For information regarding good impressions, refer to the following:

• Overview
• Detailed, accurate occlusal surfaces
• All gingival margins are defined and clear
• Distal surfaces of molars are captured
• Impression material is intact
• No imperfections in the impression material

Overview

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:

A good impression looks like this:

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