Activity 5+6: Identifying Types of teeth and Accessory Digestive Organs + Studying the Microscopic Anatomy of the Tooth

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1

By the age of 21, how many sets of teeth have developed?

2

2

The initial set of teeth are called what?

Deciduous aka milk teeth

3

The deciduous or milk teeth normally appears between what ages?

6 months and 2.5 years

4

The first of the deciduous or milk teeth to appear are which ones?

The lower central incisors

5

A child begins to shed the deciduous teeth around what age?

6 years old

6

After the deciduous teeth are shed around age 6, what set of teeth gradually replaces them?

The permanent teeth

7

What happens to the roots of the deciduous teeth as the deeper permanent teeth progressively enlarge and develop?

The roots of the deciduous teeth are resorbed, leading to their final shedding

8

All your teeth are classified by what 4 categories?

1. Incisors

2. Canines

3. Premolars

4. Molars

9

Canines are also called by what 2 names?

1. Eyeteeth

2. Cuspids

10

Premolars are also called by what name?

Bicuspids

11

Teeth names reflect differences in what 2 areas?

1. Structure

2. Function

12

The incisors exert what type of action and are used in what action?

Exert a shearing action used in biting

13

What action are canines used for?

Tearing of food

14

The premolars have how many cusps?

2

15

What are cusps and what are they used for?

Cusps are grinding surfaces and are used for grinding food

16

Describe the structures of crowns and cusps in the molars?

Broad crowns and rounded cusps

17

The molars are specialized for what function?

The fine grinding of food

18

Dentition is described by means of what formula?

The dental formula

19

The dental formula designates what 3 criteria in how many sides of the jaw?

Designates the...

1. Numbers

2. Types

3. Position

...of the teeth in one side of the jaw.

20

Why is it necessary to designate only one side of the jaw?

Because tooth arrangement is bilaterally symmetrical

21

What is the complete dental formula for the deciduous teeth from the medial aspect of each jaw and proceeding posteriorly?

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22

What is the abbreviated dental formula for the deciduous teeth?

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23

What is the abbreviated dental formula for the permanent teeth?

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24

How many deciduous teeth are there?

20

25

How many permanent teeth are there?

32

26

Yes/No? Although 32 is designated as the normal number of permanent teeth, does everyone develop a full set of permanent teeth?

No

27

1. In many people, what specific set of teeth never erupt?

2. The aforementioned set of teeth is also commonly called what?

1. The third molars

2. Wisdom teeth

28

A tooth consists of what 2 major regions?

1. Crown

2. Root

29

The crown and root, two major regions of a tooth, meet at which specific location?

The neck

30

The neck is located near which line?

Near the gum line

31

The crown is what portion of the tooth?

The superior portion of the tooth

32

The crown is also located above which specific part of the tooth?

The gingiva

33

The gingiva is also commonly called what?

gum

34

The surface of the crown is covered by what?

Enamel

35

What is the hardest substance in the body?

Enamel

36

Is enamel fairly brittle?

Yes

37

Enamel consists mainly (95-97%) of what?

Calcium phosphate (CaPO4) or calcium salts

38

What is the crevice between the end of the crown and the upper margin of the gingiva? (Hint: a type of sulcus)

The gingival sulcus

39

What is the portion of the tooth that is embedded in the bone?

The root

40

The outermost surface of the root is covered by what?

Cement

41

Cement is similar to what in composition?

Bone

42

Is cement less brittle than enamel?

Yes

43

The cement attaches the tooth to what ligament?

Periodontal ligament

44

What are the 2 functions of the periodontal ligament?

1. Holds the tooth in the tooth socket

2. Cushions the tooth

45

What makes up the bulk of the tooth?

Dentin

46

Dentin is similar in structure to what?

Bone

47

Dentin is located interiorly to what 2 "layers" of the tooth?

Interiorly to the enamel and cement

48

What cavity occupies the central portion of the tooth?

The pulp cavity

49

Pulp is made up of what tissue?

Connective tissue

50

Pulp is supplied with what 4 structures? (Hint: 3 are vessels)

1. Arteries

2. Veins

3. Lymphatic vessels

4. Nerves

51

What are the 2 functions of the pulp?

1. Provides for tooth sensation

2. Supplies nutrients to the tooth tissues

52

Where are odontoblasts located, and what is there function?

Located in the outer margins of the pulp cavity and produces dentin

53

When the pulp cavity extends into distal portions of the root, what does it now become? (Hint: a type of canal)

Root canal

54

What is the apical foramen?

An opening at the root apex

55

What is the function of the apical foramen? (Hint: entry for 2 things)

Provides a route of entry into the tooth for blood vessels and nerves from the tissues beneath

56
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63

The deciduous teeth are missing what 3 sets of teeth when compared to the permanent teeth?

1. First premolar

2. Second premolar

3. Third molar

64
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