Developmental Teeth Abnormalities Flashcards
___________ refers to a reduced number of teeth.
Hypodontia
___________ is the most common dental developmental anomaly.
Hypodontia
T/F: Hypodontia is uncommon in deciduous dentition.
True
____________ is when a patient lacks 6 or more teeth.
Oligodontia
____________ is when a patient is missing all of their teeth.
Anodontia
T/F: Hyperdontia is more frequent in permanent dentition than deciduous.
True
T/F: Hyperiontia is more common in the mandible than the maxilla.
False
More common in maxilla
What is a paramolar?
Supernumerary tooth found buccal or lingual to the normal molars
What are the most common teeth to be affected with microdontia?
Maxillary laterals and third molars
What is a distodens?
Extra molar at the end of the arch
T/F: Macrodontia is more common than microdontia.
False
What is the difference between gemination and fusion?
Gemination: one tooth bud; crown appears split; tooth count is normal
Fusion: two tooth buds fusing together to form a connected crown; share cementum and dentin but separate canals; reduced tooth count
What is concrescence?
Two teeth connected by cementum alone
Uncommon, but most often in posterior maxilla
Which teeth are most commonly affected with dens evaginatus?
Premolars
T/F: Teeth with dens evaginatus will often become nonvital.
True
Trauma to extra cusp in developmental groove
Which tooth is most commonly affected by dens invaginatus (dens in dente)?
Maxillary lateral incisor
T/F: Tooth with dens invaginatus will become non-vital shortly after eruption.
True
What is an enamel pearl?
Droplet of ectopic enamel
Where are enamel pearls most often found?
Furcations of max/mand molars
T/F: Enamel pearls may have pulp horns.
True
_____________ is an enlargement of the body and pulp chamber of multirooted teeth.
Taurodontism
Hypercementosis has a strong association with which disease of the bone?
Paget’s Disease
T/F: Hypercementosis requires extraction of the teeth.
False
No treatment necessary/can cause problems with extractions
What is dilaceration and what is the possible cause of it?
Curvature of the root
Possible cause is trauma to developing tooth
What are the three main divisions of amelogenesis imperfecta?
Hypoplastic - inadequate deposition of matrix
Hypomaturation - incomplete mineralization
Hypocalcified - no significant mineralization
____________ involves thin enamel of normal or decreased density. Teeth may be described as “snow-capped”.
Amelogenesis imperfecta
T/F: Amelogenesis imperfecta will affect both primary and permanent teeth.
True
Which disease causes teeth to appear translucent?
Dentinogenesis imperfecta
“Opalescent teeth” has similar look but not same genetic basis
Which gene is mutated leading to dentinogenesis imperfecta?
DSPP
T/F: Dentin dysplasia and dentinogenesis imperfect have autosomal dominant inheritance.
True
How can you identify dentinogenesis imperfecta in radiographs?
Bulbous crowns with obliterated pulp
What are the two types of dentin dysplasia?
Type 1: Radicular dentin dysplasia - rootless teeth with obliteration of pulp
Type 2: Coronal dentin dysplasia - enlarged pulp with “thistle tube” appearance and pulp stones; related to dentinogenesis imperfecta
T/F: Teeth with dentin dysplasia may appear normal clinically.
True
