Developmental Abnormalities of Teeth

Question 1

What teeth are tyipcally absent in partial anodontia (first four in order)

Answer 1

• Third molars
• Maxillary lateral incisors
• Mandibular premolars
• Maxillary premolars

Question 2

Developmental disorder characterised by anodontia. Affects teeth, sweat glands, sebacious glands, nails, hair

Answer 2

Ectodermal dysplasia

Question 3

2 syndromes associated with supernumarary

Answer 3

• Cleidocranial dysplasia
• Gardners syndrome

Question 4

Most common site for supernumaray and what is it called:

Answer 4

Between maxillary centrals - mesiodens

Question 5

Fusion of cementum of two or more teeth following root formation is called:

Answer 5

Concrescence

Question 6

Joining of two or more tooth germs is called;

Answer 6

fusion

Question 7

Partial division of the tooth bud resulting in two crowns and one root is called:

Answer 7

Germination

Question 8

Abnormal bend in the root or crown of tooth

Answer 8

Dilaceration.

Result of trauma during formation - environmental AND genetic factors

Question 9

Invagination of the enamel organ, resulting in potential communication with the pulp

Answer 9

• Dens in dente

Question 10

Spherical mass of enamel on the occlusal surface of the tooth, which contains pulp tissue:

Answer 10

Dens evaginatus

Question 11

Small spherical mass near bifurcation of tooth. May contain pulp tissue.

Answer 11

Enamel pearl

Question 13

If teeth have thin enamel and are a yellow brown colour they are likely:

a) hypoplastic
b) hypomineralised

Answer 13

a) hypoplastic

Question 14

If teeth are normal size and shape but the surface enamel is chalky and easily worn/fractured they are likely:

a) hypoplastic
b) hypomineralized

Answer 14

b) hypomineralised