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Flashcards in 2 - Cementum Deck (68):
1

Function of cementum

Attachment of PDL fibers to tooth surface

2

Similarity to bone in terms of type

Laminated

3

Vascular (Y/N)

No

4

Innervated (Y/N)

No

5

Lymphatics (Y/N)

No

6

Organic and inorganic %'s

50% organic, 50% inorganic

7

Cementum mineral %

61%

8

Cementum organic matrix %

27%

9

Cementum water %

12%

10

Bone mineral %

45%

11

Bone organic matrix %

30%

12

Bone water %

25%

13

Cementum inorganic content and ions

HA + Magnesium, fluoride, sulfur, and trace Cu, Zn, Na

14

Rate of cementum deposition

1.5-3.0u/year

15

Collagen type and %'s

Type I - 90%
Type III - 5%
Type XII - trace

16

ECM proteins

Glycolipids
Glycoproteins
Proteoglycans
"Others"

17

Glycoprotein examples

Fibronectin
Tenascin

18

"Others" proteins

Bone sialoprotein
Osteonectin
Osteopontin
Osteocalcin
Dentin matrix protein
Cementum growth factors
Enamel proteins
Cementum attachment protein

19

Dental papilla turns into ____

Crown and root dentin
Pulp

20

Dental follicle turns into _____

Cementoblasts
PDL fibroblasts
Osteoblasts

21

HERS disintegrates into _____

Epithelial rests of Malassez

22

Origin of cementoblasts

Ectomesenchyme of dental follicle

23

AEFC formed by ____

HERS-derived cells

24

CIFC formed by ____

Dental follicle cells

25

Later origin of cementoblasts

Undifferentiated mesenchymal cells (PDL)

26

Cementocytes found in _____ cementum and up to ____ microns

Cellular
60

27

Cementoclasts origin

Bone marrow

28

Coronal cementum characteristics

Acellular, afibrillar
Fine HA

29

2 types of radicular cementum

Acellular fibrillar
Cellular fibrillar

30

AFC location
Type of collagen
Thickness
Sharpey calcification

Cervical 1/2-2/3 root
Type 1, perpendicular to root
30-230um
Completed calcified SF

31

CFC location
Thickness
Sharpey calcification

Apical 1/3-1/2 of root, furcation
Thicker than AFC
Varied SF calcification

32

4 types of Schroeder Cementum

AAC - Acellular afibrillar cementum
AEFC - Acellular extrinsic fiber cementum
CMSC - Cellular mixed stratified cementum
CIFC - Cellular instrinsic fiber cementum

33

AAC location and significance

Coronal over enamel and dentin
No function in humans

34

AEFC same as ____

Primary cementum (prefunctional)

35

AEFC location and % root coverage

Cervical and middle 1/3 of root
40-70% of root surface

36

AEFC deposition rate
Slow/fast?

5-7u/day
Slowly and continuously. Shows resting lines

37

AEFC purpose

Tooth anchorage

38

CMSC location

Apical 1/3 of root and furcation

39

CMSC 2 types

CIFC
AEFC

40

CMSC thickness

100-600um

41

CIFC same as _____

Secondary cementum

42

CIFC location

Apical, furcation

43

CIFC deposition rate

Fastest, less mineralized than AEFC

44

Coronal cementum thickness

20-50um

45

Apical cementum thickness

150-200um

46

Thickness increases by how much over lifetime?
According to who?

3x
Zander

47

Thicker cementum in posterior teeth on mesial or distal?

Distal

48

CEJ anatomy %'s (3 types)

60-65% Cementum/enamel overlap
30% butt junction
5-10% gap between cementum and enamel

49

CEJ anatomy according to who?

Thorsen 1917

50

Most common location CEP

Mandibular molar furcation

51

Prevalence of CEPs in Caucasians
Higher in what population?

10-33%
Asians

52

Grape III CEPs on mandibular molars, what % covered with cementum

According to who?

45.7%

Blanchard 2012

53

Mean diameter enamel pearl

1.7mm

54

Enamel pearl prevalence of _____ on ______

2.69%
Permanent molars

55

Common sites of enamel pearls

Maxillary 2nd and 3rd molars

56

Disease w/ cementomas

Periapical cemental dysplasia

57

Disease w/ sclerosing cemental masses

Florid osseous dysplasia

58

Disease w/ generalized hypercementosis

Paget's disease

59

Disease w/ absence of cementum

Hypophosphatasia

60

Disease w/ thin cementum + palmar/plantar hyperkeratosis

Papillon-Lefevre syndrome

61

Characteristics of Gardner's syndrome (5)

Hypercementosis
Osteomas
Supernumerary teeth
Polyposis of large intestine
Epidermoid cysts

62

Diseases w/ cementum hypoplasia (4)

Hypophosphatasia
AgP
Papillon-Lefevre syndrome
Leukocyte Adhesion Defect

63

Location of root resorption in molars

Apical 1/3

64

Diameter and depth of root resorption

1mm
100um

65

Type of cementum that repairs root resorption

CIFC

66

Cemental tears etiology

Occlusal trauma

67

Depth of bacterial penetration into dentin

300um

68

____% of endotoxin removed by brushing

According to who?

60%

Moore