Abnormalities Of Teeth

Question 1

Anodontia is seen in

Answer 1

Ectodermal dysplasia

Question 2

Most commonly missing teeth in permenant dentition

Answer 2

Third molars
Max lateral incisors
Mand premolar

Question 3

Supernumerary teeth most commonly seen in

Answer 3

Cleidocranial dysplasia

Question 4

Natal teeth

Answer 4

Arising at birth

Question 5

Neonatal teeth

Answer 5

Arising after 30 days of life

Question 6

Macrodontia is seen in

Answer 6

Pituatary gigantism
Gigantism
Facial hemihyperplasia

Question 7

Microdontia seen in

Answer 7

Pituitary dwarfism
Down syndrome
Hypohidrotic extodermal dysplasia
Congenital syphilis

Question 8

Gemination

Answer 8

Partial division of a single tooth bud into bifid crown with one common root

Question 9

Fusion

Answer 9

Fusion of two separate tooth buds into one

Question 10

Dens in dente

Answer 10

Tooth within a tooth due to invagination of the IEE during development

LATERAL INCISORS

Question 11

Dens evaginatus

Answer 11

Evagination of the IEE
Common in premolar - mandible
Cusp of carabelli
Centre tubercle
Tuberculated cusp
Shovel shaped incisors - APERTS syndrome

Question 12

Ankylosis also known as

Answer 12

Replacement resoprtion
Fusion of cementum directly into the bone

Question 13

Tooth commonly ankylosed

Answer 13

Mand primary 1st molar
Mand primary 2nd molar
Mand permanent 1st molar
Max canine

Question 14

Hypercementosis features

Answer 14

Accumulation of secondary cementum on the apical half roots of vital mand molar and premolars

Bulbous enlargement on xray (no changes to PDL and lamina dura

Question 15

Hypercementosis commonly seen in

Answer 15

Paget’s disease
Hyperthyroidism
Pituitary gigantism
Supra eruption
Perio infection
Occlusal trauma

Question 16

Taurodontism is commonly seen with

Answer 16

Hypodontia
Cleft palate
Cleft lip

Question 17

Ectopic enamel/enamel pearls commonly seen in

Answer 17

Maxillary molars
Well defined radiopaque nodules
Cells of HERS do not migrate away from dentin

Question 18

Cervical enamel extension

Answer 18

Dipping of enamel from CEJ to bifurcation of molar teeth

Max molars

Question 19

Genes most commonly mutated in amelogenesis imperfecta

Answer 19

Amelogenin
Enamelin
Kallikrein 4
MMP20

Question 20

Most common form of amelogenesis imperfecta

Answer 20

Hypoplastic - not enough matrix is laid down
Quantity is less
Quality is good
Open contacts of teeth

Question 21

Hypomaturation - type 2

Answer 21

Quality is bad
Quantity is good
Matrix is not matured
Enamel chips easily
Dental sensitivity
Radiopacity similar to dentine

Question 22

Hypo calcification type 3

Answer 22

Matrix not calcified
Sever chipping
Lack of enamel proteins
Quantity is normal
Quality is affected
Less radiopaque than dentin

Question 23

Enamel hypoplasia

Answer 23

More localised
Not hereditary
Environmental
Both dentition can be affected
Lack of contacts
Staining of chipped teeth

Question 24

Type 1 dentiogenesis dysplasia

Answer 24

Conjunction with osteogenesis dysplasia
Bone fractures
Blue sclera
Obliterated pulp chanbers
Bulbous crowns
Short roots
Amber colour
Primary dentition

Question 25

Most common form if dentinogenesis imperfecta

Answer 25

Type 2

Question 26

Type 3 dentinogenesis imperfecta

Answer 26

Multiple pulp exposures
Periapical radiolucencies
Shell like app
Large pulp chambers and root canal

Question 27

Dentinal dysplasia type

Answer 27

Radicular- affect roots
Extremely short roots, obliterated pulp chambers, periapical radiolucencies - mobility

Coronal- enlarged pulp chambers, thistle tube app, pulp stones, no periapical radiolucencies

Question 28

Most common type of dentinal dysplasia

Answer 28

Radicular

Question 29

Regional odontodysplasia commonly seen in

Answer 29

Max any region
More common in permanent teeth
Ghost teeth - enlarged pulp chamber