Junctional Epithelium Flashcards Preview

AU 15- Periodontology > Junctional Epithelium > Flashcards

Flashcards in Junctional Epithelium Deck (68):
1

During tooth eruption, the junctional epithelium is made up of ________ epithelium.

Reduced Dental Epithelium

2

After tooth eruption, cells of the _______ possess the ability to differentiate into cells of the junctional epithelium.

oral epithelium

3

At which location is the junctional epithelium widest?

in the coronal region (15-20 cell layers thick)

4

At which location is the junctional epithelium most narrow?

in the CEJ region (3-4 cell layers thick)

5

True or False: Junctional Epithelium is continuously renewed.

True

6

True or False: Turnover rate for oral epithelium is faster than junctional epithelium.

False: JE is faster

7

Compared to oral epithelium, the junctional epithelium has larger ____ and larger ______.

cells and intercellular space

8

The junctional epithelium has fewer _____ than the oral epithelium.

desmosomes

9

What is the significance in different numbers of desmosomes between JE and OE?

Fewer desmosomes means larger gaps in the JE. Neutrophils must be able to enter/leave through the JE

10

Which type of epithelium has the ability to keratinize, JE or OE?

Junctional Epithelium

11

True or False: The junctional epithelium is simply in contact with the tooth, not physically attached.

False; JE is attached

12

Why is it important to never probe sulcular pockets in children?

the JE sits much higher in children because passive eruption has not occured. The sulcus is much more shallow and sensitive to forced attachment loss.

13

What is "attachment loss?"

apical movement of the junctional epithelium down the root surface, away from the CEJ; it is not a physical loss of epithelium but rather a loss of position

14

True or False: Viable functional epithelium is necessary for pocket formation.

True

15

What happens in Necrotizing Ulcerative Periodontitis (NUP)?

Junctional epithelial cells DIE and bone is exposed; there is NO POCKETING

16

Clinical attachment loss is equal to ______ + ________.

Pocket depth + gingival recession

17

Is gingival recession recorded as a positive or negative number?

Positive

18

If a patient has a pocket depth of 10mm, but the bottom of the pocket is only 7mm below the CEJ: how much recession do they have?

+3mm

19

If a patient has a pocket depth of 6mm, but the free gingival margin is 3mm coronal to the CEJ: how much attachment loss do they have? Is this normal/what is happening?

Clinical Attachment Loss (CAL) = recession +pocket depth
-3mm + 6mm = 3 mm AL
This is pseudopocketing

20

If a patient has 3mm of recession and a 6mm pocket depth, what is their CAL?

9mm (pocket depth + recession)

21

Gingival Connective Tissue (lamina propria) matrix and fibers are synthesized by _______.

Fibroblasts

22

Which cells of the lamina propria are vasoactive?

Mast Cells

23

Which cells of the lamina propria are synthesizing and phagocytic?

Macrophages

24

In addition to fibroblasts, mast cells, and macrophages; which cells types are present in the lamina propria (gingival connective tissue)?

Neutrophilic Granulocytes
Lymphocytes
Plasma Cells

25

Which four fiber types are prevalent in the lamina propria (gingival CT)?

1. collagen
2. reticulin
3. ocytalan
4. elastic
***C.O.R.E of the gingiva***

26

Which fiber type is most abundant in the gingival connective tissue (lamina propria)?

Collagen

27

What is characteristic of collagen in the lamina propria?

Cross-banding

28

Collagen is produced by _______, ________, and ______.

Fibroblasts
Osteoblasts
Cementoblasts

29

Which two fiber types of the lamina propria are found around blood vessels?

Reticulin and elastic fibers

30

Which fiber type of the lamina propria is found mostly in the PDL?

Oxytalan

31

What three critical roles do gingival fibers play in the periodontium?

1. reinforce the gingiva
2. provide resilience and tone
3. maintain architectural form and integrity

32

Name four important gingival fiber types.

1. Circular
2. Dentogingival
3. Dentoperiosteal
4. Transseptal

33

Which gingival fiber type encircles the tooth like a cuff?

Circular

34

Which gingival fiber type fans out from supracrestal cementum into free gingiva?

Dentogingival

35

Which gingival fiber type runs from supracrestal cementum into attached gingiva?

Dentoperiosteal

36

Which gingival fiber type runs from tooth to tooth (embedded in cementum)?

Transseptal

37

What is the difference between dentoperiosteal and dentogingival?

both run from supracrestal cementum:
gingival-->free gingiva (more coronally fanned out)
periosteal-->attached gingiva (more apical)

38

Definition: Richly vascular and cellular connective tissue surrounding the roots and joining cementum and alveolar bone.

Periodontal Ligament (PDL)

39

Radiographically, the PDL is the space between the ________ (alveolar bone proper) and the root surface.

lamina dura

40

How wide is the PDL?

~0.25mm

41

What is the functional importance of the periodontal ligament?

permits forces to be distributed and is essential for tooth mobility

42

Name the four fibers of the PDL.

1. Alveolar Crest Fibers (ACF)
2. Horizontal Fibers (HF)
3. Oblique Fibers (OF)
4. Apical Fibers (APF)

think "aLoha" (L for ligament)

43

True or False: There is no structural or compositional difference between differently named fibers of the PDL.

True

44

Cells of the PDL include _________, osteoblasts, osteoclasts, cementoblasts, epithelial cells, nerve fibers, and ________.

Fibroblasts
Epithelial Rest Cells of Mallassez

45

What are Epithelial Rest Cells of Mallassez?

Remnants of Hertwig's epithelial root sheath

46

What is the mineralized tissue that covers the root surface and portions of the tooth crown?

Cementum

47

Cementum is similar to bone but differs in which four critical ways?

1. No blood vessels
2. No lymph vessels
3. No innervation
4. No physiologic resorption/remodeling

48

What is the mineral content of cementum?

65%

49

True or False: Cementum is continually deposited throughout life.

True

50

Cementum ______ fibers are embedded in ______ matrix.

Collagen
Organic

51

INTRINSIC cemental fibers are produced by _______ and are oriented _______ to the root.

Cementoblasts
Parallel
**IntrInsIc....the "I"s are all parallel**

52

EXTRINSIC cemental fibers are called ________ and are produced by _________.

Sharpey's Fibers
PDL fibroblasts

53

What are the three forms of Cemental fibers?

Acellular, extrinsic
Cellular, mixed stratified
Cellular, intrinsic

54

Which cemental fiber type is found in the coronal or middle portion of the root?

Acellular, extrinsic fibers

55

Which cemental fiber type is found in the apical third of the root and in furcations?

Cellular, mixed stratified

56

Which cemental fiber type is found in resorption lacunae?

Cellular, intrinsic

57

Is cementum thickness greater in the cervical or apical portion of the root?

Apical (150-250 micrometers)
Cervical (20-50 micrometers)

**Think about it: what is internal to the cementum? PULP, which takes up less of the thickness as it moves apically**

58

Alveolar bone consists of bone that is formed by cell from which two locations?

cells from the dental follicle
cells independent of tooth development

59

Alveolar bone is made up of ______ bone and ______ bone.

Cancellous
Cortical

60

Bone marrow is made up of adipocytes, vascular structures, and undifferentiatied _______ cells.

mesenchymal

61

True or False: Osteoid (alveolar bone matrix) undergoes mineralization by the deposition of calcium and potassium.

False: calcium and PHOSPHATE

62

Alveolar bone matrix is produced by _____ .

Osteoblasts

63

Bone matrix (osteoid) consists of _______fibers, proteoglycans, and _________.

Collagen fibers
glycoproteins

64

Which dental tissue most closely resembles bone?

cementum

65

Blood supply to the gingiva is provided by ________ vessels.

Supraperiosteal (terminal branches of multiple vessels of the face)

66

Blood supply to the periodontal tissues is provided by the dental artery, __________, ________, intra-septal artery, and rami perforantes.

Superior Alveolar a.
Inferior Alveolar a.

67

Lymphatic drainage of the periodontium is through the _____, deep cervical, _______, and jugulodigastric lymph nodes.

Submental
Submandibular

68

The periodontium is innervated by end branches of the _____ nerve.

Trigeminal