Abnormalities Of Teeth Flashcards
Anodontia is seen in
Ectodermal dysplasia
Most commonly missing teeth in permenant dentition
Third molars
Max lateral incisors
Mand premolar
Supernumerary teeth most commonly seen in
Cleidocranial dysplasia
Natal teeth
Arising at birth
Neonatal teeth
Arising after 30 days of life
Macrodontia is seen in
Pituatary gigantism
Gigantism
Facial hemihyperplasia
Microdontia seen in
Pituitary dwarfism
Down syndrome
Hypohidrotic extodermal dysplasia
Congenital syphilis
Gemination
Partial division of a single tooth bud into bifid crown with one common root
Fusion
Fusion of two separate tooth buds into one
Dens in dente
Tooth within a tooth due to invagination of the IEE during development
LATERAL INCISORS
Dens evaginatus
Evagination of the IEE
Common in premolar - mandible
Cusp of carabelli
Centre tubercle
Tuberculated cusp
Shovel shaped incisors - APERTS syndrome
Ankylosis also known as
Replacement resoprtion
Fusion of cementum directly into the bone
Tooth commonly ankylosed
Mand primary 1st molar
Mand primary 2nd molar
Mand permanent 1st molar
Max canine
Hypercementosis features
Accumulation of secondary cementum on the apical half roots of vital mand molar and premolars
Bulbous enlargement on xray (no changes to PDL and lamina dura
Hypercementosis commonly seen in
Paget’s disease
Hyperthyroidism
Pituitary gigantism
Supra eruption
Perio infection
Occlusal trauma
Taurodontism is commonly seen with
Hypodontia
Cleft palate
Cleft lip
Ectopic enamel/enamel pearls commonly seen in
Maxillary molars
Well defined radiopaque nodules
Cells of HERS do not migrate away from dentin
Cervical enamel extension
Dipping of enamel from CEJ to bifurcation of molar teeth
Max molars
Genes most commonly mutated in amelogenesis imperfecta
Amelogenin
Enamelin
Kallikrein 4
MMP20
Most common form of amelogenesis imperfecta
Hypoplastic - not enough matrix is laid down
Quantity is less
Quality is good
Open contacts of teeth
Hypomaturation - type 2
Quality is bad
Quantity is good
Matrix is not matured
Enamel chips easily
Dental sensitivity
Radiopacity similar to dentine
Hypo calcification type 3
Matrix not calcified
Sever chipping
Lack of enamel proteins
Quantity is normal
Quality is affected
Less radiopaque than dentin
Enamel hypoplasia
More localised
Not hereditary
Environmental
Both dentition can be affected
Lack of contacts
Staining of chipped teeth
Type 1 dentiogenesis dysplasia
Conjunction with osteogenesis dysplasia
Bone fractures
Blue sclera
Obliterated pulp chanbers
Bulbous crowns
Short roots
Amber colour
Primary dentition
Most common form if dentinogenesis imperfecta
Type 2
Type 3 dentinogenesis imperfecta
Multiple pulp exposures
Periapical radiolucencies
Shell like app
Large pulp chambers and root canal
Dentinal dysplasia type
Radicular- affect roots
Extremely short roots, obliterated pulp chambers, periapical radiolucencies - mobility
Coronal- enlarged pulp chambers, thistle tube app, pulp stones, no periapical radiolucencies
Most common type of dentinal dysplasia
Radicular
Regional odontodysplasia commonly seen in
Max any region
More common in permanent teeth
Ghost teeth - enlarged pulp chamber
