Quad-C Management, a private equity firm, completed an investment in U.S. Endodontics Partners, an endodontics-focused specialty service organization. Financial terms were not disclosed. "We have been impressed with the growth of U.S. Endo and the culture of continuous improvement that they have built to date," said Frank Winslow. "We share the doctors' and management's enthusiasm regarding the partnership and outlook for U.S. Endo," Frank Winslow, Quad-C Partner.