Development of the Primary Dentition

Question 1

sequence of eruption

Answer 1

Deciduous Dentition
20 teeth.
Mixed Dentition
Primary dentition +Permanent molars =
(erupt distally to the primary dentition)
Erupting permanent teeth
(6 to 13 years old)
Permanent dentition 32 teeth

Question 2

Deciduous Dentition
– teeth.

Answer 2

20

Question 3

Primary dentition +Permanent molars =

Answer 3

(erupt distally to the primary dentition)

Question 4

Erupting permanent teeth

Answer 4

(6 to 13 years old)

Question 5

Permanent dentition — teeth

Answer 5

32

Question 6

Lower
central
incisor

Answer 6

8months

Question 7

Upper
central
incisor

Answer 7

10months

Question 8

Upper
lateral
incisor

Answer 8

11months

Question 8

Upper
lateral
incisor

Answer 8

11months

Question 9

Lower
lateral
incisor

Answer 9

12months

Question 10

First
primary
molars

Answer 10

16months

Question 11

Canines

Answer 11

20months

Question 12

Lower
second
molar

Answer 12

27months

Question 13

Upper
second
molar

Answer 13

29months

Question 14

Larger spaces called “ primate” spaces are found

Answer 14

mesial
to upper cuspids and distal to lower cuspids

Question 15

RULE #1: IF THERE IS NO INTERDENTAL SPACING
IN THE DECIDUOUS DENTITION,

Answer 15

CROWDING OF
THE PERMANENT DENTITION WILL MOST
PROBABLY OCCUR ( Probability 75%).

If there is crowding in the primary dentition, severe crowding will mos
probably occur in the permanent dentition

Question 16

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

Answer 16

Diastemas

Question 17

The upper incisors erupt to the — of primary teeth.
Lower incisors tend to erupt to the —.

Answer 17

labial
lingual

Question 18

There is no significant increase in arch size after the

Answer 18

eruption

Question 19

Some primary posterior teeth are — than
their successor

Answer 19

larger

Question 20

Upper second premolar:
Upper second primary
molar:

Answer 20

7.00mm
8.2mm

Question 21

Lower second premolar:
Lower second primary
molar:

Answer 21

7.00mm
9.9mm

Question 22

Occlusal plane (OP)

Answer 22

*An imaginary surface that passes through the occlusion of
the teeth. This surface usually is curved and is, strictly
speaking, not a plane, but commonly is approximated by
one (straight line in the lateral view), based on specific
reference points with in the dental arches. The maxillary
occlusal plane passes through the occlusal cusps of the
posterior teeth and the incisal edges of the maxillary
incisors. The mandibular occlusal plane is tangent to the
occlusal cusps of the posterior teeth and the incisal edges
of the mandibular incisors.

Question 23

Primary teeth are positioned — degrees to
the occlusal plane

Answer 23

90

Question 24

curve of Spee

Answer 24

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. The convex aspect of the curve of Spee is pointing
inferiorly. The concept was first introduced by F. Graf
von Spee in 1890, who theorized that the extension of
this curve would be tangent to the anterior surface of
the mandibular condyles, bilaterally.

Question 25

In the primary dentition, the curve of Spee
is –

Answer 25

flat

Question 26

DECIDUOUS DENTITION
— variability in occlusal relations than in
the permanent dentition
1. Dentoalveolar compensations:

Answer 26

Less

(response of
the dentoalveolar process to the skeletal
dysplasia or to functional disturbance) are
not fully expressed

Question 27

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

Answer 27

get worse during growth

Question 28

DECIDUOUS DENTITION
Occlusal relations
(3)

Answer 28

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 29

Overjet (Sagittal overbite)

Answer 29

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. When not otherwise specified, the term is generally
assumed to refer to the most prominent central incisors.
The extent of overjet is determined primarily by the
differences of labiolingual position and inclination of the
maxillary and mandibular central incisors. Only in a minority of
cases is the anteroposterior skeletal relationship reflected
directly in the amount of overjet

Question 30

DECIDUOUS DENTITION
* Genetic and epigenetics
* Altering functional environment or neuromuscular
pattern or introducing habits such as digit sucking can

Answer 30

alter skeleton and occlusion resulting in malocclusion

Question 31

• The primary dentition consist of

Answer 31

20 teeth: Incisors, Canines and primary molars

Question 32

• First tooth( lower incisor) appears around the age of —months. By — months all primary
  teeth should be present

Answer 32

8
30

Question 33

• The primary occlusion presents different characteristics when compared to the permanent
  dentition.
• If a malocclusion is present in the primary dentition, it will

Answer 33

probably get worse with age and in
the permanent dentition.