The ornamental design for a hand operated dentalinstrument, as shown and described.
FIG. 1 is a perspective view of the hand operated dental instrument;
FIG. 2 is a front view of the hand operated dental instrument;
FIG. 3 is a rear view of the hand operated dental instrument;
FIG. 4 is a left side view of the hand operated dental instrument;
FIG. 5 is a right side view of the hand operated dental instrument;
FIG. 6 is a top view of the hand operated dental instrument; and,
FIG. 7 is a bottom view of the hand operated dental instrument.
The broken line showing in the drawings is included for the purpose of illustrating portions of the hand operated dental instrument and forms no part of the claimed design.