When would it be necessary to use adhesive in an impression tray?

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Using adhesive in an impression tray is particularly important when the tray is not perforated. The primary purpose of the adhesive is to create a bond between the impression material and the tray, preventing the material from separating during the impression-taking process. In non-perforated trays, there are no holes for the material to grip onto, which can result in the impression material moving or pulling away from the tray when you are using it.

When a tray is perforated, the holes allow for better mechanical retention of the impression material, negating the need for adhesive to some extent. In circumstances where a large volume of material is required, or when using a convex tray, while certain considerations related to tray design might be addressed, adhesive is fundamentally necessary when the tray lacks any perforations to secure the impression material effectively.

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