Ortho - Lecture 14: Impacted Teeth

Question 1

Tooth that has failed to erupt partially or completely to its correct position in the dental arch and its eruption potential has been lost

Answer 1

Impacted tooth

Question 2

Most common impacted tooth

Answer 2

Maxillary canine

Question 3

Impacted maxillary canines are twice as common in ___________

Answer 3

females

Question 4

The most common cause for impacted maxillary canines is inadequate _______ _________

Answer 4

arch length

Question 5

Eruption in an abnormal position (ex: transposition)

Answer 5

Ectopia

Question 6

Palatally impacted canines occur _______ of the time

Answer 6

2/3

Question 7

Labially impacted canines occur ______ of the time

Answer 7

1/3

Question 8

Palatally impacted canine or labially impacted canine?

Due to genetics

Answer 8

Palatally

Question 9

Palatally impacted canine or labially impacted canine?

Due to arch length discrepancy

Answer 9

Labially

Question 10

Palatally impacted canine or labially impacted canine?

85% had sufficient space

Answer 10

Palatally

Question 11

Palatally impacted canine or labially impacted canine?

17% had sufficient space

Answer 11

Labially

Question 12

What are the following causes of?

Genetics
Retained deciduous
Not enough space
Short lateral roots
Abnormal eruption sequence
Trauma to primary tooth bud
Premature root closure
Eruption into cleft

Answer 12

Canine impaction

Question 13

Palatally impacted canine or labially impacted canine?

Usually vertical

Answer 13

Labially

Question 14

Palatally impacted canine or labially impacted canine?

Usually horizontal

Answer 14

Palatally

Question 15

What age?

First evidence of permanent canine calcification

Answer 15

4-5 months

Question 16

What age?

Crown formation of permanent canine

Answer 16

5-6 years

Question 17

What age?

Eruption of permanent canine

Answer 17

11-12 years

Question 18

What age?

Completion of root of permanent canine

Answer 18

13-15 years

Question 19

What are the clinical signs of an impacted canine?

Answer 19

Delayed eruption
Prolonged retention of primary
Elevation of soft tissue
Distal migration of laterals

Question 20

Palatally impacted canine or labially impacted canine?

On a ceph, appears vertical and
coronal to the apices of the anterior teeth

Answer 20

Labially

Question 21

Palatally impacted canine or labially impacted canine?

On a ceph, appears horizontal and apical to the anterior teeth

Answer 21

Palatally

Question 22

Palatally impacted canine or labially impacted canine?

On a pano, appears larger and more blurry than the contralateral canine

Answer 22

Palatally

Question 23

Palatally impacted canine or labially impacted canine?

Detected earlier

Answer 23

Labially

Question 24

Palatally impacted canine or labially impacted canine?

Easier to manage

Answer 24

Labially

Question 25

Palatally impacted canine or labially impacted canine? May be transposed

Answer 25

Labially

Question 26

Palatally impacted canine or labially impacted canine? Watch for 6 month difference from contralateral canine

Answer 26

Palatally

Question 27

Palatally impacted canine or labially impacted canine? Treat early!

Answer 27

Palatally

Question 28

What are the tx options for impacted canines?

Answer 28

Exposure + natural eruption Exposure + ortho Ext + premolar substitution Reimplantation

Question 29

Palatally impacted canine or labially impacted canine? Usually need just simple uprighting and extrusive mechanics; anchorage preservation is chief concern

Answer 29

Labially

Question 30

Palatally impacted canine or labially impacted canine? During surgery, the flap design should preserve attached gingiva

Answer 30

Labially

Question 31

Palatally impacted canine or labially impacted canine? Closed eruption of apically repositioned flaps

Answer 31

Labially

Question 32

Palatally impacted canine or labially impacted canine? Must have adequate exposure for bonding

Answer 32

Labially

Question 33

Palatally impacted canine or labially impacted canine? Stabilize arch and make space

Answer 33

Palatally

Question 34

Palatally impacted canine or labially impacted canine? Full thickness flap is done (open or closed eruption)

Answer 34

Palatally

Question 35

Palatally impacted canine or labially impacted canine? Consider good hemostasis; bone removal if necessary

Answer 35

Palatally

Question 36

Why should you ext the primary canine if it is retained?

Answer 36

To facilitate eruption