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

The Frankel appliance uses vestibular shields to remove lip and cheek pressure, providing an environment for unrestricted arch development.

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

The SNB angle measures the anteroposterior position of the mandible relative to the anterior cranial base, so an increase indicates mandibular advancement.

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

Functional appliance therapy achieves the greatest skeletal effect when timed with the pubertal growth spurt because condylar growth potential is maximal.

Question 4

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

Accepted Answer

Dentoalveolar tipping of the posterior teeth

Answer

Removable slow expanders produce mainly dentoalveolar buccal tipping of the upper posterior teeth rather than true sutural opening.

Question 5

The Andresen activator corrects Class II malocclusion by:

Accepted Answer

Advancing and posturing the mandible forward during sleep

Answer

The Andresen activator holds the mandible in a protruded position during sleep, directing condylar growth and restricting maxillary forward displacement.

American Board of Orthodontics (ABO) Practice Test

American Board of Orthodontics (ABO) Practice Test

ABO ABO Dentofacial Orthopedics 2