ABO (Reading) 5

Question 1

Reading an occlusal cant on a frontal cephalogram or photograph, this finding most often relates to which type of asymmetry?

Accepted Answer

Transverse/vertical facial asymmetry

Answer

An occlusal cant reflects vertical-transverse facial asymmetry between the two sides.

Question 2

In the ABO CR-Eval, the 'occlusal relationships' criterion deducts points for what?

Accepted Answer

Class discrepancies in molar/canine/premolar intercuspation

Answer

Point deductions occur when posterior teeth do not achieve proper Class I intercuspation.

Question 3

When reading a cephalometric superimposition on the anterior cranial base (SN), the clinician evaluates what?

Accepted Answer

Overall facial growth and treatment changes

Answer

SN superimposition reveals overall growth changes and the net effect of treatment over time.

Question 4

A radiograph shows a tooth with an inverted crown positioned high in the maxilla; this ectopic finding is termed what?

Accepted Answer

Impaction with inversion

Answer

An unerupted, inverted tooth high in the jaw is an inverted impaction.

Question 5

In reading the interincisal angle on a cephalogram, a decreased (more acute) angle usually indicates what?

Accepted Answer

Proclined/protrusive incisors

Answer

A smaller interincisal angle corresponds to proclined, protrusive upper and lower incisors.

American Board of Orthodontics (ABO) Practice Test