1 Exhibit 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in this Registration Statement on Form S-8, pertaining to National Dentex Corporation's 1992 Long Term Incentive Plan, of our report dated February 4, 1998 on the financial statements included in the 1997 Annual Report on Form 10-K for the year ended December 31, 1997 and to all references to our firm included in this registration statement. /s/ ARTHUR ANDERSEN LLP - ------------------------------- Boston, Massachusetts April 15, 1998