ABO (Reading) 3

Question 1

When reading a panoramic radiograph, ectopic eruption of the maxillary canine is most often associated with which adjacent tooth resorption risk?

Accepted Answer

Lateral incisor roots

Answer

Palatally displaced canines commonly cause resorption of the lateral incisor roots.

Question 2

In ABO case documentation, the term 'interproximal contacts' in the CR-Eval scores what aspect of the finished dentition?

Accepted Answer

Absence of open spaces between adjacent teeth

Answer

The interproximal contacts criterion checks that no open spaces remain between adjacent teeth.

Question 3

Which Angle classification describes a molar relationship where the mandibular first molar is mesial to the Class I position?

Accepted Answer

Class III

Answer

A mesially positioned mandibular molar relative to Class I indicates a Class III molar relationship.

Question 4

Reading a cephalogram, an increased SN-mandibular plane angle typically indicates which facial growth pattern?

Accepted Answer

Hyperdivergent (vertical) growth

Answer

A steep (increased) mandibular plane angle reflects a hyperdivergent, vertical growth pattern.

Question 5

In the ABO Discrepancy Index, which factor adds points for the anteroposterior discrepancy of the occlusion?

Accepted Answer

Cephalometric ANB and other AP measures

Answer

Cephalometric measures such as ANB contribute points to the AP component of the Discrepancy Index.

American Board of Orthodontics (ABO) Practice Test