Interdental Laterally Expansive Wedge

An interdental laterally expansive wedge for insertion between adjacent teeth during approximal cavity preparation and finishing, said interdental laterally expansive wedge comprising:

• a prismatic wedge member having an hourglass shaped longitudinal cross-section and a generally triangular transverse cross-section with a hypocycloid perimeter, said prismatic wedge member comprising:
• a distal tip;
• a proximal interconnect having a polygonal casing;
• a non-expansive apical ridge disposed longitudinally and apically between the distal tip and the proximal interconnect;
• a furled bottom side moveable between a first position and an expanded position, said furled bottom side yet compressible when disposed in the first position and thereby compressible for fit between adjacent teeth;
• a pair of basal ridges bounding the furled bottom side, each of said pair of basal ridges longitudinally disposed between the distal tip and the proximal interconnect;
• a flexible tube sealably connectable at the proximal interconnect, said flexible tube having a plurality of corrugations transversely disposed thereupon;
• and
• an inlet housing disposed endwise upon the flexible tube, said inlet housing sealably connectable to an air syringe;
• wherein fluid is forcibly compressible into the wedge member through the flexible tube when connected at the proximal interconnect and expansion of the furled bottom side is thereby effective to force each of the pair of basal ridges apart, whereby consistent, even contact of each basal ridge with adjacent teeth is uniformly applicable and an existing matrix band in appropriate position is thereby uniformly maintainable in taut supporting contact bounding a cavosurface without intrusion therein.