For taking a mandibular impression, which tray is used?

The correct choice for taking a mandibular impression is the lower impression tray. This specific tray is designed to fit the shape and contours of the lower arch of the mouth, ensuring accurate capture of the soft and hard tissues in the mandibular area.

Using a lower impression tray allows for a proper fit that can comfortably hold the impression material while ensuring that all necessary details are captured. This is crucial for creating accurate casts or models for procedures such as dentures or orthodontics.

The upper impression tray, in contrast, is specifically shaped for the upper arch, making it unsuitable for capturing impressions of the lower jaw. Other options, like anteriors or quadrant impression trays, may focus on specific regions or sections of the dental arch but do not provide the comprehensive coverage needed for a full mandibular impression.