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The ornamental design for an orthodontic spring, as shown and described.
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FIG. 1 is a front perspective view of an orthodontic spring showing my new design.
FIG. 2 is front elevational view thereof.
FIG. 3 is a right side elevational view thereof.
FIG. 4 is a rear elevational view thereof.
FIG. 5 is a left side elevational view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
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