NDEB Pediatric Dentistry and Orthodontics 1 — Questions and Answers
Question 1: At what age do the permanent first molars typically erupt in children?
- 4–5 years
- 6–7 years (Correct answer)
- 8–9 years
- 10–11 years
Correct answer: 6–7 years
Permanent first molars typically erupt around age 6–7, earning them the name 'six-year molars.'
Question 2: Which behavior management technique involves telling a child what will happen before a procedure to reduce anxiety?
- Desensitization
- Tell-Show-Do (Correct answer)
- Positive reinforcement
- Voice control
Correct answer: Tell-Show-Do
Tell-Show-Do involves explaining (tell), demonstrating (show), then performing (do) a procedure to reduce pediatric patient anxiety.
Question 3: Which pulp therapy is indicated for a vital primary tooth with pulp exposure confined to the coronal pulp?
- Pulpectomy
- Pulpotomy (Correct answer)
- Direct pulp cap
- Indirect pulp cap
Correct answer: Pulpotomy
Pulpotomy removes the coronal pulp while preserving vital radicular pulp tissue in primary teeth.
Question 4: What is the primary cause of early childhood caries (ECC)?
- Fluoride deficiency
- Prolonged bottle feeding with sweetened liquids (Correct answer)
- Premature eruption of teeth
- Hereditary enamel hypoplasia
Correct answer: Prolonged bottle feeding with sweetened liquids
ECC is primarily caused by frequent, prolonged exposure of the teeth to fermentable carbohydrates, especially from bottle feeding with milk or juice.
Question 5: Which landmark is used to estimate the apex location for primary molar pulpectomy files?
- Root length on radiograph minus 1 mm (Correct answer)
- CEJ level
- Crown length divided by 2
- 2 mm past the radiographic apex
Correct answer: Root length on radiograph minus 1 mm
Working length for primary molar pulpectomy is estimated from the radiographic root length minus 1–2 mm to avoid periapical tissue damage.
Question 6: Which malocclusion class describes the mesiobuccal cusp of the upper first molar occluding anterior to the buccal groove of the lower first molar?
- Class I
- Class II (Correct answer)
- Class III
- Class IV
Correct answer: Class II
Angle Class II malocclusion is characterized by the upper first molar's mesiobuccal cusp sitting anterior to the lower first molar's buccal groove.
NDEB Pediatric Dentistry and Orthodontics 1
At what age do the permanent first molars typically erupt in children?