Localized Disturbances in Eruption

Question 1

What is the alteration of normal eruption path?
a. ectopic eruption
b. impaction
c. primary retention
d. secondary retention

Answer 1

a. ectopic eruption

Question 2

What is the cessation of eruption due to physical barrier such as bone, teeth, soft tissue (gum)?
a. ectopic eruption
b. impaction
c. primary retention
d. secondary retention

Answer 2

b. impaction

Question 3

What is cessation of eruption after emergence?
a. ectopic eruption
b. impaction
c. primary retention
d. secondary retention

Answer 3

d. secondary retention

Question 4

What is cessation of eruption prior to emergence?
a. ectopic eruption
b. impaction
c. primary retention
d. secondary retention

Answer 4

c. primary retention

Question 5

What is the prevalence of an ectopic eruption of a 1st permanent molar?

Answer 5

• 5% in general population
• 22% in cleft patients
• 20% in siblings of patients with ectopic eruption

Question 6

What are the most common etiologies of 1st permanent molar ectopic eruption?

Answer 6

greater mesial angulation and/or greater width of 1st permanent molar

Question 7

T/F: Self-correction is usually not possible in 1st permanent molar ectopic eruption.

Answer 7

False!
2/3 actually self-correct

Question 8

How do you treat a mild ectopic 1st permanent molar?

Answer 8

observe

Question 9

How do you treat a moderate ectopic 1st permanent molar?

Answer 9

brass ligature, spring clip, distalizing appliance

Question 10

How do you treat a severe ectopic 1st permanent molar?

Answer 10

extract primary molar, distalize permanent molar

Question 10

Which side do ectopic mandibular incisors typically erupt?

Answer 10

lingually

Question 11

What is ectopic mandibular incisors often a good indication of?

Answer 11

incipient crowding

Question 12

What is the treatment ectopic mandibular incisors?

Answer 12

extract primary incisors (all 4) due to insufficient space (and possibly canines- serial extraction)

Question 13

How do teeth get self-corrected?

Answer 13

normal activity and placement of the tongue to push teeth out counteracted by lips and cheeks pushing in

Question 14

When do we only extract the central incisors (not laterals) in ectopic mandibular incisors?

Answer 14

when there is enough space

Question 15

When do we take a pano if thought to have ectopic teeth?

Answer 15

mixed dentition

don’t go by age, go by mixed dentition

Question 16

Why is it important that we detect ectopic canines as early as we can?

Answer 16

20% result in severe root resorption of adjacent teeth

Question 17

What’s a popular treatment for ectopic permanent canine?

Answer 17

palatal expansion

• slow palatal expansion (wires outside mouth)
• rapid palatal expansion (screws inside mouth )

Question 18

What is success rate of rapid palatal expander (RME)? What is success rate with no tx?

Answer 18

RME= 65.7%
no tx= 13.6%

Question 19

What are the other treatment options for ectopic maxillary canines?

Answer 19

• extract primary canines and first molars
• if class II molar relationship, headgear
• flap the gum tissue to expose the canine and put brackets on it to pull towards correct position. ACTIVE
• surgically expose/put hole and allow exposure down to CEJ so they grow correctly. PASSIVE

Question 20

What is the name of the stage preceding the eruption of permanent canines?

Answer 20

ugly duckling stage

Question 21

Why is laterals erupting before centrals bad?

Answer 21

Not the normal eruption sequence. Centrals usually erupt before lateral

Question 22

Where should you expose the tooth if trying to cause eruption?

Answer 22

below the mucogingival line because if above the line, no keratinized tissue and will continue to have recession and can lose bone

Question 23

What is ankylosis?

Answer 23

union of tooth root to alveolar bone due to lack of PDL

Question 24

What will happen if you put braces on an ankylosed tooth?

Answer 24

brackets on the an ankylosed tooth can cause everything to move

Question 25

What are the steps of a submerged tooth?

Answer 25

first undergo variable degrees of root resorption and then become ankylosed to bone

Question 26

What is the most commonly affected tooth for ankylosis of deciduous teeth?

Answer 26

mandibular second deciduous molar