The ornamental design for a dentalmillingmachine, as shown and described.
FIG. 1 is a front view of a dental milling machine;
FIG. 2 is a left view thereof;
FIG. 3 is a front perspective view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a rear perspective view thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the dental milling machine and form no part of the claimed design.