The ornamental design for a dentalinstrument mount for prophy paste containers, as shown and described.
FIG. 1 is an enlarged upper perspective view of a dental instrument mount for prophy paste containers having two overlying receptacles to receive a conventional cylindrical prophy paste container and an elongated rectangular prophy paste container, the lower portion thereof being adapted to sit on a flat surface or to be held between the fingers of a dental professional;
FIG. 2 is a first side elevational view of the dental instrument mount shown in FIG. 1;
FIG. 3 is a second side elevational view thereof;
FIG. 4 a third side elevational view of the dental instrument mount shown in FIG. 2;
FIG. 5 a fourth side elevational view of the dental instrument mount shown in FIG. 3;