Cementum get more _____ as it moves down the root

Answer 7

Cellular

Question 8

Loss by wear of dental tissue caused
by foreign substance (e.g. toothbrush)
Usually located at cervical areas of teeth
Lesions are more wide than deep
Premolars and cuspids are commonly affected

Answer 8

Abrasion

Question 9

____ is loss of tooth by chemical processes; not bacterial

Answer 9

Erosion

Question 10

____ and ____ lines are growth lines from the crown to apex; Both indicate incremental
growth, and run longitudinally
within the cementum

Answer 10

Depositional and reversal lines

Question 11

Exposed cementum facilitates

attachment of ____ and _____

Answer 11

plaque and

calculus

Question 12

Loss of tooth surface at the cervical areas of teeth caused by
tensile and compressive forces during tooth flexure
Affects buccal/labial cervical areas of teeth
Deep, narrow V-shaped notch
Commonly affects single teeth with excursive interferences or
eccentric occlusal loads

Answer 12

Abfraction

Question 13

Exposed cementum is
_____ which
prevents reattachment of
collagen.

Answer 13

hypermineralized

Question 14

What is cementum’s embryological origin?

Answer 14

Neural crest cells

Question 15

____ tooth to tooth wear

Answer 15

Attrition

Question 16

Cementocyte ____ are spaces occupied by cytoplasmic projections; possible linkage to intercellular communication

Answer 16

Canaliculi

Question 17

contains less mineral than both
 bone and dentin.
 Unlike bone, it is avascular, not
innervated, and contains no Haversian or
Volkmann’s canals.
  thinnest at the CEJ (30-50 µm)
 and progressively increases in thickness to 90-
 150 µm at mid-root to 150-300 µm at the apex.

Answer 17

Cementum

Question 18

Calcified bodies appearing on or in the cementum
and in the PDL. Classified as free, attached or embedded.
These are a response to local trauma or hyperactive
occlusion and appear in increasing numbers with increasing age.

Answer 18

Cementicle:

Question 19

Cementum is thickest at _____

Answer 19

apex

Question 20

Differentiation of _____ is initiated with disruption of Hertwig’s
epithelial root sheath, allowing the undifferentiated
mesenchymal cells to make contact with the adjacent dentin.
Dentin matrix growth factors (e.g., BMP, FGF, DMP) then
induce the differentiation process.

Answer 20

Cementoblasts

Question 21

Cementum is thinnest at _____

Answer 21

CEJ

Question 22

____ are the cells responsible for secretion of the
organic matrix of cementum, are derived from undifferentiated
mesenchymal cells that originate in the proximal (inner) zone
of the dental follicle. In turn, all cells in the dental follicle are
derived from ectomesenchyme (neural crest cells)

Answer 22

Cementoblasts,

Question 23

Organic components of \_\_\_\_\_ include:
• Type I collagen (intrinsic and Sharpey’s fibers)
• Proteoglycans
• Glycosaminoglycans
• Phosphoproteins

Answer 23

cementum

Question 24

Exposed cementum facilitates

_____ absorption

Answer 24

endotoxin

Question 25

____ can get growth factors from interstitial spaces of PDL thru these

Answer 25

Accessory canals

Question 26

____ fibers are PDL fibers attached to cementum

Answer 26

Sharpey's fibers

Question 27

``` Provides attachment for the PDL  May provide limited compensation for occlusal wear through continuous apical apposition  May participate in repair of root fracture ```

Answer 27

Cementum