NDEB Pediatric Dentistry and Orthodontics 2 — Questions and Answers
Question 1: What space maintainer is typically used after premature loss of a mandibular second primary molar before the permanent first molar erupts?
- Nance appliance
- Distal shoe appliance (Correct answer)
- Band-and-loop maintainer
- Lingual arch
Correct answer: Distal shoe appliance
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?
- Choosing a light-cured material
- Adequate acid etching and isolation (Correct answer)
- Using a high-viscosity sealant
- Finishing with a bur
Correct answer: Adequate acid etching and isolation
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?
- Gnathion
- Menton
- Pogonion (Correct answer)
- B-point
Correct answer: Pogonion
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?
- 2 years
- 4 years
- 6 years (Correct answer)
- 8 years
Correct answer: 6 years
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?
- Beveled margins
- Minimal occlusal reduction
- 360-degree shoulder
- Circumferential subgingival reduction of approximately 1 mm (Correct answer)
Correct answer: Circumferential subgingival reduction of approximately 1 mm
SSC preparation requires circumferential subgingival reduction of about 1 mm to allow the crown margin to seat below the gingival crest.
Question 6: What is the most common supernumerary tooth found in the permanent dentition?
- Paramolar
- Distomolar
- Mesiodens (Correct answer)
- Peridens
Correct answer: Mesiodens
The mesiodens is the most common supernumerary tooth, located in the midline of the maxillary anterior region.
NDEB Pediatric Dentistry and Orthodontics 2
What space maintainer is typically used after premature loss of a mandibular second primary molar before the permanent first molar erupts?