lecture 3

Question 1

sequence of dentition development

Answer 1

32 teeth by 18 if 3rd molars present

Question 2

timing of eruption in max primary dentition

Answer 2

months

Question 3

lower primary arch eruption times

Answer 3

months

Question 4

overall time frame of primary eruption

Answer 4

8-29 months

Question 5

what if primary dentition erupts late

Answer 5

entire eruption pattern will shift back, this also causes late eruption of the secondary dentition

Question 6

1 vs 2 color

Answer 6

1 dentition more opaque/white
2 is more translucent/less opaque

Question 7

1 vs 2 symmetry

Answer 7

1 crowns are symmetrical M/D, 2 are not

Question 8

interdental spacing of 1 dentition

Answer 8

should be present to allow larger 2 teeth to erupt, especially in the anterior
may not be present in psoterior

Question 9

primate space

Answer 9

Larger spaces called “ primate” spaces are found mesial to upper cuspids and distal to lower cuspids

Question 10

what if there is no interdental spacing in the 1 dentition?

Answer 10

IF THERE IS NO INTERDENTAL SPACING
IN THE DECIDUOUS DENTITION, CROWDING OF
THE PERMANENT DENTITION WILL MOST
PROBABLY OCCUR ( Probability 75%).

Question 11

2 Lower anteriors erupt where relative to 1

results?

Answer 11

lingual=can decrease arch length causing crowding

Question 12

when there is crowding due to 2 lower I eruption what should you do right away?

Answer 12

may not intervene right away, interarch D may increase with age and correct this

Question 13

can ectopic eruption happen with interdental spacing

Answer 13

Even if interdental spacing is present, permanent teeth may still erupt ectopically. In this case, abnormal root resorption pattern may occur

Question 14

abnormal root resorb

Answer 14

can occur with ectopic eruption leading to failure of 1 exfoliation

Question 15

what could be happening here?

what could happen?

Answer 15

abnormal root resorb due to lingual eruption of the 2 dentition
B aspect of the 1 root may still be intact allowing tooth to remain
more teeth may erupt and cause further crowding or 1 could exfoliate and tongue may push 2 teeth outward

Question 16

what if 1 teeth show crowding

Answer 16

If there is crowding in the primary dentition, severe crowding will most probably occur in the permanent dentition, almost always

Question 17

what to do with 1 crowded teeth?

Answer 17

tx asap (expansion?)

Question 18

Diastemas between anterior primary teeth are important for?

Answer 18

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

Question 19

Upper and lower I eruption locations

Answer 19

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

Question 20

does arch size increase with 2 incisor eruptions

Answer 20

There is no significant increase in arch size after the eruption

Question 21

angulation of 1 incisors

Answer 21

none

Question 22

what 1 tooth is larger than the 2

Answer 22

2nd 1 M> 2nd PM

Question 23

Example of significant size differences between 1 and 2 dentition

Answer 23

Question 24

how can PM eruption be affected?

Answer 24

M drift of molars

Question 25

Occlusal plane (OP)

Answer 25

*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 26

1 tooth position to OP

Answer 26

Primary teeth are positioned 90 degrees to the occlusal plane

Question 27

curve of spee

Answer 27

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 28

curve of spee in 1 dentition

Answer 28

flat

Question 29

1 dentition occlusal relations variability

Answer 29

Less variability in occlusal relations than in the permanent dentition 1. Dentoalveolar compensations: (response of the dentoalveolar process to the skeletal dysplasia or to functional disturbance) are not fully expressed

Question 30

malocclusion diagnosed in 1 dentition, result with growth?

Answer 30

will get worse

Question 31

a 1 malocclusion os often what in regards to etiology

Answer 31

skeletal, hard for 1 to compensate with this

Question 32

1 dentition occlusal relations | upper/lower I overbite/jet upper C tip

Answer 32

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