Structure of the oral tissues 1/10/17 TEST #1

Question 1

What is the masticatory force of teeth?

Answer 1

500 - 700 newtons

110 - 160 lbf

Question 2

What percentage of enamel is hydroxyapatitie mineral?

Answer 2

96%

Question 3

Is Enamel brittle or non brittle?

Answer 3

Brittle

Question 4

How much surface area in the oral cavity do teeth occupy?

Answer 4

20%

Question 5

What forms enamel?

Answer 5

-Ameloblasts

Question 6

Is enamel vital or non-vital?

Answer 6

non-vital

Question 7

What forms Dentin?

Answer 7

Odontoblasts

Question 8

What percentage of dentin is mineral?

Answer 8

70%

Question 9

Is Dentin vital or non-vital?

Answer 9

-Vital

Question 10

Is dentin permeable or non-permeable?

Answer 10

-permeable

Question 11

What three tissues is the periodontium made of?

Answer 11

• Bone
• Cementum
• Periodontal ligament

Question 12

What percentage of cementum is mineral?

Answer 12

-50%

Question 13

Is cementum vital or non-vital?

Answer 13

-Vital

Question 14

T/F

In a healthy tooth the anatomic crown and clinical crown are equal.

Answer 14

False

The clinical crown will be smaller than the anatomic crown

Question 15

What is the anatomic crown?

Answer 15

-The entire portion of the tooth covered by enamel

Question 16

What are two major approaches to identify disease susceptibility genes?

Answer 16

• Linkage analysis

- Candidate Gene analysis

Question 17

What does Diphyodont mean?

Answer 17

-Two sets of teeth (Primary then Permanent)