radiographic interpretation of dental anomalies part 1)...radiographic interpretation of dental...

Radiographic interpretation

of

part 1))Dental Anomalies

By

Ahmed M bakry

Dental anomalies

Developmental Anomalies

indicates that a particular developmentalThe term

the formation of the duringanomaly occurred

tooth or teeth, from initiation at about the sixth

week in utero to eruption.

Developmental Anomalies

variation of number -1

•Increase

•Decrease

Increase in number

Supernumerary teeth are that develop in addition to

normal complement. The tooth form may be :

normal (supplemental ) or abnormal(supernumerary)

The order of frequency of supernumerary teeth is:

,mesiodensthe

th4( distomolarmaxillary molar),

maxillary paramolar (buccal to first molar )

Mesiodens

is a Paramolar

supernumerary tooth

in the molar region.

The paramolar is

obstructing the path

of eruption of the third

molar.

The occlusal surface

of the paramolar is

facing the occlusal

surface of the

unerupted third molar.

May be called, in jest,

"kissing molars".

Distomolar

Multiple supernumerary teeth have been associated with a number of syndromes such as cleidocranial dysplasia

A

f

f

e

c

t

e

d

p

a

t

i

e

n

t

s

o

f

t

e

n

h

a

v

e

h

y

p

o

p

l

a

s

t

i

c

o

r

a

b

s

e

n

t

c

l

a

v

i

c

l

e

s

a

n

d

h

a

v

e

t

h

e

f

l

e

x

i

b

i

l

i

t

y

t

o

b

r

i

n

g

t

h

e

i

r

s

h

o

u

l

d

e

r

s

c

l

o

s

e

t

o

g

e

t

h

e

r

i

n

t

h

e

m

i

d

l

i

n

e

Missing teeth

1- absence of one tooth (hypodontia )

2- absence of numerous teeth ( oligodontia )

3- failure of all teeth to develop (anodontia )

Total anodontia of permanent teeth and partial

anodontia (hypodontia) of deciduous teeth as a

result of agenesis of teeth. The patient suffered

from a syndrome called ectodermal dysplasia

2-Variation of size of teeth

macrodontia

Macrodontia involves a tooth or teeth being

larger than normal in size with proportional

enlargement of pulp chamber, crown, and

root

microdontia

Microdontia implies the abnormal

smallness of a single or multiple teeth.

This is most commonly an isolated

anomaly such as a peg lateral

3-ABNORMALITIES IN

POSITION OF TEETH

Transposition

Transposition is the

condition in which two

teeth have exchanged

position

Retained tooth

Retained deciduous

second molar

undergoing resorption

of the crown.

Ankylosed tooth

Ankylosed third

molar. Ankylosis is

the union of

cementum to the

surrounding bone

without the

intervening

periodontal ligament space

4-Variation of shape

(morphology )

F

u

s

i

o

n

G

e

m

i

n

a

t

i

o

n

C

o

n

c

r

e

s

c

e

n

c

e

D

e

n

s

i

n

d

e

n

t

e

D

e

n

s

e

v

a

g

i

n

a

t

u

s

T

a

l

o

n

c

u

s

p

T

a

u

r

o

d

o

n

t

i

s

m

D

i

l

a

c

e

r

a

t

i

o

n

H

y

p

e

r

c

e

m

e

n

t

o

s

i

s

E

n

a

m

e

l

P

e

a

r

l

A

t

t

r

i

t

i

o

n

A

b

r

a

s

i

o

n

E

r

o

s

i

o

n

fusion

•combining of adjacent tooth germ

-* occurs in deciduous and permenant teeth

-* reduced number of the teeth in the arch

-*teeth joined by dentin or enamel

Gemination

* tooth bud of single

tooth attempts to

divide.

normal number

occur in both

dentitions

* Single root and root

canal

* involve enamel

,dentin and

cementum

Taurodontism

•longitudinally enlarged pulp chambers.

crown is normal shape and size, but the

body is enlongated and the roots are short

•occur in either permenant or primary

dentitions ( or both ).

* not recognizable clinically.

Dilaceration

Enamel pearl

Dens in Dente

Dens Evaginatus

Talon cusp

The talon cusp is an

accessory cusp

located on the

lingual surface of

maxillary or

mandibular teeth.

may produce

occlusal

disharmony.

Concrescence

has been occurring after root formationfusion Concrescence is a form of completed,

. It is developmental in origin. united by their cementumresulting in teeth The involved

most teeth may erupt partially or may completely fail to erupt. Concrescence is commonly

. It can maxillary second and third molarsseen in association with the also occur with a

, concrescence may be difficult to On a radiographsupernumerary tooth. distinguish from

of closely positioned teeth unless additional superimposed imagesradiographs are taken

no ray beam angulation. This condition is of -with changes in x

, unless one ofsignificance

the involved teeth requires extraction.

Hypercementosis

Thank you