ABO ABO Dentofacial Orthopedics 2

Question 1

The Frankel appliance (function regulator) corrects Class II malocclusion primarily through:

Accepted Answer

Eliminating abnormal lip and cheek muscle pressure, allowing the dental arches to develop

Answer

Applying direct forces to the teeth

Answer

Advancing the mandible with an inclined plane

Answer

Using extraoral forces

Question 2

Which cephalometric measure is most commonly used to quantify the degree of mandibular advancement achieved by functional appliance therapy?

Accepted Answer

SNB angle

Answer

SNA angle

Answer

ANB angle

Answer

Y-axis angle

Question 3

Orthopedic treatment of a Class II skeletal patient is most effective when initiated:

Accepted Answer

During the pubertal growth spurt (peak growth velocity)

Answer

In the primary dentition

Answer

After all permanent teeth have erupted

Answer

Only in adult patients

Question 4

Slow maxillary expansion using a removable appliance achieves expansion primarily through:

Accepted Answer

Dentoalveolar tipping of the posterior teeth

Answer

Suture opening at the midpalatal suture

Answer

Direct bone apposition on the buccal cortex

Answer

Intrusion of posterior teeth

Question 5

The Andresen activator corrects Class II malocclusion by:

Accepted Answer

Advancing and posturing the mandible forward during sleep

Answer

Applying direct retraction force to the upper incisors

Answer

Using a spring mechanism to tip the lower molars forward

Answer

Retracting the maxilla with labial bows

Question 6

Cervical vertebral maturation (CVM) stage CS3 indicates:

Accepted Answer

The peak of the pubertal growth spurt

Answer

Pre-adolescent growth; no pubertal peak yet

Answer

Approximately 1 year before the pubertal growth peak

Answer

Post-pubertal; growth is nearly complete