07 Anomalies of Eruption and Exfoliation

Question 1

______ % of natal teeth are true primary teeth

Answer 1

90%

Question 2

When do neonatal teeth erupt

Answer 2

1st 30 days

Question 3

Which are more common neonatal v. natal teeth

Answer 3

natal

Question 4

Structures commonly mistaken for erupting primary teeth:

_____ nodules
dental ______ cysts
______ pearls

Answer 4

Bohn’s
Lamina
Epstein’s

Question 5

This is an island of bone attached to tooth

Answer 5

Eruption sequestrum

Question 6

What arch does eruption sequestrum typically happen in

Answer 6

mandibular

Question 7

This is a displacement or malposition of erupting teeth

Answer 7

Ectopic eruption

Question 8

What can cause ectopic eruption

Answer 8

crowding
over-retained primary teeth
supernmerary teeth
missing teeth
infection/caries

Question 9

What tooth is the most likely to have an ectopic eruption

Answer 9

Maxillary 1st molar (6-7 years)

Question 10

What percent of kids have and ectopic eruption

Answer 10

5% (22% with cleft lip/palate)

Question 11

When might ectopic eruption self correct?

Answer 11

Under age 7

tooth locked only in enamel/dentin

Question 12

When is self correction rare

Answer 12

over 7
locked into pulp
mesial angulation > 3mm
if 2nd primary molar is mobile

Question 13

This shows that a tooth came in ectopically and corrected

Answer 13

Resorption of the adjacent primary tooth

Question 14

What treatment can cause ectopic eruption

Answer 14

SSC fitted improperly

Question 15

This tooth normally erupts and resorbs the root of the primary canine

Answer 15

permanent lateral

Question 16

Lateral Incisor ectopic eruption Tx

1. extract _______ primary canine to allow possibility of midline ________
2. Make a lower lingual _______ arch to prevent _______ of permanent incisors
3. ortho and serial extraction

Answer 16

contralateral
normalization

2. holding, tippingEc

Question 17

ectopic eruption of central incisors

Answer 17

erupt lingually

Question 18

Treat ectopic maxillary central incisor

Answer 18

extract primary central immediately

Question 19

treat ectopic mandibular central incisor

Answer 19

let tooth exfoliate on own

Question 20

Where do ectopic canines erupt

Answer 20

facially over over retained primary canine

Question 21

Where do ectopic premolars erupt

Answer 21

facial to and over-retained molar

Question 22

When does a tooth become over-retained

Answer 22

adjacent to permanent tooth replacement for 6 months or more

Question 23

When do permanent incisors erupt

Answer 23

when 1/2 of more of root is complete

Canines/Premolars at 2/3 root completion

Question 24

Ankylosis

1. May occur at any time during _____
2. Consists of localized _______ of PDL space
3. May be _____ or bony
4. Diagnosis if the tooth remains _______ in the alveolus and the adjacent areas continue to grow
5. Permanent teeth after ______, complication of re-______

Answer 24

1. Eruption
2. Obliteration
3. Fibrous
4. Stationary
5. traume, implantation

Question 25

What percent of primary teeth get ankylosed?

Answer 25

7-14%

Question 26

What is the most common tooth to get ankylosed?

Answer 26

Mn 1st Primary Molar

Question 27

Impacted Maxillary Canines:

___% incidence
Treatment is _____ of primary canines

Answer 27

2

extraction

Question 28

What is the key to treatment and prevention of impacted canines

Answer 28

early diagnosis

Question 29

How do you look for impacted canines on an x-ray

Answer 29

Permanent canine is overlapping the pulp of the permanent lateral incisor

Question 30

What is the problem with an abnormal maxillary frenum

Answer 30

Diastema

Question 31

When should you order a frenectomy

Answer 31

after permanent incisors and canines have eruption and ortho is finished

Question 32

What does ankyloglossia mean

Answer 32

tongue tied

Question 33

What is the influence of premature primary molar loss on eruption of successor?:

1. 5 years or younger
2. 5-8
3. 8 +

Answer 33

1. Delayed eruption (bone reformed)
2. Little effect
3. Accelerated eruption

Question 34

This is dependent on duration, frequency and intensity

Answer 34

Sucking habits

Question 35

Consequences of too much paci/sucking

Answer 35

anterior open bite
palatal constriction
posterior x-bite
severe overjet

Question 36

Treatment for sucking habit

Answer 36

child must want to quit
don’t punish
use appliances

Question 37

Treatment for sucking

1. 0-4 years
2. 5-8
3. 8+

Answer 37

1. Pull out paci after kid is asleep
2. positive reinforcement/appliance
3. appliance/ortho