Histology Quiz

Question 1

What do we call alternating light and dark bands in the enamel which gives the tooth surface a wavelike appearance?

Answer 1

Hunter-Schreger Band (HSB).

Question 2

At what stage of tooth development are enamel pearls formed?

Answer 2

Apposition Stage.

Question 3

What is displaced to cause enamel pearls?

Answer 3

Ameloblasts.

Question 4

What are enamel pearls often confused with?

Answer 4

Calculus.

Question 5

Describe carious lesions in the enamel as they first appear…

Answer 5

“White-spot lesion”

-Appear whiter and rougher due to demineralization.

Question 6

Give two examples of enamel hypoplasia…

Answer 6

EITHER…
Enamel pearl, and enamel dysplasia
OR…
hereditary enamel hypoplasia, and environmental enamel hypoplasia.

Question 7

What is fluorosis?

Answer 7

Excess systemic fluoride during tooth development.
-Intrinsic stain.
~Can not be removed.

Question 8

List four causes of dentin/tooth hypersensitivity.

Answer 8

1. Caries
2. Cavity preparation
3. Gingival recession
4. Attrition

Question 9

How do we detect dentin exposure?

Answer 9

…

Question 10

Which developmental defect can result in a brittle bluish tinge to the teeth?

Answer 10

Dentinogenesis imperfecta.

Question 11

Describe dentin…

Answer 11

The hard inner layer of tooth crown overlying the pulp.

Question 12

What area of the pulp communicates with the rest of the body by allowing arteries, veins, and nerves to enter?

Answer 12

Apical foramen.

Question 13

Describe the difference between the pulp chambers and horns of the primary dentition compared to the adult dentition…

Answer 13

• Pulp horns recede with age.

- Radicular pulp narrows with age.

Question 14

On a radiograph, what appears more radiolucent? Dentin or pulp…

Answer 14

Pulp.

Question 15

What occurs to the number of nerves and blood vessels in the pulp as we age?

Answer 15

• They reduce.
• A decrease in intracellular substance, water, and cells as it fills with an increased amount of collagen fibers.
• The pulp becomes more fibrotic with age.

Question 16

List 3 factors that may increase cemental caries in older adults…

Answer 16

1. Xerostomia
2. Poor manual dexterity
3. Poor nutrition

Question 17

The most common interface at the CEJ is when the cementum and enamel meet end to end. This occurs in _____% of cases.

Answer 17

52%

Question 18

What is hypercementosis?

Answer 18

Excessive production of cellular cementum.

Question 19

Where is hypercementosis most commonly found?

Answer 19

Apex or apices of the tooth.

Question 20

What is the function of the periodontal ligament?

Answer 20

• Supportive function.
• Attaches the tooth to the alveolar bone.
• It allows very minimal movement.

Question 21

What occurs to the periodontal ligament with age?

Answer 21

…

Question 22

List the 5 fibers of the periodontal ligament.

Answer 22

1. Alveolar crest fibres.
2. Horizontal fibers.
3. Oblique fibers.
4. Apical fibers.
5. Interradicular fibers.

Question 23

What is periodontitis?

Answer 23

Periodontal disease involving deeper structures of the periodontium.

Question 24

What will periodontitis result in?

Answer 24

• Loose teeth (mobility).
• Tooth loss.
• Loss of attachment.
• Bone loss.
• Gingival recession.

Question 25

Name the three salivary glands and their associated ducts…

Answer 25

1. Parotid = Stenson’s duct.
2. Submandibular = Wharton’s duct.
3. Sublingual = Bartholin’s duct.

Question 26

What is the largest salivary gland?

Answer 26

Parotid.

Question 27

What is the smallest salivary gland?

Answer 27

Sublingual.

Question 28

Sjogren’s syndrome results in ________.

Answer 28

Dry eyes, and dry mouth (xerostomia).

Question 29

What makes up saliva?

Answer 29

Minerals, 
Electrolytes, 
Proteins, 
Buffers, 
Enzymes, 
Immunoglobulins, 
Metabolic wastes, and 
Water.