X0303 4 2009-03-23 0000913616 NATIONAL DENTEX CORP /MA/ NADX 0001207974 BROWN DAVID L 70 EVERETT STREET NATICK MA 01760 1 1 0 0 President, and CEO Common Stock $.01 par value 2009-03-23 4 P 0 2103 4.273 A 62036 D This transaction was executed in multiple trades at prices ranging from $ 4.22 to $ 4.30. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. David L. Brown 2009-03-25