Surface Coatings of Teeth

Question 1

What makes up the reduced enamel epithelium?

Answer 1

reduced ameloblasts and stratum intermedium

Question 2

What is the primary enamel cuticle?

Answer 2

basal lamina of reduced enamel epithelium

Question 3

What is Nasmyth’s membrane?

Answer 3

reduced enamel epithelium and primary enamel cuticle

Question 4

what type of epithelium is the junctional epithelium?

Answer 4

stratified non keratinised

Question 5

what are the adjacent structures/cells of the internal basal lamina?

Answer 5

enamel and junctional epithelium

Question 6

what is found on either side of the external basal lamina?

Answer 6

connective tissue and junctional epithelium

Question 7

how is junctional epithelium attached to enamel?

Answer 7

hemidesmosomes associated via a6B4 intergrins on junctional epithelium that interact with laminin 5 in internal basal lamina

Question 8

how many cells thick is junctional epithelium at base of sulcus?

Answer 8

15-30

Question 9

What is bullous pemphigoid?

Answer 9

autoimmune reaction against components of hemidesmosomes. Seperation of dermis and epidermis

Question 10

what are the 3 main roles of the junctional epithelium?

Answer 10

1. physical barrier
2. GCF flow
3. Formation of enamel pellicle

Question 11

Where does GCF travel from and to?

Answer 11

from connective tissue through external basal lamina in to junctional epithelium

Question 12

What is the funtion of the wide intercellular spaces between junctional epithelial cells?

Answer 12

nerves, neutrophils (spaces widen with inflam) and passage of GCF

Question 13

How thick is the acquired enamel pellicle?

Answer 13

0.1 to 1 micrometer

Question 14

what is the function of acquired enamel pellicle?

Answer 14

lubrication in mastication and preventing oral tissues drying out