Impaction and Ectopic Eruption

Question 1

______ is defined as the developmental absence of one or more
teeth excluding the third molars.
•It is one of the most common dental anomalies and has a negative impact on
both esthetic and function.

Answer 1

Hypodontia

Question 2

More than 6 teeth missing.

Answer 2

Oligodontia:

Question 3

No teeth at all.

Answer 3

Anodontia:

Question 4

What should we do for _______?
•Accept the missing tooth/teeth.
•If any space left may need Orthodontic treatment for closing the spaces.
•Plan to replace missing tooth/teeth.
•Opening the space and replace missing tooth/ teeth with prosthetic work.
•Investigate any syndromic origin and address them by medical
referral.

Answer 4

Hypodontia

Question 5

_______ is the condition of having teeth
that appear in addition to the regular number of teeth (32 in the
average adult)

Answer 5

Hyperdontia (Supernumerary tooth )

Question 6

Most supernumerary teeth are located in the ______
region.

Answer 6

anterior maxillary

Question 7

Supernumerary tooth which appears in the maxillary midline is called
a

Answer 7

mesiodens.

Question 8

Are supernumerary teeth more common in primary or perm dentition?

Answer 8

Perm

Question 9

What should we do for ______?
•It is important to detect, evaluate, and treat supernumerary teeth as
soon as possible since the additional teeth will present both cosmetic
and functional problems for the affected individual.
•Treatment depends on the type and position of the supernumerary
tooth and on its effect on adjacent teeth.
•As a majority of supernumerary teeth cause clinical problems,
treatment generally consists of removal of the teeth when possible.

Answer 9

Supernumerary tooth

Question 10

______ of the first permanent molar is a local eruption disturbance
characterized by the abnormal eruptive pathway of FPM causing the
permanent tooth to be locked under the distal undercut of the second
primary molar and failure to erupt into normal occlusal plane.

Answer 10

Ectopic eruption

Question 11

This is a condition where teeth are found with their occlusal surface
below the adjacent teeth, long after they should have reached
occlusion

Answer 11

OVer retained primary tooth/ankylosis

Question 12

DX of _____
•On conventional radiographs, obliteration of the periodontal ligament can
usually be demonstrable, but may not appear if the ankylosed area is very
small.
•As the ankylosis progresses, the roots of the impacted teeth become less
distinguishable from the surrounding bone because of reduced radiopacity of
the roots.
•Panoramic, occlusal, intraoral periapical radiographs and CT can be used to
examine the space between the infraoccluded and the adjacent teeth.

Answer 12

Ankylosed teeth

Question 13

PRIMARY MOLARS WITH SUCCESSOR)
•In majority of the cases these teeth exfoliated normally.
•A ____ month delay in exfoliation considered acceptable.

Answer 13

6 month

Question 14

If the progression was good, primary teeth without successors may be left in the dental arch and used as a
natural space maintainer to preserve _____ and ______

Answer 14

arch length and the alveolar bone height

Question 15

What % of population has canine impaction?

Answer 15

2%

Question 16

Males or females more likely to have canine impaction?

Answer 16

Females

Question 17

What is main reason for canine impaction?

Answer 17

Crowding

Question 18

It has been suggested that the following clinical signs might be indicative of
_______:
1. Delayed eruption of the permanent canine or prolonged retention of the
deciduous canine beyond 14–15 years of age.
2. Absence of a normal labial canine bulge.
3. Presence of a palatal bulge.
4. Delayed eruption, distal tipping, or migration of the lateral incisor.

Answer 18

canine impaction

Question 19

Is impacted canine more likely to self correct distal or mesial to midline of canine?

Answer 19

91% distal
64% mesial