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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
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

Perio Lecture Series (7 decks)

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