Gingival Histology (Killeen)

Question 1

Gingival Epithelial cell types

Answer 1

Keratinocytes
Langerhans cells
Merkel cells
Melanocytes

Question 2

Keratinocytes

Answer 2

Principal cell type in gingiva

Synthesize keratin

Question 3

Proliferation of Keratinocytes

Answer 3

Mitosis in basal layer
Some remain to proliferate
Larger cells migrate to surface

Question 4

Melanocytes

Answer 4

Synthesize melanin

Differentiate to dendritic cells: located in basal and spinous layers

Question 5

Langerhans Cells

Answer 5

Important in the Immune response

Act as APCs for lymphocytes

Question 6

Merkel Cells

Answer 6

Located in deeper layers of epithelium
Harbor nerve endings: tactile receptors
Connected to adjacent cells by desmosomes

Question 7

All epithelial cells are

Answer 7

Metabolically active

Protection in function

Question 8

Oral epithelium has pominent ____

Answer 8

Rete pegs

Question 9

Order of Keratinization

Answer 9

Hard palate
Gingiva
Ventral tongue
Buccal mucosa

Question 10

Sulcular Epithelium

Answer 10

Nonkeratinized
Lines gingival sulcus
Has potential to become keratinized
Stratified squamous

Question 11

Sulcular epithelium lacks ____, and ____

Answer 11

Rete pegs

Merkel cells

Question 12

Junctional Epithelium

Answer 12

Nonkeratinzed
Attached to tooth via basal lamina
No rete pegs
Stratified squamous
Protects against plaque and bacteria

Question 13

Internal basal lamina

Answer 13

Lamina densa + Lamina lucida

Question 14

Lamina densa

Answer 14

Adjacent to tooth

Reinforced by gingival fibers

Question 15

Lamina lucida

Answer 15

Attached by hemidesmosomes from JE

Dental cuticle may be between tooth basal lamina

Question 16

External basal lamina

Answer 16

Attaches JE to CT

Continuous with Sulcular epithelium

Question 17

Dental cuticle

Answer 17

Layer of protein which may or may not be present on enamel

Non-mineralized

Question 18

Dentogingival unit = ____

Answer 18

JE + Gingival fibers

Question 19

JE attaches to ____

CT attaches on ____

Answer 19

Enamel

Cementum

Question 20

Biologic width

Answer 20

Combination of JE and CT attachment

Must not be invaded by restoration, crown margins, etc.

Question 21

GCF

Answer 21

Cleansing material
Contains plasma proteins
Antimicrobial properties
Supports antibody activity

Question 22

Dentogingival fibers are located:

Answer 22

Facial surfaces
Lingual surfaces
Interproximal surfaces

Question 23

Circular fibers are located:

Answer 23

Within CT of marginal and interdental gingiva

Question 24

Transseptal fibers are located:

Answer 24

Interproximally from cementum to cementum

Question 25

Dentoperiosteal fibers are located:

Answer 25

From Dentin to Bone

Question 26

Passive eruption is defined as the ____

Answer 26

Apical migration of JE (ex: Periodontal disease)