How can the shape of a standard perforated tray used with alginate impression materials be modified to better fit individual contours?

Explanation

The standard perforated tray for alginate impressions can be customized to fit the patient's anatomy more precisely by adding utility wax along the tray's edges. This wax helps adapt the tray to unique contours, ensuring a better impression. Other wax types like base plate, beading, and boxing wax serve different purposes and are not typically used for this modification.