Tooth Abnormalities

Question 1

The presence of teeth physically smaller than average. Typically affects:

Max lateral incisors
Third molars

Answer 1

microdontia

microdont

Question 2

Presence of teeth physically larger than average. NOT used to describe teeth altered by fusion/gemination

often effect incisors and canines

Answer 2

Macrodontia “macrodont”

Question 3

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

Answer 3

Taurodont

Question 4

One tooth trying to be two.

A single enlarged tooth in which the tooth count is normal when the anomalous tooth is counted as one

Answer 4

Gemination “twinning”

Question 5

Two teeth trying to be one

A single enlarged tooth in which the tooth count reveals a MISSING tooth when the anomalous tooth is counted as one

Answer 5

Fusion

Question 6

An abnormal angulation or sharp bend in a tooth root

Answer 6

Dilaceration

Question 7

Well-delineated additional cusp on the surface of an anterior tooth

More common in the maxilla and in the permanent dentition

More frequently in Asian, Native Americans, Inuit people

Answer 7

Talon cusp

Question 8

cusp-like elevation of enamel located in the central groove or lingual ridge of the buccal cusp of premolar or sometimes molar teeth

usually bilateral

Usually mandible

50% of cases pulp extends into accessory cusp

More common in native americans, asians and inuit people

Answer 8

Dens EVaginatus “Leong premolar”

Question 9

Deep surface invagination of the crown or root that is lined by enamel

Answer 9

Dens INVAGINATUS “dens in dente”

Question 10

These project from the surface of the root, though to arise from localized bulging of the the odontoblastic layer

Most common affecting maxillary and mandibular permanent molars

Answer 10

Enamel pearl

Question 11

Non-neoplastic deposition of excessive cementum that is continuous with the normal radicular cementum

Answer 11

Hypercementosis

Question 12

Union of two fully formed teeth along the root surfaces by cementum

May be seen in developmental and post-inflammatory contexts

Answer 12

Concrescence

Question 13

Lack of development of one or more teeth

Answer 13

Hypodontia

Question 14

Lack of development of six or more teeth, excluding third molars

Answer 14

Oligodontia

Question 15

Group of inherited conditions in which two or more ectodermally derived anatomic structures fail to develop

Skin
Hair
Nails
Teeth
Sweat glands

Answer 15

Ectodermal dysplasia

Question 16

Development of an increased number of teeth “supernumerary teeth”

Answer 16

Hyperdontia

Question 17

Teeth that cease to erupt before emergence

Answer 17

Impacted teeth

Question 18

Cessation of eruption after emergence

Anatomic fusion of cementum or dentin with the alveolar bone

Answer 18

Ankylosis

Question 19

Tobacco stain is an?

Answer 19

extrinsic stain

Question 20

pulpal necrosis can cause this

Internal resoprtion or pink tooth is this

tetracycline can cause this

Resorcinol can cause this

Bile pigment can cause this

Answer 20

Intrinsic stain

Question 21

enamel defects secondary to excessive ingestion of fluoride

zones of yellow to dark brown discoloration “mottled enamel”

Answer 21

Fluorosis

Question 22

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

Answer 22

Focal enamel hypoplasia “Turner’s Tooth”

Question 23

Secondary to systemic influences during tooth development such as exanthematous fevers

Localization correlated with developmental age of affected teeth

first two years of life = anterior teeth and first moalrs
age 4-5 = canine, premolars, and second molars

Answer 23

chronologic enamel hypoplasia

Question 24

developmental alterations in the structure of the enamel in absence of systemic disease

Answer 24

Amelogenesis imperfecta

Question 25

Hereditary developmental disturbance of dentin in the absence of systemic disorder

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

Answer 25

Dentinogenesis imperfecta

Question 26

Osteopenia and bone fragility

Mutation in one of two type I collage genes

dental alterations clinically and radiographically identical to DI

Answer 26

Osteogenesis imperfecta with opalescent teeth

Question 27

Loss of tooth structure

Common things occur commonly

Answer 27

dental caries

Question 28

Loss of tooth structure secondary to tooth to tooth contact during occlusion and mastication

Answer 28

Attrition

Question 29

Loss of tooth structure caused by a non-bacterial chemical process

Answer 29

Erosion

Question 30

Pathologic loss of tooth structure secondary to mechanical action of external agent

Answer 30

Abrasion

Question 31

Loss of tooth structure from occlusal stress creating tooth flexure away from the point of loading

Answer 31

Abfraction

Question 32

Common loss of tooth structure accomplished by cells in the periodontal ligament

Answer 32

External resorption

Question 33

Uncommon loss of tooth structure accomplished by cells in the dental pulp

Answer 33

Internal resorption