关键词: 镍钛器械, 根管预备, 抗折性

Abstract:

Root canal therapy is the first choice and important treatment method for dental pulp disease and periapical disease. However，one of the most common complications after root canal therapy is the root fracture. Root canal therapy in each step is likely to affect the fracture resistance of root. AS several research revealed，root canal preparation，due to the removal of dentin and root canal morphology change，is more likely to endanger the fracture resistance of tooth root. In recent years，with the development of technique of root canal treatment，Ni-Ti instruments have been used for root canal preparation. But the Ni-Ti instruments with its generally large taper，prepare the root canal with better crown expansion，but also decrease the dentin thickness，which will increase the root fracture. There are different views about the effect of root fracture resistance by using different Ni-Ti instruments in root canal preparation. In this paper，the effect of different Ni-Ti instruments in root canal preparation on root fracture resistance is summarized.

Key words: Ni-Ti instruments, root canal preparation, fracture resistance