Table 2.
Mean total number of tubules in four experimental groups
| Groups | No. of specimen | Total no. of dentinal tubules | Mean ± SD | Diff. between groups | |
|---|---|---|---|---|---|
| Groups compared | Significance | ||||
| I Tetracycline HCl | 20 | 630 | 31.5 ± 3.10 | I and II | P < 0.05 |
| II Minocycline | 20 | 455 | 22.75 ± 3.13 | I and III | P < 0.05 |
| III Doxycycline | 20 | 452 | 22.6 ± 2.54 | I and IV | P < 0.05 |
| IV Citric acid | 20 | 570 | 28.5 ± 3.52 | II and III | P > 0.05 |
| II and IV | P < 0.05 | ||||
| III and IV | P < 0.05 | ||||
The Excel and SPSS (SPSS Inc, Chicago) software, student ‘t’, Chi-square test of significance (proportion)