dental abnormalities Flashcards
What is a supernumerary tooth?
A tooth that is an addition to the normal dentition
What is a supplemental tooth?
A supernumerary with the same morphology as a normal tooth
What is the word for a tooth that is smaller than normal?
Microdont
What is another word for a supernumerary distal to the dentition?
Distodens
What age would you expect to see third molars start to calcify and therefore appear on radiographs?
8-10
What is dens in dente?
When the enamel organ in alginates into the dental papilla before mineralisation resulting in a deep, funnel shaped invagination within the tooth
Tooth within a tooth appearance
What are the risks of leaving an ectopic canine in situ?
External root resorption of the adjacent teeth
Dentigerous cyst formation
What is the word for an upside down tooth?
Inverted
What is the word to describe teeth that are switched in position?
Transposed
What is gemination?
The development of 2 conjoined teeth from a single tooth bud
What is fusion?
The joining of 2 tooth buds resulting in 2 conjoined teeth
What is taurodontism?
Elongation of the body of the tooth and apical displacement of the pulpal floor resulting in a vertically elongated pulp chamber and root canal
Which procedures can be complicated by taurodontism and why?
Endodontic treatment
The openings of the root canals will be abnormally deep within the access cavity
Extraction - the root furcation might be positioned too far apically for the forcep beaks to engage
What dental issues are associated with amelogenesis imperfecta?
Aesthetic concerns
Dentine hypersensitivity
Increased caries
Increased tooth wear
What are potential causes of dilaceration?
Damage during tooth development by trauma or apical infection of the preceding primary tooth
Impeded tooth development by a supernumerary, cyst or tumour
What medical condition results in multiple impacted teeth and multiple supernumerary teeth?
Cleidocranial dysplasia
What characteristic, non-craniofacial abnormality is associated with cleidocranial dysplasia?
Underdeveloped or hypoplastic clavicles
What dental developmental condition causes obliteration of the pulp chambers and sclerosis of the root canals?
Dentinogenesis imperfecta
What genetic condition is dentinogenesis imperfecta type I associated with?
Osteogenesis imperfecta
What are enamel pearls?
Well defined, rounded radiopacities located around the roots of the teeth
What are the clinical implications of enamel pearls?
Increased risk of periodontal disease by acting as plaque retentive factors
Complicated extraction of tooth
What genetic condition causes severe hypodontia and conical teeth?
Ectodermal dysplasia
