Dental Anomalies 2

Question 1

anomalies of shape

Answer 1

dens evaginatus, dens invaginatus

Question 2

anomalies of structure

Answer 2

enamel and dentin

Question 3

anomalies of eruption

Answer 3

ectopic eruption, ankylosis, natal/neonatal teeth

Question 4

dens evaginatus

Answer 4

evagination of the inner enamel epithelium

Question 5

dens evaginatus anterior teeth

Answer 5

extra cusp in cingulum region
talon shape
may extend to the incisal edge

Question 6

dens evaginatus posterior teeth

Answer 6

extra cusp in the central groove
most common in premolars

Question 7

dens evaginatus clinical considerations

Answer 7

occlusal interference
plaque trap
pulp exposure

Question 8

dens invaginatus

Answer 8

invagination of the inner enamel epithelium
dens in dente
location: max incisor or canines most common

Question 9

dens invaginatus clinical findings

Answer 9

deep lingual pit
deep/long lingual groove
enamel and dentin in the invagination may be defective or absent
explorer stick in pit/groove

Question 10

dens invaginatus clinical considerations

Answer 10

plaque
direct communication between pulp and oral cavity

Question 11

anomalies enamel

Answer 11

amelogenesis imperfecta : genetic
enamel hypoplasia : systemic, localized

Question 12

amelogenesis imperfecta main types

Answer 12

hypoplastic (most common)
hypomaturation
hypocalcification

ALL teeth affected

Question 13

hypoplastic AI

Answer 13

predominantly AD
decreased enamel quantity/normal quality
radiographically: decreased enamel thickness
clinically: teeth small, open contacts, temperature sensitivity
anterior open bite

Question 14

hypomaturation AI

Answer 14

normal quantity of enamel
lack of enamel maturation
low mineral content
porous mottled surface
enamel easily fractured
decreased enamel radiodensity

Question 15

hypocalcification AI

Answer 15

normal quantity of enamel
poorly calcified
enamel easily fractured: incisal edges

Question 16

acquired developmental enamel defects

Answer 16

an enamel deficiency/defect encountered during enamel formation
systemic causes, local causes

Question 17

acquired developmental enamel defects systemic causes

Answer 17

fever
low birth weight
vitamin deficiency
chromosomal defects
neurological defects
allergies/asthma
radiation
no known cause

Question 18

molar-incisor hypomineralization

Answer 18

first permanent molars/incisors
may be no determined cause
often secondary to fever/infection
mild/moderate/severe
temperature sensitive
post-eruptive breakdown/caries

Question 19

acquired developmental enamel defects local causes

Answer 19

trauma
infection

Question 20

anomalies dentin

Answer 20

dentinogenesis imperfecta: inherited/genetic
regional odontodysplasia: not inherited

Question 21

dentinogenesis imperfecta

Answer 21

inherited
all teeth in both dentitions affected
more common than AI

Question 22

dentinogenesis imperfecta types

Answer 22

Shields Type I, Shields Type II

Question 23

Shields Type I

Answer 23

with osteogenesis imperfecta
brittle bones
bowing of the limbs
bi-temporal bossing
blue sclera
primary teeth more severely affected

Question 24

Shields Type II

Answer 24

autosomal dominant
hereditary opalescent dentin
primary and permanent teeth affected equally

Question 25

dentinogenesis Imperfecta Type II clinical findings

Answer 25

amber translucency
enamel fractures from dentin
severe attrition
abscess in absence of caries

Question 26

dentinogenesis imperfecta type II radiographic findings

Answer 26

bulbous crowns
slender roots
pulp chamber obliteration: abnormal, continuous proliferation of dentin matrix
pulp canals - small, ribbon-like
root fractures
stainless steel crowns

Question 27

regional odontodysplasia clinical findings

Answer 27

delayed eruption or lack of eruption
defective enamel and dentin formation
erupted teeth are dysmorphic
frequently abscess soon after eruption

Question 28

regional odontodysplasia radiographic findings

Answer 28

ghost teeth
decreases radiodensity
thin layer of enamel/dentin
large pulp chambers

Question 29

regional odontodysplasia tx

Answer 29

extraction, prosthetic replacement

Question 30

anomalies of eruption

Answer 30

ectopic eruption: max 1st perm molar, mand perm incisors
anyklosis: primary molars
natal and neonatal teeth

Question 31

ectopic eruption maxillary perm 1st molars

Answer 31

prevalence: 3-4%
mesioangular eruption path
primary second molar: distal root resorption, dental/periodontal abscess (uncommon)

Question 32

ectopic eruption mand perm incisors

Answer 32

central or lateral: excessive lingual eruption position
prevalence 10%

Question 33

ectopic eruption mandibular permanent incisors etiology and tx

Answer 33

etiology: abnormal eruption path, transitional crowding, arch length deficiency
tx: mobile - observe or extract, not mobile -extract
tongue will usually move into the arch

Question 34

ankylosis etiology and prevalence

Answer 34

etiology: fusion of cementum with alveolar bone at anytime during eruption… does not have to be whole tooth
overall prevalence: 1.3-38.5%, most common - primary molars
50% of patients - more than 1 ankylosed tooth

Question 35

ankylosis clinical findings

Answer 35

below plane of occlusion
lack of physiologic mobility

Question 36

ankylosis radiographic findings

Answer 36

lack of lamina dura, PDL space
more common with congenitally missing permanent successor

Question 37

natal and neonatal teeth

Answer 37

rare
location: mand central incisors
normal/hypoplastic/dysmorphic
must diagnose radiographically
most are not supernumerary

Question 38

riga fede

Answer 38

lingual tongue ulceration
smooth incisal edge
composite resin
extract

Question 39

natal and neonatal teeth indications for extraction

Answer 39

excessive mobility: aspiration risk
feeding difficulties
supernumerary