Which statement is true regarding the preparation of a custom tray for elastomeric impressions?

In the context of preparing a custom tray for elastomeric impressions, using adhesive is indeed the preferred method for ensuring retention of the impression material. Adhesive creates a strong bond between the tray and the impression material, which is essential for achieving an accurate and stable impression. This option highlights the importance of a solid connection that adhesive provides, helping to prevent any displacement during the impression-taking process.

While perforations can also help in some situations by allowing the impression material to flow into the tray, they are not always necessary and may not provide the same level of retention as adhesive, especially with certain types of elastomeric materials. The timing of adhesive application is also crucial; for optimal effectiveness, it should be applied prior to the impression-taking process, allowing it to adequately bond when the impression material is placed. The consideration of where to make perforations is another critical aspect, as they should not interfere with the area over the prepared tooth to avoid compromising the impression quality and detail.

Hence, the preference for adhesive in this context is based on its reliability in providing superior retention compared to the alternative options.