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Study groups.
| Group | n | Procedure |
|---|---|---|
| C | 15 | Control |
| CL | 15 | Bleaching |
| PC + TAR | 15 | (PC + TAR) + Bleaching |
| PC + ZBR | 15 | (PC + ZBR) + Bleaching |
| AC + TAR | 15 | (AC + TAR) + Bleaching |
| AC + ZBR | 15 | (AC + ZBR) + Bleaching |
C (Control); CL (Bleaching); PC (pre-etched adhesive system); AC (self-etching adhesive); TAR (High speed multi-laminated tungsten carbide drill); ZBR (Low speed multi-laminated zirconia drill).
