Offer valid 4/1/13 - 6/30/13 Buy 4 Tetric Evo Ceram,Tetric EvoFlow refills, or Tetric EvoCeram Bulk Fill, or IPS Empress Direct, Get 1 of the same FREE! To receive free goods, please fax a dated Patterson invoice to Ivoclar Vivadent @ 716-691-2285 or mail to 175 Pineview Drive, Amherst NY 14228. Please specify shades where necessary. Invoice must be received by 7/31/13. Purchase and free refills must be same brand and delivery form. No mixing and matching. Ivoclar reserves the right to change or cancel this promotion at any time.