Development Disturbance

Question 1

Presence of unusually small teeth
Teeth smaller than normal

Answer 1

Microdontia

Question 2

Presence of unusually large teeth
Teeth larger than normal

Answer 2

Macrodontia

Question 3

Total lack of tooth development
Frequently associated with hereditary Ectodermal dysplasia

Answer 3

Anodontia

Question 4

Lack of development of one or more teeth (<6
teeth are missing)

Answer 4

Hypodontia

Question 5

Subdivision of hypodontia
Lack of development of >6 teeth excluding third
molars

Answer 5

Oligodontia

Question 6

More common in permanent dentition - most common in maxilla
Anterior midline of maxilla - most common site
Maxillary molar area - most second common
site

Answer 6

Hyperdontia / suppernumerary teeth

Question 7

Small peg-shaped: usually presents as mesiodens
Develop with root ahead of or at an equivalent stage

Answer 7

Conical

Question 8

Occurs in the midline between the
maxillary central incisors; often has
conical or peg shape

Answer 8

Mesiodens

Question 9

Posses more than one cusps or tubercle
Barrel-shaped and may be invaginated
Root formation is delayed

Answer 9

Tuberculate

Question 10

Accessory cusp of an anterior tooth that is located most often on the palatal surface

Answer 10

Talon cusp

Question 11

Duplication of teeth in the normal series and is found at the end of a tooth series

Most common supplemental tooth -
permanent maxillary lateral incisors
Supplemental premolars and molars also occur

Answer 11

Supplemental

Question 12

Tooth lying lingual to, or buccal to, maxillary or mandibular molars

Answer 12

Paramolar

Question 13

Accessory fourth molar

Answer 13

DISTOMOLAR / DISTODENS

Question 14

any tumor or odontogenic origin
■Hamartomatous malformation

Answer 14

Odontome

Question 15

Prematurely erupted deciduous teeth mandibular central incisor
● Appearing at the time of birth - natal teeth
● Arising within the first 30 days of life - neonatal
teeth

Answer 15

Predeciduous teeth

Question 16

Teeth that cease to erupt before emergence
● Most frequently impacted teeth - mandibular
third molar

Answer 16

Impaction

Question 17

Fusion of two teeth from single enamel organ
● Anomalies which arise from an attempt at division of a single tooth germ by an invagination, with resultant incomplete formation
of two teeth

Answer 17

Gemination

Question 18

Joining of two developing tooth germs, resulting in a single large tooth structure
● May involve the entire length of the teeth, or it may involve the roots only - cementum and dentin are shared

Answer 18

Fusion

Question 19

Form of fusion in which adjacent, already formed teeth are joined by cementum

Answer 19

Conrescence

Question 20

Extraordinary curving or angulation of tooth roots

Answer 20

Dilaceration

Question 21

Accessory cusp that originated from the central groove or lingual ridge of the buccal cusp of a premolar or molar tooth

Relatively common developmental condition affecting predominantly premolar teeth (Leong’s premolar)

Answer 21

Dens evaginatus

Question 22

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

Answer 22

Dens in dente or dens invaginatus

Question 23

Variation in tooth form in which teeth have elongated crowns or apically displaced furcation, resulting in pulp chambers that have increased apical - occlusal height

Answer 23

Taurodontism

Question 24

Accessory roots are most commonly seen in mandibular canines, premolar, and molars (especially third molars)

Answer 24

Supernumerary root

Question 25

Ectopic enamel, may occasionally be found on the roots of teeth

Answer 25

Enamel pearl

Question 26

Ameloblasts are susceptible to various external factors that may be reflected in erupted teeth - extremely sensitive

Answer 26

ENVIRONMENTAL ENAMEL HYPOPLASIA

Question 27

Reduction in the quantity of enamel matrix

Answer 27

Enamel hypoplasia

Question 28

Reduction in the quantity of enamel maturation
Presents with a normal size and shape but demonstrates as of white, cream, yellow, or brown opacity

Answer 28

Enamel hypocalcification

Question 29

Ingestion of excess amounts of fluoride can result in significant enamel defects
Creates the appearances of white, chalky areas

Answer 29

Fluorosis