lecture 12 - dental anomalies

Question 1

anomaly

Answer 1

deviation from normal usually related to embryonic development that may result in the absence, excess, or deformity of body parts

Question 2

anodontia

Answer 2

absence of teeth

Question 3

hypodontia

Answer 3

missing one or two teeth

Question 4

most commonly missing in order

Answer 4

1. third molars
2. maxillary lateral incisors
3. mandibular second premolars
   canines least likely

Question 5

supernumerary teeth

Answer 5

extra teeth
90% occurrences on maxilla

Question 6

mesiodens

Answer 6

small supernumerary teeth forms between central incisors

Question 7

peg shaped laterals

Answer 7

develop from one lobe instead of four
could be genetic or disturbances during development

Question 8

gemination or twinning

Answer 8

splitting of a single forming tooth
tooth could is normal!!!!!

Question 9

fusion

Answer 9

union of two tooth germs always involving the dentin
one less tooth count!!!!!

Question 10

what two crown disturbances can happen from a mother passing syphilis to her unborn baby

Answer 10

hutchinson’s incisors and mulberry molars

Question 11

hutchinson’s incisors

Answer 11

screwdriver shaped, broader cervically, notched incisal edge

Question 12

mulberry molars

Answer 12

“berry like” tubercles on occlusal surface with no distinguishable cusps

Question 13

enamel pearls

Answer 13

small round nodules of enamel with a tiny core of dentin
can be felt with an explorer or probe

Question 14

taurodontia - bull or prism teeth

Answer 14

very long pulp chamber without constriction at CEJ
american indians and artic population

Question 15

dilaceration or flexion

Answer 15

severe bend or angular distortion of a tooth root

Question 16

dens in dente

Answer 16

tooth within a tooth
developmental resulting from the invagination of the enamel organ within the crown of a tooth

Question 17

dwarfed roots

Answer 17

normal crowns small roots

Question 18

why do un-erupted teeth fail to erupt

Answer 18

because of lack of eruptive force

Question 19

why do impacted teeth fail to erupt

Answer 19

because of mechanical obstruction
ex: not enough space

Question 20

transposition

Answer 20

misplaced teeth
canine where a lateral incisor should be

Question 21

ankylosis

Answer 21

loss of periodontal ligament space so the tooth root is fused to the alveolar bone and won’t erupt

Question 22

enamel dysplasia

Answer 22

disturbance in the enamel-forming cells (ameloblasts) during early enamel formation
ex: amelogenesis imperfecta, fluorsis, high fever causing, focal hypoplasia

Question 23

dentin dysplasia

Answer 23

occur more frequently than those in enamel
ex: dentinogenesis imperfecta, tetracycline stain,

Question 24

is changes in tooth shape after tooth eruption considers anomolies

Answer 24

no because they are from injuries

Question 25

attrition

Answer 25

wearing away of enamel fur to movement
teeth-to-teeth
bruxism

Question 26

abrasion

Answer 26

wearing away of tooth structure by mechanical force
tooth brush abrasion, tobacco use

Question 27

erosion

Answer 27

loss of tooth structure by chemical means
beverages, acid reflux, bulemia

Question 28

abfraction

Answer 28

cervical loss of tooth structure thought to occur from tooth “bending” under heavy occlusal forces