Anomalies

Question 1

Total Anodontia

Answer 1

Never had any teeth

Question 2

Partial Anodontia

Answer 2

Never having one or more teeth

Question 3

Partial Anodontia-Most commonly missing perm. teeth

Answer 3

1) Third molars (especially maxillary)
2) Max LI (1-2%)
3) Mand 2P (1%)

Question 4

Partial Anodontia-Most commonly missing primary teeth

Answer 4

Mand CI

*Perm Mand CI can be mising too

Question 5

When/where do extra or supernumerary teeth occur

Answer 5

Maxillary and permanent dentition

Question 6

Mesiodens

Answer 6

Supernumerary tooth between Max CI

Question 7

Extra molars may be called

Answer 7

paramolar, distomolar, or fourth molar

Question 8

T o F: Supernumerary teeth will lead to an excessive number of teeth

Answer 8

False, may just replace a different tooth

Question 9

What teeth are most commonly supernumerary

Answer 9

1) Maxillary incisor area
2) Third molar area
3) Mand. premolar area

Question 10

What tooth most likely to have crown malformed?

Answer 10

3rd molar

Question 11

What teeth may be peg shaped?

Answer 11

Max LI (1-2%)
Max CI (Very rare)

Question 12

Gemination (twinning)

Answer 12

one crown
Double in width
One root-one pulp chamber
one canal
*i.e. there are still 4 incisors but can count 5

Question 13

Fusion

Answer 13

two adjacent crowns fuse
two roots-two pulp chambers
Two canals
*i.e. there are only 3 incisors but can count 4

Question 14

Gemination and fusion occur in perm or prim dentition

Answer 14

primary usually

Question 15

Hutchinson’s incisors

Answer 15

aka screwdriver teeth
Caused by congenital syphilis
Have V shape- dont confuse w/ fusion!

Question 16

Congential syphilis marked by Hutchinson’s incisors as well as ___________?

Answer 16

Mulberry molars

Molars with many tubercles on occlusal

Question 17

Unusually prominent ridge on facial surface most likely on _____?

Answer 17

Maxillary CI

Question 18

Types of extra cusps

Answer 18

Tuberculum intermedium-third (middle) lingual cusp on mand. molars
Tuberculum sextum-distal cusp on mand. molars

Question 19

Talon cusp

Answer 19

Similar to extra lingual cusp but have their own pulp horn

*Must do root canal to remove

Question 20

What teeth usually affected by macrodontia

Answer 20

Incisors and canines

Question 21

What teeth usually affected by microdontia

Answer 21

Max LI and 3M

Question 22

Shovel shaped max incisors more common in ____

Answer 22

Native americans, asian, mongoloid, and eskimos

Question 23

Dilaceration

Answer 23

severe bending at CEJ

Question 24

Flexion

Answer 24

Severe bending at location other than CEJ

Question 25

Dilaceration and flexion usually caused by?

Answer 25

Trauma

Question 26

Enamel pearls

Answer 26

Pearl of dentin w/ enamel cover | -more problematic near CEJ but do not remove them

Question 27

Taurodontia

Answer 27

think "toro"-dontia=Bull tooth More common in neanderthals, native americans, and eskimos Very large pulp chamber in molars

Question 28

Dens in dente aka Dens invaginatus

Answer 28

Tooth within a tooth | *allows communication w/ internal structure so must seal w/ composite

Question 29

Hypercementosis

Answer 29

Thickening of cementum caused by trauma or metabolic dysfunction Causes webbed roots

Question 30

Concresence of roots

Answer 30

joining of cementum of adjacent teeth AFTER eruption

Question 31

Dwarfed roots

Answer 31

Hereditary or caused by ortho treatment done too quickly | Localized-doesn't affect all teeth

Question 32

Accessory roots most common on what teeth in maxillary arch

Answer 32

First premolar

Question 33

Accessory roots most common on what teeth in mandibular arch

Answer 33

Canine and premolar (facial and lingual roots)

Question 34

Impacted tooth

Answer 34

Cannot erupt due to mechanical obstruction

Question 35

Unerupted tooth

Answer 35

does not have eruptive forces

Question 36

Transposition

Answer 36

tooth trades place with another tooth

Question 37

Ankylosis

Answer 37

Failure to complete eruption of permanent tooth due to trauma or infection Loss of pdl so root fuses to bone

Question 38

Ectopic

Answer 38

tooth erupts somewhere other than arch

Question 39

Types of enamel dysplasia

Answer 39

1) amelogenesis imperfecta 2) fluorosis 3) enamel damage from high fever 4) focal hypermaturation

Question 40

Amelogenesis imperfecta

Answer 40

Faulty enamel formation Hereditary Total or partial lack of enamel both dentitions

Question 41

Fluorosis

Answer 41

Too much fluoride during formation Mild=mottled enamel Severe=pitted enamel

Question 42

Enamel damage due to high fever causes

Answer 42

pitted enamel

Question 43

Focal enamel hypoplasia

Answer 43

aka turner's tooth | local trauma or infection

Question 44

Types of dentin dysplasia

Answer 44

dentinogenesis imperfecta | tetracycline stain

Question 45

Dentinogenesis imperfecta

Answer 45

faulty dentin formation hereditary both dentitions

Question 46

Attrition

Answer 46

wear of enamel and dentin due to opposing tooth

Question 47

Abrasion

Answer 47

Wear due to mechanical means

Question 48

Abfraction

Answer 48

bending of tooth due to heavy occlusion with enamel chippin off at cervical

Question 49

Erosion

Answer 49

wear due to chemical agents

Question 50

Bruxism

Answer 50

40 min of contact every hour during night