Gingival and DGJ Tissue

Question 1

Gingival tissue

Answer 1

parakeratinized stratified squamous epithelium

Question 2

Attached gingiva serves as the…

Answer 2

mucoperiosteum

Question 3

Marginal gingiva is what type of mucosa?

Answer 3

masticatory; orthokeratinized stratified squamous epithelium

Question 4

Is the col keratinized?

Answer 4

NO

Question 5

Dentogingival junction tissue

Answer 5

junction between tooth surfaces and gingival tissue, formed by sulcular epithelium and junctional

Question 6

Gingival crevicular fluid

Answer 6

flow is slight in health (1-2 micrometers), contains immunological components and WBC, increases in response to inflammation

Question 7

Sulcular epithelium

Answer 7

nonkeratinized, smooth interface at JE, increased permeability allows for migration of WBC

Question 8

Junctional epithelium

Answer 8

nonkeratinized, smooth interface, loosely packed with fewer desmosomes, thinner than sulcular

Question 9

Superficial and supra basal cells of JE

Answer 9

provide hemidesmosomes and internal basal lamina to create the EA

Question 10

is the internal basal lamina continuous with external basal lamina?

Answer 10

Yes; EA strong and healthy, acts as type of seal

Question 11

Basal layer

Answer 11

deepest layer, undergoes constant mitosis

Question 12

Which layers are absent?

Answer 12

Keratin and granular, open to microorganisms due to lack of barrier

Question 13

Describe development of the DGJ

Answer 13

1. ameleoblasts secret basal lamina on tooth surface, serves as part of EA
2. coronal part of fused REE and surrounding epithelium becomes firmly attached to tooth
3. as root forms, tissue replaced by definitive JE

Question 14

How is the junctional epithelium formed?

Answer 14

cells found in the REE by mitosis, except for ameleoblasts since these are lost
*JE does not undergo maturation

Question 15

What is the turnover time for DGJ tissue?

Answer 15

4-6 days
highest turnover rate in entire oral cavity