ABO Orthodontic Diagnosis and Treatment Planning 5

Question 1

Cervical vertebral maturation (CVM) staging on a cephalogram is used to assess:

Accepted Answer

Skeletal maturity and growth timing

Answer

CVM staging estimates skeletal maturity to time growth-modification treatment.

Question 2

In a patient with a transverse maxillary deficiency and bilateral posterior crossbite, the treatment of choice is often:

Accepted Answer

Maxillary expansion

Answer

Maxillary expansion corrects a narrow maxilla causing bilateral posterior crossbite.

Question 3

The interincisal angle is formed between the long axes of the:

Accepted Answer

Maxillary and mandibular incisors

Answer

The interincisal angle is measured between the long axes of the upper and lower incisors.

Question 4

A patient reports clicking and limited opening; treatment planning should include evaluation of:

Accepted Answer

Temporomandibular joint status before active mechanics

Answer

TMJ signs and symptoms must be assessed and stabilized before beginning orthodontic mechanics.

Question 5

Which of the following most increases the risk of external apical root resorption during treatment?

Accepted Answer

Prolonged heavy forces and long treatment duration

Answer

Heavy continuous forces and extended treatment time increase root resorption risk.

American Board of Orthodontics (ABO) Practice Test