Developmental abnormalities

Question 1

what is microdontia?

Answer 1

when the teeth are very small (upper laterals and 8s)

Question 2

what is macrodontia?

Answer 2

when the teeth are really large (incisors and canines)

Question 3

what is the difference between fusion and gemination?

Answer 3

fusion is 2 individually formed teeth joined together where as gemination is a single root with 2 crowns

Question 4

what would you expect to see with concrescence?

Answer 4

when roots become joined together by cementum only

Question 5

what is Dilaceration?

Answer 5

an abnormal bend in the root of a tooth

Question 6

what is Odontomes?

Answer 6

irregular teeth, unusual shape, often do not erupt.

Question 7

what is an enamel pearl?

Answer 7

nodules of enamel with a core of dentine

Question 8

can you describe what you would see on a radiograph if a tooth had dilacerations?

Answer 8

twisted root or crown on a tooth

Question 9

what is the difference between dens en dente and dens evaginatus?

Answer 9

dens en dente is when there’s a tooth within a tooth where as dens evaginatus is when the pulp horn extends into a core of dentine on the occlusal surface of a first or second premolar

Question 10

what is amelogenesis imperfecta?

Answer 10

Hereditary disorder affecting the enamel Partial or complete lack of enamel
Yellow or brown rough crowns
Susceptible to decay
Very difficult to keep clean due to roughness and sensitivity

Question 11

what is dentinogenesis imperfect?

Answer 11

hereditary disorder May occur alone or with with skeletal condition, ‘osteogenesis imperfecta’
May occur alone or in conjunction with skeletal condition, ‘osteogenesis imperfecta’ the enamel
is poorly supported by defective dentine and can flake away, grey/blue appearance
Pulp death commonly occurs

Question 12

what is fluorosis and what would it look like in the mouth?

Answer 12

Caused by increased concentration of fluorideAffects those teeth in amelogenisis at the time of fluoride toxicity
Defects range from white flecks to opacities throughout enamel depending on mild or severe fluorosis severe fluorosis brown staining.

Question 13

what teeth are most commonly affected by anodontia or hypodontia?

Answer 13

Partial anodontia/hypodontia - 8’s, 5’s and 2’s – (take care when being asked to extract primary dentition – radiographs).

Question 14

how would you manage abnormalities of the dentition?

Answer 14

Treatment of sensitivity
Oral hygiene
cosmetic treatment
anterior composites
extractions