dental abnormalities

Question 1

What is a supernumerary tooth?

Answer 1

A tooth that is an addition to the normal dentition

Question 2

What is a supplemental tooth?

Answer 2

A supernumerary with the same morphology as a normal tooth

Question 3

What is the word for a tooth that is smaller than normal?

Answer 3

Microdont

Question 4

What is another word for a supernumerary distal to the dentition?

Answer 4

Distodens

Question 5

What age would you expect to see third molars start to calcify and therefore appear on radiographs?

Answer 5

8-10

Question 6

What is dens in dente?

Answer 6

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

Question 7

What are the risks of leaving an ectopic canine in situ?

Answer 7

External root resorption of the adjacent teeth
Dentigerous cyst formation

Question 8

What is the word for an upside down tooth?

Answer 8

Inverted

Question 9

What is the word to describe teeth that are switched in position?

Answer 9

Transposed

Question 10

What is gemination?

Answer 10

The development of 2 conjoined teeth from a single tooth bud

Question 11

What is fusion?

Answer 11

The joining of 2 tooth buds resulting in 2 conjoined teeth

Question 12

What is taurodontism?

Answer 12

Elongation of the body of the tooth and apical displacement of the pulpal floor resulting in a vertically elongated pulp chamber and root canal

Question 13

Which procedures can be complicated by taurodontism and why?

Answer 13

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

Question 14

What dental issues are associated with amelogenesis imperfecta?

Answer 14

Aesthetic concerns
Dentine hypersensitivity
Increased caries
Increased tooth wear

Question 15

What are potential causes of dilaceration?

Answer 15

Damage during tooth development by trauma or apical infection of the preceding primary tooth
Impeded tooth development by a supernumerary, cyst or tumour

Question 16

What medical condition results in multiple impacted teeth and multiple supernumerary teeth?

Answer 16

Cleidocranial dysplasia

Question 17

What characteristic, non-craniofacial abnormality is associated with cleidocranial dysplasia?

Answer 17

Underdeveloped or hypoplastic clavicles

Question 18

What dental developmental condition causes obliteration of the pulp chambers and sclerosis of the root canals?

Answer 18

Dentinogenesis imperfecta

Question 19

What genetic condition is dentinogenesis imperfecta type I associated with?

Answer 19

Osteogenesis imperfecta

Question 20

What are enamel pearls?

Answer 20

Well defined, rounded radiopacities located around the roots of the teeth

Question 21

What are the clinical implications of enamel pearls?

Answer 21

Increased risk of periodontal disease by acting as plaque retentive factors
Complicated extraction of tooth

Question 22

What genetic condition causes severe hypodontia and conical teeth?

Answer 22

Ectodermal dysplasia