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Perio Exam 1 > Lecture 2 > Flashcards

Lecture 2 Flashcards

(52 cards)

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1
Q

what is the origin of junctional epithelium during tooth eruption?

A

reduced dental epithelium

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2
Q

what is the origin of junctional epithelium after tooth eruption?

A

the cells of oral epithelium possess the ability to differentiate into cells of junctional epithelium

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3
Q

what is the structure of junctional epithelium?

A

widest in coronal portion (15-20 cell layers), thin towards the CEJ (3-4 cells)

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4
Q

does the junctional epithelium turnover?

A

yes- turnover rate faster than oral epithelium

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5
Q

does the junctional epithelium or oral epithelium have bigger size of cells?

A

junctional epithelium

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6
Q

does the junctional epithelium or oral epithelium have bigger size of intercellular space?

A

junctional epithelium

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7
Q

does the junctional epithelium or oral epithelium have bigger number of desmosomes?

A

oral epithelium

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8
Q

does the junctional epithelium or oral epithelium have potential to keratinize?

A

junctinal epithelium

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9
Q

how does junctional epithelium contact the tooth?

A

junctional epithelium is physically attached to the tooth, not simply in contact with it

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10
Q

when does periodontitis occur?

A

when junctional epithelium migrates apically down root surface

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11
Q

what is necessary for pocket formation?

A

viable junctional epithelium

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12
Q

what happens in necrotizing ulcerative periodontitis?

A

junctional epithelial cells die, so no pocketing

bone exposed

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13
Q

what is cal?

A

pocket depth+gingival recession

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14
Q

what cells are present in gingival connective tissue (lamina propria)?

A 
fibroblasts- synthesizes matrix and fibers
mast cells- vasoactive substances
macrophages- phagocytosis and synthesis
neutrophillic granulocytes
lymphocytes
plasma cells
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15
Q

what fibers are present in the gingival connective tissue?

A

collagen, reticulin, oxytalan, elastic

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16
Q

what do collagen fibers do?

A

characteristic cross banding

produced by fibroblasts, cementoblasts, and osteoblasts

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17
Q

what fibers are most abundant in gingival connective tissue?

A

collagen fibers

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18
Q

where are the reticulin fibers?

A

numerous adjacent to basement membrane

around blood vessels

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19
Q

where are the oxytalan fibers?

A

mostly in pdl

run parallel to long axis of tooth

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20
Q

where are the elastic fibers?

A

around blood vessel

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21
Q

what are the functions of the gingival fibers?

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A

reinforce the gingiva
provide resilience and tone
maintain architectural form and integrity

22
Q

where are the circular fibers?

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A

encircle tooth like a cuff

23
Q

where are the dentogingival fibers?

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A

fan out from supra-crestal cementum into free gingiva

24
Q

where are the dentoperiosteal fibers?

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A

run from supracrestal cementum into attached gingiva

25
where are the transseptal fibers?
run from tooth to tooth (embedded in cementum)
26
what is the structure of periodontal ligament?
richly vascular and cellular connective tissue surrounding the roots and joining cementum and alveolar bone
27
what is the radiographic view of pdl?
the space between lamina dura (alveolar bone proper) and root surface hourglass shape space 0.25 mm width
28
what are the functions of pdl?
permits forces to be distributed | essential for tooth mobility
29
what are the principal fibers of pdl?
alveolar crest fibers horizontal fibers oblique fibers apical fibers
30
what are the cells of pdl?
fibroblasts, osteoblasts, cementoblasts, osteoclasts, epithelial cells, nerve fibers, epithelial cell rests of mallassez
31
where are the fibroblasts?
aligned along principal fibers
32
where are the osteoblasts?
line bone surface
33
where are the cementoblasts?
line cemental surface
34
where are the osteoclasts?
multinucleated, create ruffled surface of bone
35
what is cementum?
mineralized tissue covering tooth surface and occasionally small portions of the crown of the teeth
36
how is cementum different from bone tissue?
no blood vessels no lymph vessels no innervation no physiologic resorption/remodeling
37
what are the other characteristics of cementum?
continuing deposition throughout life collagen fibers embedded in organic matrix high mineral content (65%), mainly HA
38
what are the intrinsic cemental fibers?
produced by cementoblasts | composed of fibers oriented parallel to root
39
what are the extrinsic fibers?
sharpey's fibers | produced by pdl fibroblast
40
what are the different forms of cemental fibers?
acellular, extrinsic fiber cementum- coronal or middle portion of the root cellular, mixed stratified cementum- apical third of the root and in the furcations cellular, intrinsic fiber cementum- in resorption lacunae
41
what happens to cemental thickness throughout life?
increases by gradual apposition
42
what is the cementum thickness in cervical portion of the root?
20-50um
43
what is the cementum thickness in apical portion of the root?
150-250 um
44
what does the alveolar bone consist of?
bone formed by both dental follicle and cells independent of tooth development
45
what are the parts of alveolar bone?
cancellous bone, cortical bone, bone marrow
46
what does the bone marrow consist of?
adipocytes, vascular structures, undifferentiated mesenchymal cells
47
does the alveolar bone remodel?
remodels in response to forces and tooth movement
48
how is the alveolar bone made?
osteoblasts produce bone matrix (osteoid) consisting of collagen fibers, glycoproteins, and proteoglycans osteoid undergoes mineralization by the deposition of minerals (calcium and phosphate)
49
what is the blood supply to gingiva?
``` supraperiosteal vessels- terminal branches of sublingual buccal mental facial greater palatine infraorbital posterior superior dental ```
50
what is the blood supplot to periodontal tissues?
dental artery superior/inferior alveolar intra-septa rami perforantes (terminal branches of intra-septal, penetrate alveolar bone all through the socket)
51
lymphatic system
submental lymph nodes deep cervival lymph nodes submandibular lymph nodes jugulodigastric lymph node
52
what are the nerves of the periodontium?
``` end branches of trigeminal nerve: infraorbital sublingual posterior superior dental mental greater palatal buccal long sphenopalatine ```

Perio Exam 1 (6 decks)

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