Exam 1; Junctional Epithelium

Question 1

Where does the junctional epithelium originate from during and after tooth eruption

Answer 1

during = reduced dental epithelium
after = the cells of the oral (sulcular) epithelium possess the ability to differentiate into the cells of the JE

Question 2

Where is the JE widest?

Answer 2

in the coronal portion (15-20 cell layers)

thin towards the CEJ (3-4 cells)

Question 3

Where is the JE located

Answer 3

at or just below the CEJ

Question 4

What is the relative size of the cells and interstitial space of the JE compared to the OE

Answer 4

relatively large

Question 5

What is the number of desmosomes of the JE compared to the OE

Answer 5

JE < OE

Question 6

True or False

JE has the potential to keratinize

Answer 6

True

Question 7

True or False

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

Answer 7

True

Question 8

Apical movement of junctional epithelium in health and disease changes how

Answer 8

loses attachment position, not attachment itself

Question 9

This occurs when the junctional epithelium migrates apically down root surface

Answer 9

periodontitis

Question 10

This is necessary for pocket formation

Answer 10

viable junctional epithelium

Question 11

Necrosis of JE is seen in what (the cells die)

Answer 11

necrotizing ulcerative periodontitis

Question 12

What are the 6 cells that compose the gingival lamina propria

Answer 12

fibroblasts
mast cells
macrophages
neutrophilic granulocytes
lymphocytes
plasma cells

Question 13

What are the four fibers of the lamina propria

Answer 13

collagen
reticulin
oxytalan
elastic

Question 14

This fiber has characteristic cross-bonding, the most abundant, and is produced by fibroblasts, cementoblasts, and osteoblast

Answer 14

collagen

Question 15

This fiber is numerous adjacent to basement membrane and around blood vessels

Answer 15

reticulin

Question 16

This fiber is mostly in the PDL and runs parallel to the long axis of the tooth

Answer 16

oxytalan

Question 17

This fiber is mostly around blood vessels

Answer 17

elastic

Question 18

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

Answer 18

gingival fibers

Question 19

What are the four gingival fibers

Answer 19

circular fibers
dentogingival
dentoperiosteal
transeptal

Question 20

This gingival fiber encircles the tooth like a cuff

Answer 20

circular fibers

Question 21

This gingival fiber fans out from supra-crestal cementum onto free gingiva

Answer 21

dentogingival fibers

Question 22

This gingival fiber runs from supracrestal cementum into attached gingiva

Answer 22

dentoperiosteal fibers

Question 23

This gingival fiber runs from tooth to tooth (embedded in cementum)

Answer 23

transeptal

Question 24

This is richly vascular and cellular CT surrounding the roots and joining cementum and alveolar bone

Answer 24

periodontal ligament

Question 25

How is the PDL depicted radiographically

Answer 25

the space between lamina dura and root surface

Question 26

What is width of the PDL

Answer 26

0.25mm

Question 27

What is the function of the PDL

Answer 27

permits forces to be distributed | essential for tooth mobility

Question 28

These cells of the PDL are aligned along the principal fibers

Answer 28

fibroblasts

Question 29

These cells of the PDL line the bone surface

Answer 29

osteoblasts

Question 30

These cells of the PDL line the cemental surface

Answer 30

cementoblasts

Question 31

These cells of the PDL are multinucleate and create a ruffled surface of bone epithelial cells

Answer 31

osteoclasts

Question 32

These are remnants of the Hertwig's epithelial root sheath

Answer 32

epithelial rests of Mallassez

Question 33

This is the mineralized tissue covering root surface and occasionally, small portions of the crown of the teeth

Answer 33

cementum

Question 34

What are the four differences between cementum and bone

Answer 34

no blood vessels no lymph vessles no innervation no physiologic resorption/remodeling

Question 35

What three things characterize cementum

Answer 35

continuing deposition throughout life collagen fibers embedded in organic matrix high mineral content (65%); mainly HA

Question 36

These cemental fibers are produced by cementoblasts; composed of fibers oriented parallel to root

Answer 36

intrinsic

Question 37

These cemental fibers are also known as Sharpey's fibers and are produced by PDL fibers

Answer 37

extrinsic

Question 38

These cemental fibers are located coronal or the middle portion of the root

Answer 38

acellular, extrinsic fiber cementum

Question 39

These cemental fibers are in the apical third of the root and in furcation

Answer 39

cellular, mixed stratified cementum

Question 40

These cemental fibers in resorption lacunae

Answer 40

cellular, intrinsic fiber cementum

Question 41

Cementum thickness increases when

Answer 41

gradually throughout life cervical portion = 20-30µm apical portion = 150-250µm

Question 42

Alveolar bone consists of bone formed by what sources

Answer 42

cells from the dental follicle | cells independently of tooth development

Question 43

In alveolar bone, the osteoblasts produce what

Answer 43

bone matrix (osteoid) consisting of collagen fibers, glycoproteins, and proteoglycans

Question 44

In alveolar bone, osteoid undergoes what

Answer 44

mineralization by the deposition of minerals (calcium and phosphate)

Question 45

What vessels supply the gingiva

Answer 45

supraperiosteal vessels

Question 46

What vessels supply the periodontal tisssues

Answer 46

dental artery superior/inferior alveolar intraseptal

Question 47

What are the four lymph nodes associated with the gingiva/PD tissues

Answer 47

submental deep cervical submandibular jugulodigastric

Question 48

What are some nerves of the periodontium

Answer 48

end branches of the trigeminal