Table 3. Descriptive Statistics and Comparison of the Mean Values and Mean Percentage Changes of Dentinal Tubules Number Between the Groups .
| Dentinal Tubules Number | Mean | SD | Median | 95% CI for Mean | Min | Max | P Value | ||
| Lower Bound | Upper Bound | ||||||||
| Before | Control | 21.20 | 5.76 | 20 | 14.05 | 28.35 | 15.00 | 29.00 | 0.092ns |
| Eggshell NPs only | 21.80 | 2.59 | 22 | 18.59 | 25.01 | 18.00 | 25.00 | ||
| Seashell NPs only | 27.40 | 4.34 | 26 | 22.02 | 32.78 | 23.00 | 32.00 | ||
| Eggshell NPS + Nd:YAG laser | 22.20 | 2.95 | 22 | 18.54 | 25.86 | 18.00 | 25.00 | ||
| Seashell NPs + Nd:YAG laser | 25.20 | 2.77 | 26 | 21.75 | 28.65 | 21.00 | 28.00 | ||
| After | Control | 21.20a | 5.76 | 20 | 14.05 | 28.35 | 15.00 | 29.00 | 0.00* |
| Eggshell NPs only | 2.20b | .84 | 2 | 1.16 | 3.24 | 1.00 | 3.00 | ||
| Seashell NPs only | 4.60b | 2.07 | 3 | 2.03 | 7.17 | 3.00 | 8.00 | ||
| Eggshell NPS + Nd:YAG laser | 1.60b | 1.52 | 1 | -0.28 | 3.48 | 0.00 | 4.00 | ||
| Seashell NPs + Nd:YAG laser | 1.80b | 1.92 | 1 | -0.59 | 4.19 | 0.00 | 5.00 | ||
| Percent change |
Control | -0.001y | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.007* |
| Eggshell NPs only | -89.89x | 3.71 | -89 | -94.50 | -85.28 | -95.24 | -86.36 | ||
| Seashell NPs only | -87.34x | 2.94 | -88 | -90.98 | -83.69 | -90.63 | -82.61 | ||
| Eggshell NPS + Nd:YAG laser | -92.68x | 7.17 | -94 | -101.58 | -83.77 | -100.00 | -80.95 | ||
| Seashell NPs + Nd:YAG laser | -92.95x | 6.93 | -96 | -101.56 | -84.34 | -100.00 | -82.14 | ||
Significance level P ≤ 0.05, ns = non-significant, *Significant.
Post hoc test: Within the same comparison, means sharing the same superscript letter are not significantly different.