TABLE 1. Original means of microhardness and standard deviation presented by the study groups on the top and bottom of specimens.
| Top | Bottom | |||
|---|---|---|---|---|
| Group | Mean | SD | Mean | SD |
| I | 59.9 | 2.78 | 40.8 | 2.03 |
| II | 57.4 | 2.39 | 40.0 | 1.80 |
| III | 58.4 | 1.57 | 39.8 | 0.70 |
| IV | 58.0 | 1.83 | 37.4 | 1.15 |
| V | 58.2 | 3.62 | 30.7 | 1.38 |
| VI | 55.2 | 3.64 | 28.6 | 1.46 |
| VII | 52.5 | 3.41 | 28.1 | 1.29 |
| VIII | 51.9 | 2.45 | 27.2 | 1.75 |
| IX | 54.2 | 1.92 | 32.1 | 0.62 |
| X | 46.6 | 1.15 | 29.4 | 1.15 |
| XI | 43.9 | 2.07 | 26.7 | 2.52 |
| XII | 44.5 | 2.30 | 22.7 | 1.64 |
| XIII | 60.6 | 1.39 | 42.8 | 1.16 |
| XIV | 60.2 | 3.27 | 42.2 | 1.52 |
| XV | 61.8 | 1.95 | 40.4 | 0.89 |
| XVI | 61.6 | 1.58 | 41.4 | 0.98 |