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 sequence of the eruption of the maxillary primary arch?

Answer 6

central incisor
lateral incisor
first molar
canine
second molar

Question 7

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

Answer 7

primary teeth have symmetrical crown shapes

Question 8

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

Answer 8

primary dentition has more interdental spacing

Question 9

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

Answer 9

“primate” spaces

Question 10

Where are the primate spaces found in the primary dentiton?

Answer 10

mesial to upper cuspids and distal to lower cuspids

Question 11

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

Answer 11

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

Question 12

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

Answer 12

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 13

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

Answer 13

Severe crowding will most probably occur in the permanent dentition

Question 14

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

Answer 14

Diastemas

Question 15

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

Answer 15

labial

Question 16

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

Answer 16

lingual

Question 17

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

Answer 17

is not

Question 18

At what age is the arch size usually fully formed?

Answer 18

8-9 years old

Question 19

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

Answer 19

primary teeth have no angulation of the incisors

Question 20

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

Answer 20

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

Question 21

What is the occlusal plane (OP)

Answer 21

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

Question 22

The occlusal plane is usually _______

Answer 22

curved

Question 23

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

Answer 23

passes through

Question 24

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

Answer 24

is tangent to

Question 25

Primary teeth are positioned ___° to the occlusal plane

Answer 25

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

Question 26

What is the curve of spee?

Answer 26

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 27

The convex aspect of the curve of Spee is pointing _________

Answer 27

inferiorly

Question 28

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

Answer 28

little curvature

Question 29

In the primary dentition, the curve of Spee is _____

Answer 29

flat

Question 30

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

Answer 30

worse

Question 31

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

Answer 31

vertical

Question 32

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

Answer 32

Minimal

Question 33

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

Answer 33

lower canine and the first primary molar

Question 34

What are the occlusal relations for the decidious dentition?

Answer 34

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 35

What is overjet?

Answer 35

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 36

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

Answer 36

most prominent central incisors

Question 37

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

Answer 37

labiolingual position and inclination of the maxillary and mandibular central incisors

Question 38

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

Answer 38

20

Question 39

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

Answer 39

8 months

Question 40

By __________ all primary teeth should be present

Answer 40

30 months

Question 41

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

Answer 41

worse

Question 42

What is leeway space?

Answer 42

Difference between M-D width of primary and permanent molars

Question 43

What is the leeway space on max and mand arch?

Answer 43

Max - 1.5mm per side Mand - 2.5mm per side - since we have more space on mand arch (2.5mm) then max arch (1.5mm) then the relationship is going to be a class I relationship because of the difference of the width of primary molars and PM

Question 44

What plane is normal in primary dentition?

Answer 44

Flush terminal plane There is also: Distal step - class II relationship Mesial step - class I and III relationship