ABO (Reading) 4

Question 1

In the ABO Scenario-Based Component, candidates read a clinical vignette and must primarily demonstrate which competency?

Accepted Answer

Diagnosis and treatment decision-making

Answer

The scenario-based exam assesses diagnostic reasoning and appropriate treatment decision-making.

Question 2

Reading a hand-wrist radiograph for skeletal maturity, ossification of the adductor sesamoid of the thumb signals what?

Accepted Answer

Onset of the pubertal growth spurt

Answer

Appearance of the adductor sesamoid indicates the pubertal growth spurt is beginning or near.

Question 3

The cervical vertebral maturation (CVM) method reads changes in which vertebrae to estimate skeletal age?

Accepted Answer

C2, C3, and C4

Answer

CVM staging is based on the shape and concavity changes of the C2, C3, and C4 bodies.

Question 4

In ABO finished-case evaluation, 'root angulation' is best assessed from which record?

Accepted Answer

Panoramic radiograph

Answer

Root parallelism and angulation are evaluated primarily from the panoramic radiograph.

Question 5

When reading a lateral cephalogram, the nasolabial angle is used to evaluate what?

Accepted Answer

Upper incisor inclination and lip support

Answer

The nasolabial angle helps assess upper incisor position and its effect on upper lip support.

American Board of Orthodontics (ABO) Practice Test