NDEB Pediatric Dentistry and Orthodontics 2

Question 1

What space maintainer is typically used after premature loss of a mandibular second primary molar before the permanent first molar erupts?

Accepted Answer

Distal shoe appliance

Answer

The distal shoe appliance guides eruption of the unerupted permanent first molar when the second primary molar is lost early.

Question 2

Which sealant placement step is most critical for long-term retention?

Accepted Answer

Adequate acid etching and isolation

Answer

Thorough acid etching and strict moisture control are the most critical factors for sealant retention and effectiveness.

Question 3

Which cephalometric landmark is located at the most anterior point of the mandibular symphysis?

Accepted Answer

Pogonion

Answer

Pogonion (Pog) is defined as the most anterior point on the bony chin in the midsagittal plane.

Question 4

Thumb sucking that persists beyond which age is most likely to cause permanent dental changes?

Accepted Answer

6 years

Answer

Thumb sucking persisting past age 6, when permanent teeth begin erupting, is associated with lasting anterior open bite and proclination.

Question 5

Which stainless steel crown preparation requirement differentiates it from conventional crown prep?

Accepted Answer

Circumferential subgingival reduction of approximately 1 mm

Answer

SSC preparation requires circumferential subgingival reduction of about 1 mm to allow the crown margin to seat below the gingival crest.

NDEB - National Dental Examining Board Practice Test