Development of the primary dentition

Question 1

How many teeth are the in the deciduous dentition?

Answer 1

20

Question 2

The permanent molars erupt ________ to the primary dentition

Answer 2

distally

Question 3

When do the permanent teeth erupt?

Answer 3

6-13 years old

Question 4

How many teeth are the in the permanent dentition?

Answer 4

32 teeth

Question 5

What is the sequence of the eruption of the mandibular primary arch?

Answer 5

central incisor
lateral incisor
first molar
canine
second molar

Question 6

What is the emergence/exfoliation of the primary mand central incisor?

Answer 6

emergence: 6-10 months
exfoliation: 6-7 years

Question 7

What is the emergence/exfoliation of the primary mand lateral incisor?

Answer 7

emergence: 10-16 months
exfoliation: 7-8 years

Question 8

What is the emergence/exfoliation of the primary mand canine?

Answer 8

emergence: 17-23 months
exfoliation: 9-12 years

Question 9

What is the emergence/exfoliation of the primary mand 1st molar?

Answer 9

emergence: 14-18 months
exfoliation: 9-11 years

Question 10

What is the emergence/exfoliation of the primary mand second molar?

Answer 10

emergence: 23-31 months
exfoliation: 10-12 years

Question 11

What is the sequence of the eruption of the maxillary primary arch?

Answer 11

central incisor
lateral incisor
first molar
canine
second molar

Question 12

What is the emergence/exfoliation of the primary max central incisor?

Answer 12

emergence - 8-12 months
exfoliation - 6-7 years

Question 13

What is the emergence/exfoliation of the primary max lateral incisor?

Answer 13

emergence - 9-13 months
exfoliation - 7-8 years

Question 14

What is the emergence/exfoliation of the primary max first molar?

Answer 14

emergence - 13-19 months
exfoliation - 9-11 years

Question 15

What is the emergence/exfoliation of the primary max canine?

Answer 15

emergence - 16-22 months
exfoliation - 10-12 years

Question 16

What is the emergence/exfoliation of the primary max second molar?

Answer 16

emergence - 25-33 months
exfoliation - 10-12 years

Question 17

What is the difference between primary/permanent dentition in terms of shape?

Answer 17

primary teeth have symmetrical crown shapes

Question 18

What is the difference between primary/permanent dentition in terms of spacing?

Answer 18

primary dentition has more interdental spacing

Question 19

Larger spaces in primary dentition called _______________ are found mesial to upper cuspids and distal to lower cuspids

Answer 19

“primate” spaces

Question 20

Where are the primate spaces found in the primary dentiton?

Answer 20

mesial to upper cuspids and distal to lower cuspids

Question 21

If there is no interdental spacing in the deciduous dentition… what will happen in the permanent dentition?

Answer 21

crowding of the permanent dentition will most probably occur (75% of the time)

“Rule #1”

Question 22

Even if interdental spacing is present, permanent teeth may still erupt ___________

Answer 22

ectopically
- In this case, abnormal root resorption pattern

instead of resorbing the root of primary tooth it resorbs bone lingual to the primary root

Question 23

If there is crowding in the primary dentition, what will occur in the permanent dentition

Answer 23

Severe crowding will most probably occur in the permanent dentition

Question 24

_________ between anterior primary teeth are important to get space for permanent incisor eruption

Answer 24

Diastemas

Question 25

The permanent upper incisors erupt to the ________ of primary teeth.

Answer 25

labial

Question 26

The permanent Lower incisors tend to erupt to the _________ to the primary teeth.

Answer 26

lingual

Question 27

There is or is not significant increase in arch size after the eruption of the permanent incisors

Answer 27

is not

Question 28

At what age is the arch size usually fully formed?

Answer 28

8-9 years old

Question 29

What is the difference between primary/permanent dentition in terms of angulation?

Answer 29

primary teeth have no angulation of the incisors

Question 30

What is the difference between primary/permanent dentition in terms of size?

Answer 30

- Anterior primary teeth are smaller than permanent teeth - Some primary posterior teeth are larger than their successor (primary molars versus permanent premolars)

Question 31

What is leeway space?

Answer 31

difference in width b/w primary teeth and the permanant teeth that replace them

Question 32

Maxillary leeway space:

Answer 32

1.5 mm

Question 33

Mandibular leeway space:

Answer 33

2.5 mm

Question 34

What is the occlusal plane (OP)

Answer 34

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

Question 35

The occlusal plane is usually _______

Answer 35

curved

Question 36

The maxillary occlusal plane _____________ the occlusal cusps of the posterior teeth and the incisal edges of the maxillary incisors.

Answer 36

passes through

Question 37

The mandibular occlusal plane ____________ the occlusal cusps of the posterior teeth and the incisal edges of the mandibular incisors.

Answer 37

is tangent to

Question 38

Primary teeth are positioned ___° to the occlusal plane

Answer 38

90° | in the permanent dentition they are not 90°

Question 39

What is the curve of spee?

Answer 39

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.

Question 40

The convex aspect of the curve of Spee is pointing _________

Answer 40

inferiorly

Question 41

Normal curve of Spee in the permanent dentition has a...

Answer 41

little curvature

Question 42

In the primary dentition, the curve of Spee is _____

Answer 42

flat

Question 43

If a malocclusion is diagnosed in the primary dentition, it will probably get _______ during growth

Answer 43

worse

Question 44

The occlusal relation in the deciduous dentition... Upper and lower incisors are _______

Answer 44

vertical

Question 45

The occlusal relation in the deciduous dentition... ___________ overbite and overjet

Answer 45

Minimal

Question 46

The occlusal relation in the deciduous dentition... Upper canine tip is positioned in the embrasure between the _________________________

Answer 46

lower canine and the first primary molar

Question 47

What are the occlusal relations for the decidious dentition?

Answer 47

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 48

What is this showing?

Answer 48

overbite

Question 49

What is overjet?

Answer 49

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.

Question 50

When not otherwise specified, the term "overjet" is generally assumed to refer to the...

Answer 50

most prominent central incisors

Question 51

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

Answer 51

labiolingual position and inclination of the maxillary and mandibular central incisors

Question 52

The primary dentition consist of ___ teeth: Incisors, Canines and primary molars

Answer 52

20

Question 53

First tooth (lower incisor) appears around the age of ________

Answer 53

8 months

Question 54

By __________ all primary teeth should be present

Answer 54

30 months

Question 55

If a malocclusion is present in the primary dentition, it will probably get _________ with age and in the permanent dentition.

Answer 55

worse