EXHIBIT 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated February 6, 2004 relating to the financial statements and financial statement schedule of National Dentex Corporation, which appears in National Dentex Corporation's Annual Report on Form 10-K for the year ended December 31, 2003. / s / PricewaterhouseCoopers LLP Boston, Massachusetts June 14, 2004 11