A high-quality impression is the foundation of a successful case. Whether for a submission or a revision, accurate impressions are vital to ensuring that treatment is effective and time-wasting delays are avoided.
We've listed our guidelines for a good impression below. Follow along and view an example of an excellent impression on our printable guide:
Detailed, accurate occlusal surfaces.
A clear impression of the occlusal surfaces ensures that the aligners will have a tight fit.
- Sharp cusps
- Tray doesn't show through impression
All gingival margins are defined and clear.
Defined gingival margins ensure enough retention points are present for effective tooth movements.
- Includes a minimum of 3-4mm of buccal and lingual surfaces outside gingival margin
Distal surfaces of molars are captured.
This is a common cause of missing retention points and fitting issues. If your patient has short clinical crowns, getting a clear impression of the molars is especially important.
- More than half of each terminal molar is visible in the impression
Impression material is intact.
Damaged or thin impression material compromise the accuracy of the molds and resulting aligners.
- No damage, warping, or separation of light and heavy material
No imperfections in the impression material.
Imperfections or double imprints in the impressions could affect the effectiveness of treatment with the resulting aligners.
- No bubbles, voids, thin walls, shifts, or double imprints