Table 2. Means and standard deviations of cytotoxicity, in terms of pre-heating and type of composite resin (in cellular culture medium with different concentrations) .
| Concentration | |||||||||
| Composite type | Preheating | 100% | 75% | 50% | 25% | ||||
| SD | Mean | SD | Mean | SD | Mean | SD | Mean | ||
| XB | No | 1.51 | 23.01 | .630 | 23.42 | 3.36 | 17.54 | 1.99 | 15.69 |
| Yes | 1.94 | 23.23 | 2.04 | 22.59 | 1.93 | 16.77 | 1.23 | 15.04 | |
| XF | No | 1.43 | 23.72 | 2.50 | 23.24 | 3.34 | 17.68 | 0.21 | 15.04 |
| Yes | 1.58 | 23.34 | 2.90 | 23.43 | 4.28 | 17.49 | 0.22 | 15.34 | |
| TNB | No | 3.88 | 29.87 | 1.89 | 22.63 | 3.59 | 17.58 | .610 | 15.00 |
| Yes | 4.03 | 28.77 | 1.25 | 21.77 | 2.78 | 17.50 | 0.88 | 15.20 | |