Njds: Histology - Cementum

Front 1

What is cementum?

Back 1

The hard tissue that covers the roots of the teeth and provides a partial anchor for the periodontal ligament.

Front 2

What is the cementum derived from?

Back 2

The dental follicle.

Front 3

What are the 2 major types of cementum? Describe.

Back 3

Acellular--provides attachment for the periodontal ligament.

Cellular--contains cementocytes. Formed in response to minor persistent trauma and/or tooth wear.

Front 4

Which type of cementum provides attachment for the periodontal ligament?

Back 4

Acellular

Front 5

Which type of cementum contains cementocytes?

Back 5

Cellular

Front 6

Which type of cementum is formed in response to minor persistent trauma and/or tooth wear?

Back 6

Cellular

Front 7

What criteria is used to subclassify cementum?

Back 7

Time of formation (primary vs secondary)

Presence of cementocytes (acellular vs cellular)

Origin of collagen (intrinsic vs extrinsic)

Front 8

Where does intrinsic collagen originate? Extrinsic?

Back 8

Intrinsic--From the cementoblast

Extrinsic--From the PDL fibroblast

Front 9

Describe primary acellular intrinsic fiber cementum.

Back 9

1.Earliest formed cementum

2.Deposited prior to PDL formation

3.Serves an anchoring function.

Front 10

Describe primary acellular extrinsic fiber cementum.

Back 10

1.Produced through the incorporation of PDL fibers

2.Serves an anchoring function

Front 11

Describe secondary cellular intrinsic fiber cementum.

Back 11

1.Contains cementocytes in lacunae

2.Contributes little to the PDL attachment

3.Serves an adaptive purpose

Front 12

Describe secondary cellular mixed fiber cementum.

Back 12

1.This is the majority of secondary cementum

2.Encloses PDL fibers

3.Has cementocytes and is laminated
4.Surface layer is cementoid

Front 13

Describe acellular afibrillar cementum.

Back 13

1.Has no function and is considered an anomaly.

2.Seen only on enamel surface as a thin extension of the root cementum or as a small isolated patch near the CEJ.

Front 14

Describe intermediate cementum.

Back 14

1.Has no function

2.A type of secondary cellular intrinsic fiber cementum near the apical foramen.

3.Contains entrapped cellular elements.

Front 15

Describe mixed stratified cementum.

Back 15

An alternation of layers of acellular intrinsic and cellular intrinsic fiber cementum present at the apex. Could be an adaptational function.

Front 16

Regarding the following CEJ conditions, which occur most frequently, and which occur least frequently?

Teeth showing cementum and enamel meeting head to head.

Teeth showing cementum overlapping enamel.

Teeth showing a gap between cementum and enamel.

Back 16

Historically, 60% of teeth show cementum overlapping enamel, 30% of teeth show the two tissues meeting head to head, and 10% of teeth show a gap. However, these conditions can be found in all teeth.

Front 17

Which subtype(s) of cementum contains the earliest formed cementum?

Back 17

Primary acellular intrinsic fiber cementum.

Front 18

Which subtype(s) of cementum serves an anchoring function?

Back 18

Primary acellular intrinsic AND extrinsic fiber cementum.

Front 19

Which subtype(s) of cementum contain cementocytes?

Back 19

Secondary cellular intrinsic , intermediate cementum, and mixed fiber cementum.

Front 20

Which subtype(s) of cementum contains a surface layer of cementoid?

Back 20

Secondary cellular mixed fiber cementum.

Front 21

Which subtype(s) of cementum serve no function?

Back 21

Acellular afibrillar cementum and intermediate cementum.

Front 22

Which subtype of cementum demonstrates an alternation of layers?

Back 22

Mixed stratified cementum.

Front 23

Secondary Cementum is comprised mostly of which subtype?

Back 23

Secondary cellular mixed fiber cementum.

Front 24

Which subtype of cementum encloses the PDL fibers?

Back 24

Secondary cellular mixed fiber cementum.