1 EXHIBIT 11 NATIONAL DENTEX CORPORATION COMPUTATION OF NET INCOME PER SHARE YEAR ENDED DECEMBER 31, -------------------------------------- 1995 1996 1997 ---- ---- ---- Computation of Basic Net Income per Share: Net Income applicable to common stock.................. $3,243,808 $3,704,926 $4,346,836 Shares: Weighted average common shares outstanding........ 3,175,150 3,414,411 3,454,473 Basic net income per share........................ $ 1.02 $ 1.09 $ 1.26 ========== ========== ========== Computation of Diluted Net Income per Share: Net income per computation above....................... $3,243,808 $3,704,926 $4,346,836 ---------- ---------- ---------- Shares: Weighted average common shares outstanding........ 3,175,150 3,414,411 3,454,473 Add: Shares issuable from assumed exercise of options and warrants (as determined by the application of the treasury stock method)....... 252,059 94,820 62,297 ---------- ---------- ---------- Weighted average common shares outstanding as adjusted........................................ 3,427,209 3,509,231 3,516,770 ---------- ---------- ---------- Fully diluted net income per share................ $ 0.95 $ 1.06 $ 1.24 ========== ========== ==========