Dental Anomalies

Question 1

total congenital absence of the entire primary or permanent dentitions

Answer 1

true anodontia

Question 2

referred to as hypodontia, involves one or more congenitally missing teeth from dentition

Answer 2

partial anodontia

Question 3

teeth that form in excess of the normal number of teeth for each quadrant

Answer 3

supernumerary teeth

Question 4

a small supernumerary tooth that forms between central incisors

Answer 4

mesiodens

Question 5

supernumerary teeth located distal to the third molars

Answer 5

distomolars

Question 6

peg shaped laterals

Answer 6

cone shaped lateral incisors

Question 7

splitting or twinning of a single forming tooth

Answer 7

gemination or twinning

Question 8

union of two adjacent tooth germs, always involving the dentin

Answer 8

fusion

Question 9

maxillary and mandibular incisors may be screwdriver shaped with a notched incisal edge from the passing of syphilis from mother to unborn baby

Answer 9

hutchinson’s incisors

Question 10

fusion of a supernumerary tooth which may appear similar to an extra cusp

Answer 10

accessory enamel projections

Question 11

a third lingual cusp developed on mandibular molars on lingual surface

Answer 11

tuberculum intermedium

Question 12

extra cusp located on distal marginal ridge

Answer 12

tuberculum sextum

Question 13

a small projection on the lingual surface of maxillary or mandibular anterior permanent teeth

Answer 13

talon cusp

Question 14

very small, but normally shaped teeth

Answer 14

microdontia

Question 15

very large, but normally shaped teeth

Answer 15

macrodontia

Question 16

a frequent occurring trait that reflects biologic differences between races

Answer 16

shovel shaped incisors

Question 17

small round nodules of enamel with a tiny core of dentin

Answer 17

enamel pearls

Question 18

very long pulp chamber without a constriction near the CEJ

Answer 18

taurodontia

Question 19

a severe bend or angular distortion of tooth root

Answer 19

dilaceration

Question 20

tooth within a tooth

Answer 20

dens in dente

Question 21

involves the superficial fusion or growing together of only the cementum of two adjacent tooth roots

Answer 21

concresence

Question 22

maxillary teeth often exhibit normal sized crowns with abnormally short roots

Answer 22

dwarfed roots

Question 23

formation of excessive cementum around the root of a tooth after the tooth has erupted

Answer 23

hypercementosis

Question 24

embedded teeth that fail to erupt into the oral cavity because of lack of eruptive force

Answer 24

unerupted teeth

Question 25

fail to erupt due to mechanic obstruction often related to the evolutionary decreasing size of jaw

Answer 25

impacted teeth

Question 26

tooth is located too far to labial surface

Answer 26

labioversion

Question 27

tooth is too lingual

Answer 27

linguoversion

Question 28

tooth is erupted beyond the occlusal plane

Answer 28

supraeruption

Question 29

tooth is shorter than occlusal plane

Answer 29

infraversion

Question 30

slight rotation of tooth

Answer 30

torsiversion

Question 31

tooth is rotated by 180 degrees

Answer 31

complete rotation

Question 32

loss of periodontal ligament space so the tooth root is fused to alveolar bone

Answer 32

ankylosis

Question 33

formation or development

Answer 33

plasia

Question 34

a disturbance in enamel forming cells during early enamel formation

Answer 34

enamel dysplasia

Question 35

hereditary disorder that affects the enamel formation of both dentitions

Answer 35

amelogenesis imperfecta

Question 36

condition caused during enamel formation by ingestion of a high concentration of fluoride compounds in drinking water that greatly exceeds the concentration recommended for controlling decay

Answer 36

fluorosis

Question 37

incomplete development of enamel seen as localized discolored spot or deformed area on a tooth

Answer 37

focal hypoplasia

Question 38

hereditary disorder that affects the dentin formation of both dentitions

Answer 38

dentinogenesis imperfecta

Question 39

wearing away of the enamel due to the movement of mandibular teeth against maxillary teeth

Answer 39

attrition

Question 40

excessive grinding together of teeth

Answer 40

bruxism

Question 41

wearing away of tooth structure by mechanical means

Answer 41

abrasion

Question 42

bending of the tooth cause by heavy occlusal forces

Answer 42

abfraction

Question 43

loss of tooth structure from chemical means

Answer 43

erosion