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Perio Lecture Series > 2 - Cementum > Flashcards

2 - Cementum Flashcards

1
Q

Function of cementum

A

Attachment of PDL fibers to tooth surface

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2
Q

Similarity to bone in terms of type

A

Laminated

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3
Q

Vascular (Y/N)

A

No

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4
Q

Innervated (Y/N)

A

No

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5
Q

Lymphatics (Y/N)

A

No

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6
Q

Organic and inorganic %’s

A

50% organic, 50% inorganic

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7
Q

Cementum mineral %

A

61%

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8
Q

Cementum organic matrix %

A

27%

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9
Q

Cementum water %

A

12%

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10
Q

Bone mineral %

A

45%

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11
Q

Bone organic matrix %

A

30%

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12
Q

Bone water %

A

25%

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13
Q

Cementum inorganic content and ions

A

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

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14
Q

Rate of cementum deposition

A

1.5-3.0u/year

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15
Q

Collagen type and %’s

A

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

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16
Q

ECM proteins

A

Glycolipids
Glycoproteins
Proteoglycans
“Others”

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17
Q

Glycoprotein examples

A

Fibronectin

Tenascin

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18
Q

“Others” proteins

A 
Bone sialoprotein
Osteonectin
Osteopontin
Osteocalcin
Dentin matrix protein
Cementum growth factors
Enamel proteins
Cementum attachment protein
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19
Q

Dental papilla turns into ____

A

Crown and root dentin

Pulp

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20
Q

Dental follicle turns into _____

A

Cementoblasts
PDL fibroblasts
Osteoblasts

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21
Q

HERS disintegrates into _____

A

Epithelial rests of Malassez

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22
Q

Origin of cementoblasts

A

Ectomesenchyme of dental follicle

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23
Q

AEFC formed by ____

A

HERS-derived cells

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24
Q

CIFC formed by ____

A

Dental follicle cells

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25
Q

Later origin of cementoblasts

A

Undifferentiated mesenchymal cells (PDL)

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26
Q

Cementocytes found in _____ cementum and up to ____ microns

A

Cellular

60

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27
Q

Cementoclasts origin

A

Bone marrow

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28
Q

Coronal cementum characteristics

A

Acellular, afibrillar

Fine HA

29
Q

2 types of radicular cementum

A

Acellular fibrillar

Cellular fibrillar

30
Q

AFC location
Type of collagen
Thickness
Sharpey calcification

A

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

31
Q

CFC location
Thickness
Sharpey calcification

A

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

32
Q

4 types of Schroeder Cementum

A

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

33
Q

AAC location and significance

A

Coronal over enamel and dentin

No function in humans

34
Q

AEFC same as ____

A

Primary cementum (prefunctional)

35
Q

AEFC location and % root coverage

A

Cervical and middle 1/3 of root

40-70% of root surface

36
Q

AEFC deposition rate

Slow/fast?

A

5-7u/day

Slowly and continuously. Shows resting lines

37
Q

AEFC purpose

A

Tooth anchorage

38
Q

CMSC location

A

Apical 1/3 of root and furcation

39
Q

CMSC 2 types

A

CIFC

AEFC

40
Q

CMSC thickness

A

100-600um

41
Q

CIFC same as _____

A

Secondary cementum

42
Q

CIFC location

A

Apical, furcation

43
Q

CIFC deposition rate

A

Fastest, less mineralized than AEFC

44
Q

Coronal cementum thickness

A

20-50um

45
Q

Apical cementum thickness

A

150-200um

46
Q

Thickness increases by how much over lifetime?

According to who?

A

3x

Zander

47
Q

Thicker cementum in posterior teeth on mesial or distal?

A

Distal

48
Q

CEJ anatomy %’s (3 types)

A

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

49
Q

CEJ anatomy according to who?

A

Thorsen 1917

50
Q

Most common location CEP

A

Mandibular molar furcation

51
Q

Prevalence of CEPs in Caucasians

Higher in what population?

A

10-33%

Asians

52
Q

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

According to who?

A

45.7%

Blanchard 2012

53
Q

Mean diameter enamel pearl

A

1.7mm

54
Q

Enamel pearl prevalence of _____ on ______

A

2.69%

Permanent molars

55
Q

Common sites of enamel pearls

A

Maxillary 2nd and 3rd molars

56
Q

Disease w/ cementomas

A

Periapical cemental dysplasia

57
Q

Disease w/ sclerosing cemental masses

A

Florid osseous dysplasia

58
Q

Disease w/ generalized hypercementosis

A

Paget’s disease

59
Q

Disease w/ absence of cementum

A

Hypophosphatasia

60
Q

Disease w/ thin cementum + palmar/plantar hyperkeratosis

A

Papillon-Lefevre syndrome

61
Q

Characteristics of Gardner’s syndrome (5)

A 
Hypercementosis
Osteomas
Supernumerary teeth
Polyposis of large intestine
Epidermoid cysts
62
Q

Diseases w/ cementum hypoplasia (4)

A

Hypophosphatasia
AgP
Papillon-Lefevre syndrome
Leukocyte Adhesion Defect

63
Q

Location of root resorption in molars

A

Apical 1/3

64
Q

Diameter and depth of root resorption

A

1mm

100um

65
Q

Type of cementum that repairs root resorption

A

CIFC

66
Q

Cemental tears etiology

A

Occlusal trauma

67
Q

Depth of bacterial penetration into dentin

A

300um

68
Q

____% of endotoxin removed by brushing

According to who?

A

60%

Moore

Perio Lecture Series (7 decks)

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