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The ornamental design for an orthodontic appliance, as shown and described. |
FIG. 1 is a perspective view of an orthodontic appliance showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a left side elevational view thereof, the right side being a mirror image;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof;
FIG. 7 is a perspective view of a second embodiment thereof;
FIG. 8 is a top plan view thereof;
FIG. 9 is a bottom plan view thereof;
FIG. 10 is a left side elevational view thereof, the right side being a mirror image;
FIG. 11 is a front elevational view thereof; and
FIG. 12 is a rear elevational view thereof.
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