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The ornamental design for a double tooth implant substructure, as shown and described.
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FIG. 1 is a perspective view of a double tooth implant substructure.
FIG. 2 is a front elevational view of the invention.
FIG. 3 is a right side elevational view of the invention.
FIG. 4 is a left side elevational view of the invention.
FIG. 5 is a top plan view of the invention.
FIG. 6 is a bottom plan view of the invention.
FIG. 7 is a rear elevational view of the invention; and,
FIG. 8 is a sectional, side elevational view of the invention taken along line 8--8 in FIG. 7.
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