ABO Orthodontic Diagnosis and Treatment Planning 4

Question 1

The SNA angle primarily indicates the anteroposterior position of which structure?

Accepted Answer

Maxilla relative to cranial base

Answer

Mandible relative to cranial base

Answer

Occlusal plane inclination

Answer

Condylar head position

Question 2

A patient with a concave profile, protrusive lower lip, and negative overjet most likely has:

Accepted Answer

Skeletal Class III

Answer

Skeletal Class I

Answer

Skeletal Class II

Answer

Bimaxillary protrusion

Question 3

During treatment planning, the term 'anchorage' refers to:

Accepted Answer

Resistance to unwanted tooth movement

Answer

The amount of crowding present

Answer

Vertical facial height

Answer

The retention phase duration

Question 4

Which finding would most strongly favor a surgical rather than orthodontic-only approach in an adult?

Accepted Answer

Severe skeletal discrepancy beyond dental compensation

Answer

Mild dental crowding

Answer

Minor rotations

Answer

Single spacing between incisors

Question 5

The mixed dentition analysis is used to predict:

Accepted Answer

Size of unerupted permanent canines and premolars

Answer

Adult skeletal growth direction

Answer

Airway dimension

Answer

Condylar path

Question 6

A deep overbite with excessive curve of Spee is typically corrected by:

Accepted Answer

Extruding posterior teeth or intruding incisors to level the arch

Answer

Rapid maxillary expansion

Answer

Distalizing molars only

Answer

Interproximal reduction of molars

Question 7

Which soft tissue analysis relates the lips to a line from the nose tip to the chin?

Accepted Answer

Steiner S-line / Ricketts E-line

Answer

Bolton ratio

Answer

Wits appraisal

Answer

Jarabak ratio