The ornamental design for a dental implant, as shown and described.
FIG. 1 is a first perspective view of a dental implant;
FIG. 2 is a second perspective view of the dental implant of FIG. 1;
FIG. 3 is a rear elevational view of the dental implant of FIG. 1;
FIG. 4 is a front elevational view of the dental implant of FIG. 1;
FIG. 5 is a top plan view of the dental implant of FIG. 1;
FIG. 6 is a bottom plan view of the dental implant of FIG. 1;
FIG. 7 is a left side view of the dental implant of FIG. 1; and,
FIG. 8 is a right side view of the dental implant of FIG. 1.
It is contemplated that any portion of one or more of the solid lines shown in any one or more of the Figures can be converted into evenly broken lines to form no part of a claimed invention.