Developmental Teeth Abnormalities

Question 1

___________ refers to a reduced number of teeth.

Answer 1

Hypodontia

Question 2

___________ is the most common dental developmental anomaly.

Answer 2

Hypodontia

Question 3

T/F: Hypodontia is uncommon in deciduous dentition.

Answer 3

True

Question 4

____________ is when a patient lacks 6 or more teeth.

Answer 4

Oligodontia

Question 5

____________ is when a patient is missing all of their teeth.

Answer 5

Anodontia

Question 6

T/F: Hyperdontia is more frequent in permanent dentition than deciduous.

Answer 6

True

Question 7

T/F: Hyperiontia is more common in the mandible than the maxilla.

Answer 7

False

More common in maxilla

Question 8

What is a paramolar?

Answer 8

Supernumerary tooth found buccal or lingual to the normal molars

Question 9

What are the most common teeth to be affected with microdontia?

Answer 9

Maxillary laterals and third molars

Question 10

What is a distodens?

Answer 10

Extra molar at the end of the arch

Question 11

T/F: Macrodontia is more common than microdontia.

Answer 11

False

Question 12

What is the difference between gemination and fusion?

Answer 12

Gemination: one tooth bud; crown appears split; tooth count is normal

Fusion: two tooth buds fusing together to form a connected crown; share cementum and dentin but separate canals; reduced tooth count

Question 13

What is concrescence?

Answer 13

Two teeth connected by cementum alone

Uncommon, but most often in posterior maxilla

Question 14

Which teeth are most commonly affected with dens evaginatus?

Answer 14

Premolars

Question 15

T/F: Teeth with dens evaginatus will often become nonvital.

Answer 15

True

Trauma to extra cusp in developmental groove

Question 16

Which tooth is most commonly affected by dens invaginatus (dens in dente)?

Answer 16

Maxillary lateral incisor

Question 17

T/F: Tooth with dens invaginatus will become non-vital shortly after eruption.

Answer 17

True

Question 18

What is an enamel pearl?

Answer 18

Droplet of ectopic enamel

Question 19

Where are enamel pearls most often found?

Answer 19

Furcations of max/mand molars

Question 20

T/F: Enamel pearls may have pulp horns.

Answer 20

True

Question 21

_____________ is an enlargement of the body and pulp chamber of multirooted teeth.

Answer 21

Taurodontism

Question 22

Hypercementosis has a strong association with which disease of the bone?

Answer 22

Paget’s Disease

Question 23

T/F: Hypercementosis requires extraction of the teeth.

Answer 23

False

No treatment necessary/can cause problems with extractions

Question 24

What is dilaceration and what is the possible cause of it?

Answer 24

Curvature of the root

Possible cause is trauma to developing tooth

Question 25

What are the three main divisions of amelogenesis imperfecta?

Answer 25

Hypoplastic - inadequate deposition of matrix

Hypomaturation - incomplete mineralization

Hypocalcified - no significant mineralization

Question 26

____________ involves thin enamel of normal or decreased density. Teeth may be described as “snow-capped”.

Answer 26

Amelogenesis imperfecta

Question 27

T/F: Amelogenesis imperfecta will affect both primary and permanent teeth.

Answer 27

True

Question 28

Which disease causes teeth to appear translucent?

Answer 28

Dentinogenesis imperfecta

“Opalescent teeth” has similar look but not same genetic basis

Question 29

Which gene is mutated leading to dentinogenesis imperfecta?

Answer 29

DSPP

Question 30

T/F: Dentin dysplasia and dentinogenesis imperfect have autosomal dominant inheritance.

Answer 30

True

Question 31

How can you identify dentinogenesis imperfecta in radiographs?

Answer 31

Bulbous crowns with obliterated pulp

Question 32

What are the two types of dentin dysplasia?

Answer 32

Type 1: Radicular dentin dysplasia - rootless teeth with obliteration of pulp

Type 2: Coronal dentin dysplasia - enlarged pulp with “thistle tube” appearance and pulp stones; related to dentinogenesis imperfecta

Question 33

T/F: Teeth with dentin dysplasia may appear normal clinically.

Answer 33

True