ABO ABO Retention and Stability 2

Question 1

Bonded retainers should be checked at recall visits primarily for:

Accepted Answer

Bond failures, wire distortion, and signs of plaque accumulation

Answer

Changes in wire gauge

Answer

Changes in bracket color

Answer

Evidence of root resorption

Question 2

Essix (vacuum-formed) retainers are contraindicated in patients who:

Accepted Answer

Exhibit bruxism or severe parafunction

Answer

Have all permanent teeth erupted

Answer

Are in the early permanent dentition

Answer

Have had premolar extractions

Question 3

Long-term stability of corrected Class III malocclusion treated with growth modification is LEAST favorable in patients with:

Accepted Answer

Vertical mandibular growth pattern and strong Class III genetics

Answer

Mild skeletal discrepancy

Answer

Horizontal mandibular growth pattern

Answer

Early treatment start

Question 4

The primary purpose of a positioner appliance at the end of fixed treatment is to:

Accepted Answer

Seat and refine the occlusion while providing initial retention

Answer

Initiate space closure

Answer

Expand the dental arches

Answer

Correct anterior open bite

Question 5

According to the ABO grading system, which OGS (Objective Grading System) criterion evaluates the axial inclination of posterior teeth?

Accepted Answer

Root angulation

Answer

Marginal ridges

Answer

Buccolingual inclination

Answer

Overjet

Question 6

Retention protocol for a patient treated for a severe anterior open bite should ideally include:

Accepted Answer

Long-term or indefinite retention, often with a fixed retainer

Answer

No retainer since open bites are stable

Answer

Short-term Hawley retainer only

Answer

Removal of retainer after 6 months