Primary Dentition

Question 1

When are the maxillary teeth formed

Answer 1

4, 4.5, 5, 5, 6 months in utero

Question 2

When do maxillary baby teeth erupt

Answer 2

7.5, 9, 18, 14, 24 months

Question 3

What do baby mandibular teeth form

Answer 3

4.5, 4.5, 5, 5, 6

Question 4

When do mandibular baby teeth erupt

Answer 4

6, 7, 16, 12, 20 (about 2 months before corresponding maxillary)

Question 5

Teeth with green and blue staining

Answer 5

Neonatal hyperbilirubinemia. Liver problems result in bilirubin being incorporated into teeth

Question 6

Opalescent teeth. Orangey.

Answer 6

Dentinogenesis. Teeth are soft, worn down until completely gone

Question 7

Recommended water fluoridation

Answer 7

0.7-1ppm. Over 8ppm, severe fluoridation

Question 8

Singapore’s water fluoridation

Answer 8

0.4-0.6ppm

Question 9

Delayed eruption causes

Answer 9

Systemic factors: endocrine disorders, cleidocranial dysplasia

Local factors: supernumeraries, odontome (benign tumour), ectopic positioning

Question 10

Premature exfoliation causes

Answer 10

Trauma and caries cause pathological root resorption.

Ectopic eruption of permanent successor.

Trauma and severe infection.