OD21

Question 1

What is the term for being born with no teeth in your life?

Answer 1

Anodontia

Question 2

What are the 3 most common teeth to be missing in hypodontia?

Answer 2

1. 8’s
2. Upper 2’s
3. Lower 5’s

Question 3

2 genes involved in hypodontia?

Answer 3

PAX9

MSX1

Question 4

General features of Hypohidrotic ectodermal dysplasia?

Answer 4

Smooth dry skin with sparse hair
Partial / total absence of sweat glands
Nail abnormalities

Question 5

Dental features of Hypohidrotic ectodermal dysplasia?

Answer 5

Anodontia / hypodontia
Delayed eruption
Deformed teeth
Conical crowns

Question 6

General features of Cleidocranial dysplasia?

Answer 6

Absent / hypoplastic clavicles

Fontanelles and sutures persist

Question 7

Dental features of Cleidocranial dysplasia?

Answer 7

Deciduous teeth retained
Supernumerary teeth
Delayed / failure of eruption

Question 8

General and dental features of Ehlers Danlos Syndrome?

Answer 8

Inherited defect of collagen
Hypermobile joints
Hyperextensibility of skin
Dental abnormalities
Microdontia
Short roots
Pulp stones
Fragile mucosa
Juvenile periodontitis

Question 9

What is the difference between fusion and gemination?

Answer 9

Fusion- The union between dentine and/or enamel of two or more separate teeth

Gemination- The partial development of two teeth from a single tooth bud following incomplete division

Question 10

What is concrescence?

Answer 10

The roots of two or more teeth are united by cementum alone after formation of the crowns

Question 11

What is Taurodontism?

Answer 11

The pulp chamber has a greater apico-occlusal height than normal and no cervical constriction aka LONG PULP

Question 12

What happens if you’re exposed to excess fluoride?

Answer 12

Hypoplastic / hypomineralised enamel

White flecks / patches / striations
Yellow / brown / black discolouration