The ornamental design for a controlunit for dentalhandpiece, as shown and described.
FIG. 1 is a front view of a control unit for dental handpiece;
FIG. 2 is a rear view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a perspective view thereof from upper right side thereof.
The broken lines are included for the purpose of illustrating portions of the control unit for dental handpiece that form no part of the claimed design.
The left side view is omitted since it is represented symmetrically to the right side view.