The ornamental design for a dental implant, as shown and described.
FIG. 1 is a perspective view of a dental implant of the present invention;
FIG. 2 is a right side view of the dental implant shown in FIG. 1;
FIG. 3 is a front plan view of the dental implant shown in FIG. 1;
FIG. 4 is a bottom view of the dental implant shown in FIG. 1;
FIG. 5 is a left side view of the dental implant shown in FIG. 1;
FIG. 6 is a rear plan view of the dental implant shown in FIG. 1; and,
FIG. 7 is a top view of the dental implant shown in FIG. 1.
The broken lines immediately adjacent the claimed areas represent the bounds of the claim, and all other broken lines are included for the purpose of illustrating portions of the dental implant that form no part of the claimed design.