What major advantage does a perforated tray provide during dental impressions?

The major advantage of a perforated tray is the improved retention of the impression material. The perforations create mechanical interlocks between the tray and the impression material, allowing for better adhesion. This feature ensures that the impression material does not easily separate from the tray during the impression process, which is critical for achieving accurate and detailed impressions. A secure fit between the tray and the material enables the material to capture the contours and details of the dental structures more effectively, leading to a more satisfactory outcome for the dental procedure.

While handling, cost, and material usage are significant considerations, they do not directly enhance the core function of capturing an accurate impression. Therefore, the perforated design's primary advantage lies in its ability to provide superior retention, which is essential for successful impression taking in dentistry.