Table 3.
Surface micro-hardnesscomparisonaccording to bracket material, adhesive system, and etchant-type (SD: Standard Deviation, M: Metal, C: Ceramic, TE: Total-Etch, SE: Self-Etch, PC: Pre-Coated, FF: Flash-Free; **: Statistically Significant with p < 0.01, t-test, *: Statistically Significant with p < 0.05, t-test).
|
Surface Micro-hardness Comparison According to Bracket Material | |||||
|---|---|---|---|---|---|
| Etchant Type | Adhesive System | Bracket Material | Mean | SD | p-value |
| TE | PC | M | 384.436 | 18.2218 | 0.7855 |
| C | 386.564 | 17.9471 | |||
| FF | M | 384.345 | 17.7418 | 0.7954 | |
| C | 382.545 | 14.1796 | |||
| SE | PC | M | 404.418 | 14.1233 | 0.0793 |
| C | 390.827 | 19.8703 | |||
| FF | M | 402.655 | 21.4508 | 0.5159 | |
| C | 397.191 | 17.0393 | |||
| Surface Micro-hardness Comparison According to AdhesiveSystem | |||||
| Bracket Material | Etchant Type | Adhesive System | Mean | SD | p-value |
| M | TE | PC | 384.436 | 18.2218 | 0.991 |
| FF | 384.345 | 17.7418 | |||
| SE | PC | 404.418 | 14.1233 | 0.822 | |
| PC | 402.655 | 21.4508 | |||
| C | TE | PC | 386.564 | 17.9471 | 0.567 |
| FF | 382.545 | 14.1796 | |||
| SE | PC | 390.827 | 19.8703 | 0.430 | |
| PC | 397.191 | 17.0393 | |||
| Surface Micro-hardness Comparison According to Etchant Type | |||||
| Bracket Material | Adhesive System | Etchant type | Mean | SD | p-value |
| M | PC | TE | 384.436 | 18.2218 | 0.009** |
| SE | 404.418 | 14.1233 | |||
| FF | TE | 384.345 | 17.7418 | 0.041* | |
| SE | 402.655 | 21.4508 | |||
| C | PC | TE | 386.564 | 17.9471 | 0.603 |
| SE | 390.827 | 19.8703 | |||
| FF | TE | 382.545 | 14.1796 | 0.040* | |
| SE | 397.191 | 17.0393 | |||