Development of the Primary and Permanent Dentition (Part I)

Question 1

How many teeth are present in the deciduous dentition?

Answer 1

20

Question 2

The permanent molars erupt ___ to the primary dentition. This results in ____.

Answer 2

distally; mixed dentition

Question 3

The eruption of permanent teeth occurs from ages:

Answer 3

6-13 years old

Question 4

How many teeth are present in the permanent dentition?

Answer 4

32

Question 5

Symmetric crown shapes are seen in:

Answer 5

primary dentition

Question 6

In the primary dentition, larger spaces called ____ are found mesial to upper cuspids and distal to lower cuspids

Answer 6

“primate” spaces

Question 7

Where are the primate spaces in the lower primary dentition?

Answer 7

distal to lower cuspids

Question 8

Where are the primate spaces in the upper primary dentition?

Answer 8

mesial to upper cuspids

Question 9

What can be seen in the following image?

Answer 9

primate spaces

Question 10

Rule #1 states that if there is NO interdental spacing in the deciduous dentition:

Answer 10

Crowding of the permanent dentition will most probably occur

Question 11

What is the probability that crowding will occur in the permanent dentition if there is NO interdental spacing in the deciduous dentition?

Answer 11

75%

Question 12

What can be seen in this image?

Answer 12

ectopic eruption of mandibular central incisors

Question 13

A feature that is important to get space for permanent incisor eruption:

Answer 13

diastemas between anterior primary teeth

Question 14

The upper incisors erupts to the ____ of primary teeth.

The lower incisors tend to erupt to the ____ of primary teeth

Answer 14

labial; lingual

Question 15

T/F: There is no significant increase in arch size after the eruption of the permanent incisors

Answer 15

true

Question 16

Unlike the permanent dentition, in the primary dentition there is no ____ of the incisors

Answer 16

angulation

Question 17

What is seen in this image?

Answer 17

Primary teeth = no angulation

Question 18

Anterior primary teeth are ____ than permanent teeth

Answer 18

smaller

Question 19

T/F: Some primary posterior teeth are larger than their successor

Answer 19

True

Question 20

Give an example of a maxillary primary tooth that is larger than its successor

Answer 20

Upper second primary molar (8.2mm) is replaced with upper second premolar (7.0mm)

Question 21

Give an example of a mandibular primary tooth that is larger than its successor

Answer 21

Lower second primary molar (9.9mm) is replaced with lower second premolar (7.0mm)

Question 22

An imaginary surface that passes through the occlusion of the teeth:

Answer 22

occlusal plane (OP)

Question 23

The occlusal plane is usually a ____ surface, strictly speaking, not a plane but commonly is approximated by one.

Answer 23

curved

Question 24

What is the occlusal plane based on?

Answer 24

specific reference points within the dental arches

Question 25

The maxillary occlusal plane passes through the _____ of the posterior teeth and the ___ of the maxillary incisors

Answer 25

occlusal cusps; incisal edges

Question 26

The maxillary occlusal plane passes through the occlusal cusps of the ___ and the incisal edges of the ____

Answer 26

posterior teeth; maxillary incisors

Question 27

The mandibular occlusal plane is tangent to the ____ of the posterior teeth and the ____ of the mandibular incisors

Answer 27

occlusal cusps; incisal edges

Question 28

The mandibular occlusal plane is tangent to the occlusal cusps of _____ and the incisal edges of the ____

Answer 28

posterior teeth; mandibular incisors

Question 29

Primary teeth are positioned ___ degrees to the occlusal plane (permanent teeth are not)

Answer 29

90 degrees

Question 30

The curve displayed in the sagittal plane (or rather, in a plane parallel with the body of the mandible on either side) by the cusps and incisal edges of the mandibular teeth.

Answer 30

curve of spee

Question 31

The convex aspect of the curve of spee is pointing:

Answer 31

inferiorly

Question 32

The ____ aspect of the curve of spee is pointing inferiorly

Answer 32

convex

Question 33

The concept of the curve of spee was first introduced by:

Answer 33

F. Graf von Spee (1890)

Question 34

What did F. Graf von Spee theorize?

Answer 34

That the extension of this curve would be tangent to the anterior surface of the mandibular condyles (bilaterally)

Question 35

What can be seen in the following image?

Answer 35

Curve of spee (permanent dentition)

Question 36

In the primary dentition, the curve of spee is:

Answer 36

flat

Question 37

What can be seen in the following image?

Answer 37

flat curve of spee in primary dentition

Question 38

If a malocclusion is diagnosed in the primary dentition, it will probably:

Answer 38

worsen during growth

Question 39

List the occlusal relations of the deciduous dentition: (3)

Answer 39

1. upper and lower incisors are vertical 2. minimal overbite and overjet 3. upper canine tip is positioned in the embrasure between the lower canine and the first primary molar

Question 40

Occlusal relations of deciduous dentition: Upper and lower incisors are:

Answer 40

vertical

Question 41

Occlusal relations of deciduous dentition: _____ overbite and overjet

Answer 41

minimal

Question 42

Occlusal relations of deciduous dentition: Upper canine tip is positioned in the embrasure between the:

Answer 42

lower canine and the first primary molar

Question 43

What can be seen in this image?

Answer 43

overbite

Question 44

The distance between the labial surface of the mandibular incisors and the labial aspect of the incisal edge of the maxillary incisors, usually measured parallel to the occlusal plane:

Answer 44

overjet

Question 45

Overjet is the distance between ___ surface of the mandibular incisors and the ___ aspect of the incisal edge of the maxillary incisors

Answer 45

labial surface; labial

Question 46

When not otherwise specified, this term is generally assumed to refer to the most prominent central incisors:

Answer 46

overjet

Question 47

Overjet, when not otherwise specified is generally assumed to refer to the:

Answer 47

most prominent central incisors

Question 48

The extent of overjet is determined primarily by the differences of:

Answer 48

labiolingual position and inclination of the maxillary and mandibular central incisors

Question 49

Only in a minority of cases is the ____ skeletal relationship reflected directly in the amount of overjet

Answer 49

anteroposterior

Question 50

The primary dentition consists of 20 teeth including:

Answer 50

1. incisors 2. canines 3. primary molars

Question 51

First tooth is the ____ and appears around the age of ___.

Answer 51

lower incisor; 8 months

Question 52

By _____ all primary teeth should be present

Answer 52

30 months