Histological Features of Normal Oral Tissues

Question 1

Oral mucosa covers the entire surface of the oral cavity with the exception of the gingiva, which is a specialized form of _________

Answer 1

Mucoperiosteum

Question 2

The mucosa is made up of what two layers?

Answer 2

Surface epithelium
Lamina propria

Question 3

The mucosa is made up of surface epithelium and the lamina propria. What are the 4 layers of the non-keratinized mucosal epithelium (buccal and sublingual)?

Answer 3

1. Basal cell layer
2. Prickle cell layer
3. Intermediate Cell layer
4. Superficial layer

Question 4

The mucosa is made up of surface epithelium and the lamina propria. What are the 4 layers of the keratinized mucosal epithelium (palate and dorsal tongue)?

Answer 4

1. Basal cell layer
2. Prickle cell layer
3. granule cell layer
4. Keratinized (or parakeratinzed) layer

Question 5

The mucosa is made up of surface epithelium and the lamina propria. What are the 2 layers of the lamina propria?

Answer 5

1. Papillary (interdigitates with the epithelium)
2. Reticular (contains vasculature)

Question 6

The gingiva is a mucoperiosteal tissue that is made up of what 2 layers?

Answer 6

1. Surface epithelium
2. Fibrous stroma
   No distinct lamina propria or submucosa

Question 7

The free gingiva is comprised of tissue from what 2 embryological sources?

Answer 7

1. Gingiva - outer surface
2. Ondontogenic origin (Reduced enamel epithelium and dental follicle)

Question 8

The periodontal ligament (gomphosis) has 3 functions:

Answer 8

1. holding tooth in place
2. sensory receptor
3. cushion for tooth when subjected to forces

Question 9

What are the 5 types of Mesenchymal cells present in the PDL?

Answer 9

1. Fibroblasts
2. Osteoblasts
3. Osteoclasts
4. Cementoblasts
5. Undifferentiated mesenchymal cells

Question 10

The end of a collagen fiber bundle where is embeds into cementum or bone is called ______

Answer 10

Sharpey’s Fibers

Question 11

The Principle fibers within the PDL are composed of ______ and attach tooth to bone by anchoring into the cementum to the alveolar bone.

Answer 11

Type 1 Collagen

Question 12

What cells secrete enamel matrix that provides scaffold for mineralization?

Answer 12

Ameloblasts

Question 13

What are the 3 main types of dentin?

Answer 13

1. PRimary
2. Secondary
3. Tertiary

Question 14

The first layer of odontogenic matrix to be deposited and is the initial mineralization center at the interface of enamel and dentin is called____________

Answer 14

Mantle dentin

Deposited at the outset of dentinogenesis crown formation

Question 15

Which of the following is FALSE regarding Tertiary dentin
a. produced by damaged odontoblasts or replacement odontoblasts from the pulp
b. also called Osteodentin because the matrix is amorphous and bone-like
c. formed when odontoblasts are disrupted or injured
d. has highly organized tubular artchitecture

Answer 15

D.
Tertiary dentin matrix is deposited irregularly

Question 16

True or false: Primary and secondary dentin are histologically identical

Answer 16

True

Question 17

When does primary dentin form?

Answer 17

primary dentin is deposited until root formation is complete

Question 18

What cell makes dentin?

Answer 18

Osteoblast

Question 19

True or False: The jawbones form by endochondral ossification

Answer 19

False: Formed by intramembranous ossification

Question 20

The maxillary bone is continuous with adjacent plates of bone that form from different ossification centers. These plates interconnect through bone-bone junctions referred to as ____________

Answer 20

Synostoses