Primary Dentition

Question 1

How many primary teeth are there?

Answer 1

20

Question 2

What is the dental formula for primary dentition?

Answer 2

2-1-2

Question 3

What is the dental formula for permanent dentition?

Answer 3

2-1-2-3

Question 4

What are the three annotation systems used?

Answer 4

Universal (A-T)
Palmer (A-E and Quad)
FDI International (Quad 5-8 and tooth # 1-8)

Question 5

What annotation system is used by americans?

Answer 5

Universal

Question 6

What annotation does most other countries use?

Answer 6

FDI International

Question 7

What is the eruption timeline for primary teeth?

Answer 7

Central Incisor 6-8 months
Lateral Incisor 7-9 months
First Molar 12-14 months
Canine 16-18 months
Second Molar 20-24 months

Question 8

What is the exfoliation timeline for primary teeth?

Answer 8

Central 6-7;7-8
Lateral 7-8;8-9
Canine 9-10;10-11
1st Molar 10-11;10-12
2nd Molar 11-12; 10-12

Question 9

True or false; mamelons are present on primary teeth.

Answer 9

False

Question 10

What color are primary teeth?

Answer 10

Whiter due to thinner enamel

Question 11

From the incisal cervical dimension how would you describe the size of primary teeth?

Answer 11

Short

Question 12

How would you describe the roots of primary teeth?

Answer 12

Longer, narrower and flare and the root trunk is nearly absent.

Question 13

True or false; the occlusal/incisal anatomy are prominent.

Answer 13

False, less pronounced.

Question 14

How would you describe the occlusal table of primary teeth?

Answer 14

Smaller with more of a buccal-lingual convergence.

Question 15

True or false; the contacts of primary teeth are broad and flat.

Answer 15

True

Question 16

Which molar in primary teeth is bigger?

Answer 16

2nd molar

Question 17

In comparison to permanent dentition how would you describe the enamel, dentin, pulp and pulp horns of primary teeth?

Answer 17

Enamel & Dentin = thinner
Pulp = large
Pulp Horns = more accentuated (especially mesial to deciduous teeth)

Question 18

Which direction do primary teeth drift?

Answer 18

Toward the midline

Question 19

What are the functions of primary dentition?

Answer 19

1. Maintain space

2. Guide for permanent eruption

Question 20

What is the type trait of primary max. central incisors?

Answer 20

No mamelons; wider M-D

Question 21

What is the type trait of primary canines?

Answer 21

Contacts at the same level.

Question 22

What is the type trait of primary molars?

Answer 22

2nd looks like permanent 1st molar.

Question 23

How many roots are in the primary molar maxillary arch typically?

Answer 23

3

Question 24

How many cusps are typically found in the maxillary molars of primary teeth?

Answer 24

3 to 4

Question 25

What cusp bulges on maxillary molars of primary dentition?

Answer 25

MB

Question 26

How many roots are typically seen in molars of the mandibular arch?

Answer 26

2

Question 27

How many cusps are typically seen in molars of the mandibular arch?

Answer 27

4

Question 28

How would you describe the ML cusp of molars in the mandibular arch of primary dentition?

Answer 28

Very tall and pointed.

Question 29

What are the four functions of dental curvatures?

Answer 29

1. Stabilize the arch 2. Prevent Disease 3. Disperse occlusal forces 4. Protect soft tissues

Question 30

What type of relationship is exhibited by dental curvatures?

Answer 30

Symbiotic relationship

Question 31

What 3 issues are associated with improper curvatures?

Answer 31

1. Premature tooth loss 2. Periodontal problems 3. Occlusal discrepancies

Question 32

How are proximal contact areas of primary teeth defined?

Answer 32

Adjacent tooth surfaces that touch.

Question 33

What are two reasons contact areas can increase in primary dentition?

Answer 33

1. Attrition | 2. Toward posterior

Question 34

Where are the contact locations found in primary anterior teeth?

Answer 34

Incisally placed centered facial to lingual.

Question 35

Where are the contact locations found in primary posterior teeth?

Answer 35

Middle 1/3 buccal of center.

Question 36

Why are contacts important?

Answer 36

1. Prevent food impaction | 2. Stabilization of the arch "synergy of stabilization"

Question 37

What two major issues can occur due to improper contacts?

Answer 37

1. Gingivitis (most common) | 2. Alignment changes...can cause bone and muscular changes, destroy tooth structure, and support system.

Question 38

What are embrasures?

Answer 38

V-shaped spaces formed around proximal contact

Question 39

What are the shape and size of embrasure spaces of the buccal and lingual aspects?

Answer 39

``` Buccal = wide Lingual = narrower/longer ```

Question 40

What are the functions of embrasures?

Answer 40

1. Spillway for escape of food. 2. Reduces occlusal trauma 3. Self-cleansing 4. Protects gingiva