Exam 1; Anatomy of the Periodontium Flashcards Preview

AU14 Periodontology > Exam 1; Anatomy of the Periodontium > Flashcards

Flashcards in Exam 1; Anatomy of the Periodontium Deck (50):
1

What are the four things that compose the periodontium

gingiva
periodontal ligament
root cementum
alveolar bone

2

What are the two endings of the PDL called

bundle bone when attached directly to bone
Sharpay's fibers when attached to cementum

3

What are the two functions of the periodontium

attach the tooth to bony tissue of the jaw
maintain integrity of the masticatory mucosa

4

The cells that develop into the periodontium originate from where

neural crest (neural tube)

5

The stoma deal epithelium releases factors which initiate what

epithelial-ectomesenchymal interactions

6

What two structures does the dental papilla give rise to

the dentin and pulp

7

What structure does the dental follicle give rise to

the periodontium

8

This structure determines the shape and form of the tooth

dental papilla

9

Why do you not bleed upon eruption of the teeth?

because the tooth follows an epithelium lined canal with no vessels

10

This gives rise to the junctional epithelium

reduced enamel epithelium

11

The inner cells of the root sheath secrete what

enamel-related proteins; amelogenins

12

What is the role of amelogenins

it induces differentiation of ectomesenchymal cells of the folic contacting root surface to differentiate into cementoblasts

13

This is formed by fibroblasts that are differentiated from the dental follicle lateral to the cementum

periodontal ligament

14

These differentiate from dental follicle ectomesenchymal cells

osteoblasts (alveolar bone proper)

15

True or False
Ectomesenchymal cells do not remain in the mature periodontium

False; they do and participate in turnover (cementoblasts, osteoblasts, fibroblasts)

16

This is the part of the masticatory mucosa which covers the alveolar process and surrounds the cervical portion of the teeth

gingiva

17

What are the three parts of the gingiva

free gingiva
attached gingiva
interdental papilla

18

This extends from the free gingival margin to the free gingival groove

free gingiva

19

What type of epithelium is the free gingiva composed of

keratinized epithelium

20

This is the coronal end of the gingiva; located 1.5-2mm coronal to the CEJ

free gingival margin

21

This is the junction between the free and attached gingiva corresponding to the CEJ; only found in 30-40% of adults

free gingival groove

22

This gingival epithelium faces the oral cavity

oral epithelium

23

This gingival epithelium faces the tooth surface without contacting it

oral sulcular epithelium

24

This provides contact between the gingiva and the tooth

junctional epithelium

25

This is the source of the oral sulcular epithelium

oral epithelium

26

What is the microscopic limits of the free (marginal) gingiva

extending from the FGM to the JE

27

What is the macroscopic limits of the free (marginal) gingiva)

extending from the FGM to the FGG

28

Having a firm texture, coral pink in color, and immobile are all properties of what

attached gingiva

29

What can cause the width to vary regarding the attached gingiva, and where is it the widest/narrowest

increases with age
widest in incisors; narrowest in premolars
mandibular lingual; narrowest in incisors, widest in molars

30

These are small depressions on the attached gingiva; present in only 40% of adults

stippling

31

This is the junction between the attached gingiva and the alveolar mucosa

muccogingival junction

32

True or False
The muccogingival junction extends to the palate

False; there is no muccogingival junction on the palate

33

Why is there no muccogingival junction on the palate

because there is no alveolar bone; all keratinized tissue

34

What is the keratinized gingiva composed of

The attached and marginal gingiva

35

The marginal gingiva is also known as what

the sulcus

36

If you are measuring 7mm of keratinized gingiva - 4mm sulcus, how much attached gingiva is there`

3mm
7mm keratinized (attached + marginal) - 4mm sulcus (marginal) = 3mm attached

37

What three things does the shape of the interdental papilla depend upon

the contact relationships between adjacent teeth
width of approximate tooth surfaces
course of CEJ

38

This is the interdental papilla concavity seen in the contact regions of the premolar/molar; made of non-keratinized epithelium

col

39

True or False
the col is prone to periodontal disease

True

40

What becomes of the col upon tooth extraction

it will flatten and keratinize

41

What are the four layers of the oral epithelium

basal layer (stratum basale)
prickle cell layer (stratum spinosum)
granular cell layer (stratum granulosum)
keratinized cell layer (stratum corneum)

42

What two things occur from the basal layer to the granular layer

cytoplasmic tonofilaments and number of desmosomes increase
number of organelles increase

43

What are the two cell types of the oral epithelium

keratinocytes (90%)
clear cells

44

What three cells make up clear cells

melanocytes
Langerhans cells
Merkel's cells

45

This is present between the basal layer of oral epithelium and the CT; 1-2µm wide

basement membrane

46

What molecules is the basement membrane rich in

glycoproteins
contains protein-polysaccharide complexes

47

This layer of the basement membrane is adjacent to basal cells

lamina lucida

48

This layer of the basement membrane is adjacent to connective tissue

lamina densa

49

These are dense plaques that attach the epithelium to the basement membrane

hemidesmosomes

50

What causes stippling

fusion of the rete pegs where the connective tissue suppose is lost in thick gingiva (the rete peg is the epithelial projection)