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| Year 4 | Year 5 | t -test | |||
|---|---|---|---|---|---|
| Mean | Standard deviation (±) | Mean | Standard deviation (±) | ||
| Note: The significance level is set at p < 0.05. | |||||
| Dentin hardness | 2.70 | 0.928 | 2.89 | 0.731 | 0.048 |
| Dentin color | 3.34 | 1.134 | 3.52 | 1.023 | 0.138 |
| Dentin moisture | 1.78 | 0.772 | 1.67 | 0.712 | 0.186 |
