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Orthodontics I > Development of the Primary and Permanent Dentition (Part I) > Flashcards

Development of the Primary and Permanent Dentition (Part I) Flashcards

1
Q

How many teeth are present in the deciduous dentition?

A

20

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2
Q

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

A

distally; mixed dentition

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3
Q

The eruption of permanent teeth occurs from ages:

A

6-13 years old

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4
Q

How many teeth are present in the permanent dentition?

A

32

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5
Q

Symmetric crown shapes are seen in:

A

primary dentition

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6
Q

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

A

“primate” spaces

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7
Q

Where are the primate spaces in the lower primary dentition?

A

distal to lower cuspids

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8
Q

Where are the primate spaces in the upper primary dentition?

A

mesial to upper cuspids

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9
Q

What can be seen in the following image?

A

primate spaces

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10
Q

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

A

Crowding of the permanent dentition will most probably occur

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11
Q

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

A

75%

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12
Q

What can be seen in this image?

A

ectopic eruption of mandibular central incisors

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13
Q

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

A

diastemas between anterior primary teeth

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14
Q

The upper incisors erupts to the ____ of primary teeth.

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

A

labial; lingual

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15
Q

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

A

true

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16
Q

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

A

angulation

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17
Q

What is seen in this image?

A

Primary teeth = no angulation

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18
Q

Anterior primary teeth are ____ than permanent teeth

A

smaller

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19
Q

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

A

True

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20
Q

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

A

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

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21
Q

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

A

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

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22
Q

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

A

occlusal plane (OP)

23
Q

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

A

curved

24
Q

What is the occlusal plane based on?

A

specific reference points within the dental arches

25
Q

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

A

occlusal cusps; incisal edges

26
Q

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

A

posterior teeth; maxillary incisors

27
Q

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

A

occlusal cusps; incisal edges

28
Q

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

A

posterior teeth; mandibular incisors

29
Q

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

A

90 degrees

30
Q

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.

A

curve of spee

31
Q

The convex aspect of the curve of spee is pointing:

A

inferiorly

32
Q

The ____ aspect of the curve of spee is pointing inferiorly

A

convex

33
Q

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

A

F. Graf von Spee (1890)

34
Q

What did F. Graf von Spee theorize?

A

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

35
Q

What can be seen in the following image?

A

Curve of spee (permanent dentition)

36
Q

In the primary dentition, the curve of spee is:

A

flat

37
Q

What can be seen in the following image?

A

flat curve of spee in primary dentition

38
Q

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

A

worsen during growth

39
Q

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

A
  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
40
Q

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

A

vertical

41
Q

Occlusal relations of deciduous dentition: _____ overbite and overjet

A

minimal

42
Q

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

A

lower canine and the first primary molar

43
Q

What can be seen in this image?

A

overbite

44
Q

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:

A

overjet

45
Q

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

A

labial surface; labial

46
Q

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

A

overjet

47
Q

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

A

most prominent central incisors

48
Q

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

A

labiolingual position and inclination of the maxillary and mandibular central incisors

49
Q

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

A

anteroposterior

50
Q

The primary dentition consists of 20 teeth including:

A
  1. incisors
  2. canines
  3. primary molars
51
Q

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

A

lower incisor; 8 months

52
Q

By _____ all primary teeth should be present

A

30 months

53
Q
A

Orthodontics I (10 decks)

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