The ornamental design for a dentalimpressiontray, as shown and described.
FIG. 1 is a top right side perspective view of the present design: a dental impression tray.
FIG. 2 is a bottom right side perspective view thereof.
FIG. 3 is an enlarged top plan view thereof.
FIG. 4 is an enlarged bottom plan view thereof.
FIG. 5 is a left side elevational view thereof.
FIG. 6 is a right side elevational view thereof.
FIG. 7 is a rear side elevational view thereof; and,
FIG. 8 is a front side elevational view thereof.
The right side and left side of the dental impression tray are mirror images. The broken lines shown in the figures depict portions of the dental impression tray that form no part of the claimed design.