DEVELOPMENT OF THE PRIMARY DENTITION

Question 1

Deciduous Dentition

— teeth.

Answer 1

20

Question 2

Deciduous Dentition

Answer 2

Primary dentition +Permanent molars =

erupt distally to the primary dentition

Question 3

Mixed Dentition

Answer 3

Erupting permanent teeth

6 to 13 years old

Question 4

Permanent dentition — teeth

Answer 4

32

Question 5

Characteristics of the deciduous

dentition (5)

Answer 5

A. Symmetrical crown shapes
B. Interdental spacing
C. No angulation of the incisors
D. Less variability in occlusal relations than the permanent dentition
E. Arch width changes with growth

Question 6

Larger spaces called “ primate” spaces are found

Answer 6

mesial

to upper cuspids and distal to lower cuspids

Question 7

RULE #1: IF THERE IS NO INTERDENTAL SPACING

IN THE DECIDUOUS DENTITION,

Answer 7

CROWDING OF

THE PERMANENT DENTITION WILL OCCUR

Question 8

— between anterior primary teeth are

important to get space for permanent incisor eruption

Answer 8

Diastemas

Question 9

The upper incisors erupt to the — of primary

teeth. Lower incisors tend to erupt to the —

Answer 9

labial

lingual

Question 10

There is no significant increase in — size during the

eruption of the permanent incisors

Answer 10

arch

Question 11

Anterior primary teeth are —

Answer 11

smaller

Question 12

Some primary posterior teeth are

— than their successor

Answer 12

larger

Question 13

Upper second premolar

Answer 13

7.00mm

Question 14

Upper second primary

molar

Answer 14

8.2mm

Question 15

Lower second premolar

Answer 15

7.00mm

Question 16

Lower second primary

molar

Answer 16

9.9mm

Question 17

Occlusal plane (OP)

Answer 17

• 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 18

Primary teeth are positioned —
degrees to the occlusal plane
(Permanent teeth are not)

Answer 18

90

Question 19

In the primary dentition, the

curve of Spee is —

Answer 19

flat

Question 20

DECIDUOUS DENTITION
Less variability in — relations than in
the permanent dentition

Answer 20

occlusal

Question 21

1. Dentoalveolar compensations:

Answer 21

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

Question 22

If a malocclusion is diagnosed in the

primary dentition, it will

Answer 22

most

probably get worse during growth

Question 23

DECIDUOUS DENTITION
Occlusal relations (3)

Answer 23

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 24

DECIDUOUS DENTITION

•normal occlusal changes are due to

Answer 24

skeletal

growth, not from dental changes

Question 25

DECIDUOUS DENTITION
• altering functional environment or
neuromuscular pattern or introducing habits
such as digit sucking can

Answer 25

alter skeleton and

occlusion resulting in malocclusion

Question 26

Functional disturbances or thumb sucking habits are

involved in the etiology of malocclusions (2)

Answer 26

➢ Unfavorable skeletal patterns lead to malocclusion,
even in young patients
➢Ectopic dental eruption may lead to malocclusion

Question 27

Skeletal malocclusions (2)

Answer 27

• The upper and/or lower jaws (maxilla, mandible) are not aligned
properly in relation to cranial base
• Strong genetic influence. Some claim that function can create significant
skelatal malocclusions also.