DDS Orthodontics and Pediatric Dentistry

Question 1

The leeway space (E-space) refers to the size difference between which groups of teeth?

Accepted Answer

Combined width of primary canine and molars minus combined width of permanent canine and premolars

Answer

Leeway space is the difference between the combined mesiodistal width of the primary C, D, E (canine and two molars) and their permanent successors (C, PM1, PM2) — approximately 1.5 mm per side in the mandible.

Question 2

The normal overjet (horizontal overlap) in a Class I occlusion is approximately:

Accepted Answer

2–4 mm

Answer

Normal overjet in a Class I occlusion ranges from 2–4 mm, representing the horizontal distance between the facial surface of the lower incisors and the lingual surface of the upper incisors.

Question 3

Fluoride varnish application in pediatric patients is recommended beginning at:

Accepted Answer

Eruption of the first primary tooth (approximately 6 months)

Answer

The American Academy of Pediatric Dentistry (AAPD) recommends fluoride varnish application beginning at the eruption of the first primary tooth, approximately 6 months of age.

Question 4

A child presents with a completely avulsed permanent incisor. The best immediate storage medium before replantation is:

Accepted Answer

Hank's Balanced Salt Solution (HBSS) or milk

Answer

HBSS (save-a-tooth solution) is the gold standard storage medium; milk is the best readily available alternative due to appropriate osmolarity and nutrients that maintain PDL cell viability.

Question 5

The primary treatment for early childhood caries (nursing bottle caries) is:

Accepted Answer

Elimination of the cariogenic feeding habit, diet counseling, and restorative treatment of affected teeth

Answer

ECC treatment requires stopping the cariogenic behavior (nocturnal bottle feeding with fermentable carbohydrates), parent education, diet modification, and prompt restorative/preventive dental care.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Orthodontics and Pediatric Dentistry