Fitting issues can occasionally occur during treatment. There are a few possible causes for fitting problems:
- If the first step doesn't fit, the most likely cause is an inaccurate 3D model. This can be caused by distortions in the initial impressions or scans.
- If the fit of the aligners gets worse over time, the teeth may not be "tracking"—in other words, the aligners are progressing as originally planned in the treatment setup, but the actual teeth aren't keeping up due to lack of space or insufficient pressure.
- In rare circumstances, an aligner may be distorted due to physical damage or a manufacturing defect.
Some common types of fitting issues are listed below. Click on the link for detailed troubleshooting information.