DDS Orthodontics and Pediatric Dentistry 2

Question 1

Pulp therapy for a carious primary molar with a normal radiograph and no spontaneous pain, but mechanical pulp exposure, is best treated by:

Accepted Answer

Pulpotomy with mineral trioxide aggregate (MTA) or ferric sulfate

Answer

A pulpotomy removes the coronal pulp, which is inflamed from caries proximity, while preserving vital radicular pulp tissue; MTA or ferric sulfate are current evidence-based agents for primary tooth pulpotomy.

Question 2

The primary function of a space maintainer after premature loss of a primary second molar is to:

Accepted Answer

Prevent mesial drift of the permanent first molar into the extraction space

Answer

After loss of a primary second molar, the permanent first molar tends to drift mesially, reducing arch length needed for the permanent second premolar; a space maintainer prevents this migration.

Question 3

Molar-incisor hypomineralization (MIH) affects which teeth?

Accepted Answer

First permanent molars and permanent incisors

Answer

MIH is defined by demarcated qualitative enamel defects affecting one to four first permanent molars, frequently accompanied by affected permanent incisors.

Question 4

Rapid palatal expansion (RPE) is used to correct:

Accepted Answer

Bilateral posterior crossbite due to maxillary arch constriction

Answer

RPE applies transverse forces to open the midpalatal suture, widening the maxillary arch to correct bilateral posterior crossbites caused by maxillary skeletal constriction.

Question 5

Which type of tooth movement requires the most force in orthodontics?

Accepted Answer

Translation (bodily movement)

Answer

Bodily translation requires the entire tooth to move with the root and crown moving equally, demanding greater PDL stimulation area and more controlled force than simple tipping.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Orthodontics and Pediatric Dentistry 2