Tooth Abnormalities

Question 1

Microdont

Answer 1

Small tooth

Question 2

Macrodont

Answer 2

large tooth

Question 3

Taurodont

Answer 3

Enlargement of the body and pulp chamber of a multi-rooted tooth with apical displacement of the pulpal floor and bifurcation

Question 4

Gemination

Answer 4

one trying to be two. Normal count

Question 5

Fusion

Answer 5

two trying to be one. missing one tooth in count

Question 6

Dilaceration

Answer 6

Sharp bend in roots

Question 7

Talon Cusp

Answer 7

A well-delineated additional cusp on the surface of an anterior tooth

Question 8

Dens evaginatus “Leong premolar”

Answer 8

Cusp-like elevation of enamel located in the central groove or lingual ridge of the buccal cusp of premolar or occasionally molar teeth
Usually bilateral
Usually mandible
50% of cases pulp extends into accessory cusp
Occlusal interference causes wearing/fracture
Pulpal necrosis

Question 9

Dens invaginatus “dens in dente”

Answer 9

deep surface invagination of tooth, lined by enamel

Question 10

Enamel Pearl

Answer 10

Hemispheric structures composed entirely of enamel or containing underlying dentin and pulp

Question 11

hypercementosis

Answer 11

excess cementum. PDL SURROUNDS THE ENTIRE STRUCTURE

Question 12

concrescence

Answer 12

union of two teeth with cementum

Question 13

Hypodontia

Answer 13

lack of development of teeth.

Oligodontia - missing 6+ not including 3rd molars

Question 14

Ectodermal dysplasia

Answer 14

Group of inherited conditions in which two or more ectodermally derived anatomic structures fail to develop.  
Skin 
Hair 
Nails 
Teeth 
Sweat glands

Question 15

retained deciduous teeth

Answer 15

self explanatory

Question 16

hyperdontia

Answer 16

supernumerary teeth

Question 17

impacted teeth

Answer 17

cease to erupt before emergence

Question 18

ankylosis

Answer 18

Anatomic fusion of cementum or dentin with the alveolar bone

Question 19

Extrinsic vs Intrinsic staining

Answer 19

Extrinsic
Tobacco, coffee, etc
Intrinsic
tetracycline, DI, internal resorbtion (pink tooth of mummery), resorcinol

Question 20

Fluorosis

Answer 20

Zones of yellow to dark brown discoloration “mottled enamel”
BILATERALLY SYMMETRIC

Question 21

Focal enamel hypoplasia “Turner’s tooth”

Answer 21

Enamel defect in permanent dentition caused by trauma or periapical inflammatory disease of the overlying deciduous tooth

Question 22

Chronologic enamel hypoplasia

Answer 22

fever during tooth development, looks like a band across teeth all in same level

Question 23

Amelogenesis Imperfecta

Answer 23

clincally thin enamel. discolored teeth. normal dentin and pulp chamber

Question 24

Dentinogenisis imperfecta

Answer 24

opalescent discoloration, bulbous crowns, cervical constriction, obliteration of pulp canals

Question 25

Osteogenesis imperfecta with opalescent teeth

Answer 25

Bone fractures, long bone and spine deformity, growth impairment, blue sclerae, hearing loss, Wormian bones in the skull, dental alterations clinically and radiographically identical to dentinogenesis imperfecta