Exhibit 99.1

  National Dentex Corporation Announces Delay in Filing Form 10-K

    WAYLAND, Mass.--(BUSINESS WIRE)--March 31, 2005--National Dentex
Corporation (NASDAQ:NADX), one of the largest owner/operators of
dental laboratories in the United States, today announced that it
would not be able to file with the Securities and Exchange Commission
("SEC") its Annual Report on Form 10-K for the fiscal year ended
December 31, 2004 (the "Form 10-K") by the extended due date of March
31, 2005.
    On March 16, 2005, National Dentex filed with the SEC a Form
12b-25 (Notification of Late Filing) indicating it could not, without
unreasonable effort or expense, complete the process of closing its
accounting records and preparing and filing its Form 10-K within the
prescribed time period (namely March 16, 2005) that was applicable to
it as an accelerated filer, as defined under Rule 12b-2 under the
Securities Exchange Act of 1934, as amended (the "Exchange Act").
National Dentex indicated that it was filing Form 12b-25 to extend the
prescribed time period for filing the Form 10-K to March 31, 2005.
    As National Dentex had indicated in its Form 12b-25 filing,
various new disclosures mandated by Form 10-K, including the new
internal control over financial reporting requirements of the
Sarbanes-Oxley Act, have taken longer to complete than expected
because it has a decentralized organization of 45 laboratories located
across 30 states and also because it had consummated acquisitions
during the fiscal year ended December 31, 2004. The decentralized
nature of its operations and its acquisition activity have increased
the complexity and expense of its compliance with the various new
disclosure requirements and resulted in delays in finalizing its
consolidated financial statements. While National Dentex's management
believed that it would be able to file the Form 10-K within the
extended time period made available to it by filing a Form 12b-25,
National Dentex was not able to complete the process of closing its
accounting records, preparing its Annual Report on Form 10-K, and
finalizing its consolidated financial statements within this extended
time period.
    National Dentex still needs additional time to analyze, in
connection with its independent auditors, an evaluation report with
respect to the valuation of customer relationships of an acquisition
that it consummated during fiscal 2004 that was submitted to it on
March 30, 2005 by an independent third-party accounting firm. The late
timing of the submission of the evaluation report to National Dentex
was such that neither National Dentex nor its independent auditors
have had sufficient time to analyze the report prior to completing the
process of closing National Dentex's accounting records, and thereby
finalizing its Annual Report on Form 10-K and the accompanying
consolidated financial statements.
    Commenting on today's announcement, David L. Brown, President and
CEO, said: "National Dentex intends to continue working diligently
with its independent auditors at PricewaterhouseCoopers LLP to
finalize its Annual Report on Form 10-K. We regret that we were not
able to complete this process this year by the extended due date of
March 31, 2005, but the various new disclosures and documentation
requirements and accelerated filing timetables imposed on us by the
Sarbanes-Oxley Act and other recent SEC regulations have been
difficult challenges for us to deal with this year on the accelerated
timeframe given the decentralized nature of our operations and some
additional documentation requirements needed in connection with our
acquisition activity. "

    About National Dentex

    National Dentex Corporation serves an active customer base of over
20,000 dentists through 45 dental laboratories located in 30 states.
National Dentex's dental laboratories provide a full range of
custom-made dental prosthetic appliances, including dentures, crowns
and fixed bridges, and other dental specialties.

    Safe Harbor Statement

    This press release contains forward-looking statements within the
meaning of the federal securities laws, including statements regarding
our future performance, opportunities, and expected courses of action,
that are based on our current expectations, beliefs, assumptions,
estimates, forecasts and projections about the industry and markets in
which National Dentex operates. The statements contained in this
release are not guarantees of future performance and involve certain
risks, uncertainties and assumptions that are difficult to predict.
Therefore, actual outcomes and results may differ materially from what
is expressed in such forward-looking statements. Important factors
that may affect future operating and financial results include the
timing, duration and effects of adverse changes in overall economic
conditions; National Dentex's ability to acquire and successfully
operate additional laboratories; governmental regulation of health
care; trends in the dental industry towards managed care; increases in
labor, benefits and material costs; product development risks;
technological innovations; compliance with evolving federal
securities, accounting, and marketplace rules and regulations
applicable to publicly-traded companies on the NASDAQ National Market;
and other risks indicated from time to time in National Dentex's
filings with the Securities and Exchange Commission.

    CONTACT: National Dentex Corporation
             Richard F. Becker, 508-358-4422
             Vice President, Treasurer & CFO