Materials and Methods: Ten WOG Primary (25/0.07) (WOG, Dentsply Maillefer, Ballaigues, Switzerland) and ten RB R25 (25/0.08) (RB, VDW, Munich, Germany) files were included in the present study.
Đối tượng – Phương pháp nghiên cứu: Thử nghiệm trên 10 trâm WOG Primary (WOG, Dentsply Maillefer, Ballaigues, Switzerland) và 10 trâm RB R25 (RB, VDW, Munich, Germany).