I claim, the ornamental design for a dental implant, as shown and described herein.
FIG. 1, shows a front right perspective view the dental implant embodying our new design;
FIG. 2, shows a front perspective view thereof;
FIG. 3, shows a bottom right perspective view thereof;
FIG. 4, shows a front elevational view thereof;
FIG. 5, shows a rear elevational view thereof;
FIG. 6, shows a top plan view thereof; and,
FIG. 7, shows a bottom plan view thereof.
The break lines shown in FIGS. 1, and 3-5, form no part of the claimed design except for indicating indeterminate length. The absence of such break lines in other Figures, shall not indicate a dimensional restriction; rather, relative length of all aspects of the dental implant is indeterminate.