LESSON 1 (Dental Anomalies) Flashcards
Name the DENTAL ANOMALIES in SIZE
Microdontia
Macrodontia
DENTAL ANOMALIES in number
*Anodontia
*False anodontia
*Supernumerary tooth
MESIODENS
PERIDENS DISTOMOLAR MESIOMOLAR PARAMOLAR TUBERCLE
Dental anomalies in SHAPE AND FORM involving crown
● FUSION
● GEMINATION
● TAURODONTISM
● DENS INVAGINATUS
● LEONG’S PREMOLAR
● PEG TOOTH
● HUTCHINSON’S TEETH
● TALON’S CUSPS
ERUPTION ANOMALY
PREMATURE
DELAYED
THIRD DENTITION
Dental anomalies in SHAPE AND FORM Involving root
● Too large or too small roots
● Accessory roots
● Fusion of roots
● Concrescence
● Enamel pearls
● Twisted root
● Dilaceration
What are the CLASSIFICATION OF IMPACTION
IN RELATION TO RAMUS & 2ND MOLAR
CLASS I CLASS II CLASS III
Used to describe teeth which are smaller than normal
MICRODONTIA
‘peg lateral’ is what condition?
MICRODONTIA
cone-shaped crown
Peg lateral
the opposite of microdontia and refers to teeth that are larger than normal.
MACRODONTIA
Has been associated with pituitary gigantism,
but is extremely rare
MACRODONTIA
in which all teeth are missing, may involve both deciduous and permanent dentition.
ANODONTIA
occurs as a result of extraction of all teeth.
False anodontia
sometimes applied to multiple unerupted teeth.
Pseudoanodontia
Involves one or more teeth and is a rather common condition.
Ex. Congenitially absend left maxillary central incisor resulting in underdevelopment of the maxilla and severe malocclusion
Hypodontia
SUPERNUMERARY TOOTH
extra tooth between maxillary central incisors
Mesiodens
SUPERNUMERARY TOOTH
extra tooth found elsewhere than in the midline of the arch
Peridens
SUPERNUMERARY TOOTH
extra teeth on the buccal or lingual side of
the maxillary molar
Paramolars
SUPERNUMERARY TOOTH
additional cusp on the
buccal surface of a permanent maxillary molar
Paramolar tubercle
ERUPTION ANOMALY
INVOLVING CROWN
Two tooth buds/germs fused or joined together
Fusion
ERUPTION ANOMALY
INVOLVING CROWN
One tooth bud and became two teeth
Gemination
ERUPTION ANOMALY
INVOLVING CROWN
o Bull
o The tooth has a big body but small extremities (big crown, pulp, coronal pulp but small roots)
Taurodontism
ERUPTION ANOMALY
INVOLVING CROWN
The tooth development is going inside
Dens invaginatus
ERUPTION ANOMALY
INVOLVING CROWN
The tooth development is going outside
Leong’s premolar or dens evaginatus
ERUPTION ANOMALY
INVOLVING CROWN
o Common in central or lateral incisors
o Usually central incisors with a notch on the
incisal edge
HUTCHINSON’S TEETH
ERUPTION ANOMALY
INVOLVING CROWN
o Usually found on the upper central incisors on
the lingual side
o These are over-developed cingulum
Talon’s cusps
abnormal space between teeth
Diastema
anomalies which arise from an attempt at division of a single tooth germ by an invagination, with resultant incomplete formation of two teeth.
GEMINATION
The structure is usually one with two completely or incompletely separated crowns that have a single root and root canal.
• ‘twinning’
GEMINATION
Was described as a peculiar dental anomaly in which the body of the tooth is enlarged at the expense of the roots.
‘bull-like’ teeth
TAURODONTISM
“Dens in dente”, tooth within a tooth
DENS INVAGINATUS
A developmental condition that appears clinically as an accessory cusp or a globule of enamel on the occlusal surface between the buccal and lingual cusps of premolars, unilaterally or bilaterally, although it has been reported to occur rarely on molars, cuspids, and incisors
DENS EVAGINATUS
An anomalous structure resembling an eagle’s talon, projects lingually from the cingulum areas of a maxillary or mandibular permanent incisor.
TALON CUSP
ERUPTION ANOMALY
INVOLVING ROOT
• A form of fusion which occurs after root formation has been completed.
• In this condition, teeth are united by cementum only.
CONCRESCENCE
ERUPTION ANOMALY
INVOLVING ROOT
Maxillary premolar with three roots rather than the usual two
Accessory roots/ supernumerary roots
INVOLVING ROOT
extra enamel
Enamel pearls
towards the labial
Labioversion
towards the buccal
Buccoversion
towards the lingual
Linguoversion
towards the mesial
Mesioversion
towards the distal
Distoversion
rotation of a tooth
on its long axis
torsoversion
crossing the line of occlusion
Supraversion
away from the line of occlusion
Infraversion
interchange in the position of
two permanent adjacent teeth located at the
same quadrant in the dental arch
Transposition
if the position of the tooth is in the
other arch
Migration
CLASSIFICATION OF IMPACTION
(IN RELATED TO RAMUS AND SECOND MOLAR)
Enough space between ramus and distal of
second molar
Class I
CLASSIFICATION OF IMPACTION
(IN RELATED TO RAMUS AND SECOND MOLAR)
Mesiodistal width of the third molar crown can
pass
Class I
CLASSIFICATION OF IMPACTION
(IN RELATED TO RAMUS AND SECOND MOLAR)
Space between the ramus and distal of second
molar is less than the mesiodistal width of the 3rd
molar crown
Class II
CLASSIFICATION OF IMPACTION
(IN RELATED TO RAMUS AND SECOND MOLAR)
All or most of the third molar is located within the
ramus
Class III
RELATIVE DEPTH OF 3RD MOLAR
Occlusal surface of the 3rd molar is the same
level as the occlusal surface of the 2nd molar
Position A
RELATIVE DEPTH OF 3RD MOLAR
Occlusal surface of the 3rd molar is located
between cervical line and occlusal place of the
2nd molar
Position B
RELATIVE DEPTH OF 3RD MOLAR
Occlusal surface of the 3rd molar is deeper than
the cervical line of the 2nd molar
Position C
POSITION OF LONG AXIS OF THE 3RD MOLAR IN RELATION TO THE 2ND MOLAR
● VERTICAL
● HORIZONTAL
● INVERTED
● MESIOANGULAR
● DISTOANGULAR
● BUCCOANGULAR
● LIGUOANGULAR
Cervical line of crown of third molar is in line of
occlusal plane of 2nd molar
Class A
between occlusal plane and cervical line of 2nd
CLASS B
is at or above cervical line of 2nd molar
CLASS C
Max.3rd molar impaction
● SA - with sinus approximation
● NSA - without sinus approximaiton ( 2mm or more )
