ABO ABO Dentofacial Orthopedics

Question 1

The rapid palatal expander (RPE) creates a midpalatal suture opening. At what age does this suture typically become interdigitated and difficult to expand non-surgically?

Accepted Answer

After 16–17 years of age

Answer

8–10 years

Answer

10–12 years

Answer

14–16 years

Question 2

A cervical-pull headgear applies force in which direction relative to the maxilla?

Accepted Answer

Inferiorly and posteriorly

Answer

Superiorly and posteriorly

Answer

Directly posteriorly only

Answer

Anteriorly and superiorly

Question 3

Which functional appliance is a one-piece, tooth-borne, mandibular advancement device that requires bilateral simultaneous engagement?

Accepted Answer

Twin Block appliance

Answer

Bionator

Answer

Activator

Answer

Frankel appliance

Question 4

Protraction facemask therapy is indicated for which skeletal problem?

Accepted Answer

Skeletal Class III due to maxillary deficiency

Answer

Skeletal Class II due to mandibular retrusion

Answer

Vertical excess of the maxilla

Answer

Transverse maxillary deficiency

Question 5

Bone-anchored maxillary protraction uses mini-implants instead of tooth anchorage primarily to:

Accepted Answer

Avoid dentoalveolar side effects like incisor proclination

Answer

Reduce treatment time

Answer

Enable treatment in adults

Answer

Decrease patient discomfort

Question 6

During rapid palatal expansion (RPE), a midline diastema typically appears and then closes spontaneously because:

Accepted Answer

Suture opening pushes incisors apart and roots uprighting closes the diastema

Answer

The teeth drift apart permanently

Answer

The frenulum is always cut during RPE

Answer

Bone fills in between the upper central incisors