The ornamental design for a dental screwdriver, as shown and described.
FIG. 1 is a forward perspective view of a forth embodiment of a dental screw driver of the present invention;
FIG. 2 is a rearward perspective view of the dental screw driver shown in FIG. 1;
FIG. 3 is a front plan view of the dental screw driver shown in FIG. 1;
FIG. 4 is a rear plan view of the dental screw driver shown in FIG. 1;
FIG. 5 is a right side view of the dental screw driver shown in FIG. 1, the left side view being a mirror view of the right side;
FIG. 6 is a top plan view of the dental screw driver shown in FIG. 1; and,
FIG. 7 is a bottom plan view of the dental screw driver 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 screw driver that form no part of the claimed design. None of the broken lines form part of the claimed design.