Figure 1.
Dental cast model.
Figure 2.
Transfer tray made by vacuum formed stent.
Table I.
Group description.
| Group | Description |
|---|---|
| I | No treatment |
| II | Sandblasting for 3 sec |
| III | Sandblasting for 6 sec |
| IV | Sandblasting for 9 sec |
| V | Sandblasting for 12 sec |
| VI | Low speed round bur |
| VII | Conditioned with adhesion booster |
Figure 3.
Shear bond strength test.
Table II.
Adhesive remnant index criteria.
| Score | The evaluation criteria (remained adhesive on the tooth) |
|---|---|
| 1 | All |
| 2 | More than 90% |
| 3 | Between 10 and 90% |
| 4 | Less than 10% |
| 5 | No adhesive |
Figure 4.
Boxplot diagram of SBS by group. See Table I for group description.
Table III.
Descriptive statistics of shear bond strength. See Table I for group description.
| Shear bond strength(MPa) | ||||||
|---|---|---|---|---|---|---|
| Group | Mean | SD | Minimum | Maximum | N | Scheffe* |
| I | 9.1 | 3.0 | 5.4 | 13.6 | 24 | A |
| II | 16.8 | 2.1 | 13.3 | 18.2 | 24 | B |
| III | 21.0 | 2.8 | 16.9 | 25.8 | 24 | C |
| IV | 21.4 | 3.0 | 16.7 | 26.0 | 24 | C |
| V | 20.2 | 2.9 | 15.9 | 25.8 | 24 | C |
| VI | 16.7 | 1.8 | 15.3 | 19.4 | 24 | B |
| VII | 11.2 | 2.2 | 7.7 | 12.9 | 24 | A |
Table IV.
Frequency distributions of adhesive remnant index scores. See Table I for group description.
| ARI score | ||||||
|---|---|---|---|---|---|---|
| Group | 1 | 2 | 3 | 4 | 5 | n |
| I | 14 | 10 | 0 | 0 | 0 | 24 |
| II | 10 | 8 | 6 | 0 | 0 | 24 |
| III | 2 | 12 | 10 | 0 | 0 | 24 |
| IV | 3 | 12 | 9 | 0 | 0 | 24 |
| V | 4 | 13 | 7 | 0 | 0 | 24 |
| VI | 9 | 9 | 6 | 0 | 0 | 24 |
| VII | 13 | 11 | 0 | 0 | 0 | 24 |
Figure 5.
Microscopic photos of bracket bases. See Table I for group description. Magnification ×2.5.
Figure 6.
Scanning electron micrographs of bracket bases. See Table I for group description. Magnification ×100.