Effect of repetitive up-and-down movements on torque/force generation, surface defects and shaping ability of nickel-titanium rotary instruments: an ex vivo study

• Main Authors: Moe Sandar Kyaw (Author), Arata Ebihara (Author), Yoshiko Iino (Author), Myint Thu (Author), Keiichiro Maki (Author), Shunsuke Kimura (Author), Pyae Hein Htun (Author), Takashi Okiji (Author)
• Format: Book
• Published: BMC, 2024-08-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Abstract Background The screw-in effect is a tendency of a nickel-titanium (NiTi) rotary endodontic file to be pulled into the canal, which can result in a sudden increase in stress leading to instrument fracture, and over-instrumentation beyond the apex. To reduce screw-in force, repeated up-and-do...