dental anamolies

Question 1

What is Anodontia?

Answer 1

genetic disorder when someone has no teeth. Its extremely rare in its pure form. It usually is accompanied with other abnormalities

Question 2

what is hypodontia?

Answer 2

absence from 1-6 teeth

Question 3

what is oligodontia?

Answer 3

absence of more than 6 teeth

Question 4

what is associated with anodontia?

Answer 4

ectodermal dysplasias ( its seen in primary or secondary)

Question 5

total anodontia ( aka true anodontia)

Answer 5

total congenital absence entire primary and secondary dentition. Sex linked genetic trait. Its an abnormal development of ectoderm.

Question 6

symptoms of ectodermal dysplasia and total anodontia

Answer 6

course hair, brittle nails, affects sebaceous sweat and salivary glands

Question 7

what is partial anodontia?

Answer 7

referred to as congenitally missing teeth. Involves 1 or more missing teeth. Tendancy for missing the same teeth runs in families.

Question 8

what action is required for partial anotondia?

Answer 8

radiographs to make sure theyre really gone and not impacted

Question 9

most common missing teeth in partial anodontia are…

Answer 9

third molars ( especially maxillary), then maxillary lateral incisors, mandibular second premolars

Question 10

which is least likely to be absent from the dentitions?

Answer 10

canines

Question 11

most common areas for supernumerary teeth

Answer 11

maxillary incisor area, third molar areas, mandibular premolar area.

Question 12

Mesiodens

Answer 12

forms between central maxillary incisors, May be unerupted and diastema space may be present. It can also look like a molar.

Question 13

supernumerary teeth in third molar area

Answer 13

distal to 3rd molar and more common in maxillary. Often called distomolars, paramolars, or fourth molars. They rarely erupts

Question 14

supernumerary teeth in mandibular premolar area

Answer 14

most commonly between first and second premolar regions

Question 15

8 different crown morphologies

Answer 15

third molars, peg lateral incisor, gemination ( twinning), fusion, hutchinsons ( congenital syphilis), accessory cusps, variations in tooth size, shovel-shaped incisors

Question 16

3rd molars

Answer 16

maxillary 3rd molars have the most variable crown shape of all teeth.

Question 17

peg-shaped maxillary lateral incisors

Answer 17

1-2 % of population has this, develops from 1 lobe instead of 4

Question 18

gemination ( twinning)

Answer 18

when a forming tooth splits but never really separates. They are double in width with a common canal. Most common in maxillary incisors and canines

Question 19

fusion

Answer 19

when 2 adjacent tooth germs unite and involves dentin. More commonly in anterior teeth, primary teeth, and mandibular incisor area.

Question 20

fusion looks similar to what?

Answer 20

to gemination. Fusion has a fused 2 separate pulp chambers in radiograph

Question 21

how can you tell the difference between fusion and germination?

Answer 21

germination is 2 crowns with one root, fusion is 2 crowns and 2 roots.

Question 22

hutchinsons incisors

Answer 22

caused by congenital syphyllis. May be screw driver shaped with a notched incisal edge and broad cervically

Question 23

mulberry molars

Answer 23

look like mulberries with tubercles

Question 24

accessory cusps, tubercles, or ridges

Answer 24

involves hyperplasia- increased cell numbers and hypertrophy- increased cell size

Question 25

tuberculum intermedium

Answer 25

extra midlingual cusp on mandibular molars.

Question 26

tuberculum sextum

Answer 26

extra cusp on distal marginal ridge

Question 27

Talon cusp

Answer 27

small projection on lingual surface of permanent incisors

Question 28

microdontia

Answer 28

very small but normal shaped teeth

Question 29

macrodontia

Answer 29

very large but normal shaped teeth

Question 30

shovel-shaped maxillary incisors

Answer 30

not a true anomaly, occur mostly in Asian, Mongoloid, Artic, and Native American population

Question 31

what are enamel pearls?

Answer 31

nodules of enamel with tiny core of dentin and can cause periodontal problems

Question 32

taurodontia

Answer 32

pulp chamber is very large without constriction near the CEJ. Only in permanent teeth

Question 33

Dilacerations ( flexion)

Answer 33

severe bends in roots

Question 34

Dens in dente

Answer 34

tooth within a tooth. Abnormality that results in a tooth invagination of enamel organ within the crown of a tooth

Question 35

Concrescence

Answer 35

superficial fusion of only cementum of 2 teeth. They usually join after eruption. Most frequent in maxillary molar

Question 36

dwarfed roots

Answer 36

small roots caused from braces moving to quick. Osteoblasts cant keep up with osteoclasts.

Question 37

hypercemenntosis ( thickening of cementum)

Answer 37

excess formation of cementum after tooth has erupted. Caused by trauma, metabolic dysfunction, or periapical inflammation

Question 38

malpositioned ( transposed teeth)

Answer 38

teeth are in wrong order

Question 39

ankylosis

Answer 39

started by infection or trauma to periodontal ligament. The root is truly fused to the alveolar process

Question 40

Enamel dysplasia

Answer 40

a disturbance in the enamel forming cells during formation. It may be hereditary or caused by trauma like high fever, nutrition deficiencies, or excess fluoride.

Question 41

amelogenesis imperfecta

Answer 41

faulty enamel formation

Question 42

enamel hypoplasia

Answer 42

incomplete development of enamel

Question 43

focal enamel hypoplasia ( turners tooth)

Answer 43

from local trauma or infection. Trauma causes problems with mineralization during formation

Question 44

Dentinogenesis imperfecta

Answer 44

faulty dentin formation. No dentin means no bulk on teeth

Question 45

Tetracycline stain

Answer 45

is a drug taken while tooth is forming that causes the teeth to be ugly and gray like professor dumbledores

Question 46

most unusual dentition

Answer 46

mandibular molars have maxillary molar anatomy