In backtracking the patient is required to wear the previous aligners for a longer period than originally planned. If the teeth have gone off track, this gives them additional time in a previous aligner to move into the anticipated position.
Backtracking may be needed for the following;
- Non-compliant patient, patient failed to wear the aligners for least 22 hours per day
- An incisal gap
- Inadequate tooth movements
- Cases with tracking issues