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