What is a key characteristic of a nonperforated impression tray?

A nonperforated impression tray is designed without any holes, serving an important function in the dental impression process. The key characteristic of this type of tray is that it does not allow for material to escape. This design helps to create a more accurate impression, as it keeps the impression material contained and firmly in place during the impression-taking process. The smooth surface of nonperforated trays can effectively hold the material, which is essential for capturing the necessary details of the dental anatomy.

In terms of other options, perforated trays are generally preferred in many cases for their ability to enhance retention through holes that allow the impression material to mechanically bond with the tray. Limiting the use of nonperforated trays to maxillary impressions is inaccurate, as they can be used for both maxillary and mandibular impressions. Lastly, nonperforated trays do not inherently provide less patient comfort compared to perforated ones; comfort often depends more on tray design and material than the presence or absence of perforations.