In what scenario would an orthodontic positioner be used?

An orthodontic positioner is designed specifically to help maintain the position of teeth after orthodontic treatment, particularly after braces have been removed. It is an appliance that fits over the teeth, aiding in the retention phase to ensure that the teeth do not shift back to their original positions. This phase is crucial for achieving the desired orthodontic results and promoting stability in the dental arch.

The use of orthodontic positioners is essential because after the active orthodontic treatment has been completed, teeth are still somewhat mobile and may relapse if not properly supported. The positioner helps in fine-tuning the alignment and occlusion while providing a gentle but consistent pressure to keep the teeth in their new positions.

The other options refer to various stages of orthodontic treatment where other tools play a role, such as bracket placement, initial adjustments, or cleaning, but they do not align with the specific purpose of an orthodontic positioner. Hence, the scenario of using an orthodontic positioner after braces are removed for retention is the most accurate.