primary dentition

Question 1

primary eruption time frame

Answer 1

6-30 months

Question 2

tooth eruption pattern overall

Answer 2

Question 3

maxillary primary teeth eruption pattern

Answer 3

CI> LI> M1> M2> C

Question 4

man primary teeth eruption pattern

Answer 4

CI> LI> M1> M2> C

Question 5

Characteristics of the deciduous

dentition

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

interdental spacing of primary dentition

Answer 6

desireable to have some space between teeth but not too much or too little

Question 7

primate spaces

Answer 7

Larger spaces called “ primate” spaces are found mesial

to upper cuspids and distal to lower cuspids

Question 8

no interdental space?

Answer 8

IF THERE IS NO INTERDENTAL SPACING
IN THE DECIDUOUS DENTITION, CROWDING OF
THE PERMANENT DENTITION WILL OCCUR in most cases

Question 9

•Diastemas between anterior primary teeth are important to:

Answer 9

to get space for permanent incisor eruption

Question 10

upper and lower incisor eruption relative to the primary ones

Answer 10

•The upper incisors erupt to the labial of primary teeth. Lower incisors tend to erupt to the lingual.

Question 11

arch size with permanent incisor eruption

Answer 11

There is no significant increase in arch size during the eruption of the permanent incisor

Question 12

lack of primary tooth angulation

Answer 12

do not have angles with the occlusal plane, non-optimal function with condyles but doesn’t matter

Question 13

tooth size of the primary dentition

Answer 13

Anterior primary teeth are smaller, more space used up

Some primary posterior teeth are larger than their successor (molars replaced by pre molars), allows extra space

Question 14

Occlusal plane (OP)

Answer 14

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

Question 15

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

Answer 15

90

Question 16

In the primary dentition, the

curve of Spee is ____

Answer 16

flat

Question 17

what if curve of spee is present in primary dentition

Answer 17

severe malocclusion will result

Question 18

Dentoalveolar compensations:

Answer 18

response of the dentoalveolar process to the skeletal dysplasia or to functional disturbance, are
not fully expressed
can only compensate a little

Question 19

malocclusion diagnosed in the primary dentition

Answer 19

If a malocclusion is diagnosed in the primary dentition, it will most probably get worse during growth, due to large amount of growth that will occur

Question 20

ideal occlusal relations of the primary dentition
upper and lower incisors?
OJ/OB?
upper canine tip position?

Answer 20

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 21

overbite/overjet of the primary dentition

Answer 21

overbite should be 10-30%

overjet about 1-2mm

Question 22

occlusal classes of primary/mixed dentitions

Answer 22

Question 23

normal occlusal changes are due to?

Answer 23

skeletal growth, not from dental changes
• altering functional environment or neuromuscular pattern or introducing habits such as digit sucking can alter skeleton and occlusion resulting in malocclusion

Question 24

functional disturbances and malocclusion

Answer 24

Functional disturbances or thumb sucking habits are involved in the etiology of malocclusions
➢Unfavorable skeletal patterns lead to malocclusion, even in young patients
➢Ectopic dental eruption may lead to malocclusion

Question 25

Skeletal malocclusions

Answer 25

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.