ABO Orthodontic Diagnosis and Treatment Planning 3

Question 1

The Wits appraisal is measured by projecting points A and B onto which plane?

Accepted Answer

Functional occlusal plane

Answer

Frankfort horizontal plane

Answer

Mandibular plane

Answer

Palatal plane

Question 2

Which of the following is a primary indication for extraction in orthodontic treatment planning?

Accepted Answer

Severe arch length deficiency with bimaxillary protrusion

Answer

Mild spacing

Answer

Class I with ideal overjet

Answer

Single missing lateral incisor with spacing

Question 3

A steep mandibular plane angle combined with a long lower facial height suggests which growth tendency?

Accepted Answer

Vertical (hyperdivergent)

Answer

Horizontal (hypodivergent)

Answer

Normodivergent

Answer

Transverse deficiency

Question 4

The curve of Spee is best described as:

Accepted Answer

The anteroposterior occlusal curvature seen in lateral view

Answer

The transverse curvature of the arches

Answer

The angulation of individual teeth

Answer

The midpalatal suture orientation

Question 5

In a growing Class II patient with a retrognathic mandible, which appliance approach is most appropriate?

Accepted Answer

Functional appliance to encourage mandibular advancement

Answer

Rapid palatal expander

Answer

Anterior bite plate only

Answer

Extraction of lower incisors

Question 6

A crossbite that shifts the mandible laterally on closure is classified as:

Accepted Answer

Functional (pseudo) crossbite

Answer

Dental crossbite with no shift

Answer

Skeletal crossbite only

Answer

Anterior open bite

Question 7

Which record is essential for evaluating the transverse dimension and posterior crossbite?

Accepted Answer

Frontal (PA) cephalogram or study models

Answer

Lateral cephalogram

Answer

Bitewing radiographs

Answer

Sialography