Table 2.

Key studies on the thermal nitridation (TN) of NiTi rotary instruments

Authors	Results
Shenhar et al. [ 27 ]	TN improved the corrosion resistance of Ti and/or Ti alloys in corrosive environments.
Huang et al. [ 28 ]	TN improved the corrosion resistance of Ti and/or Ti alloys in corrosive environments.
Li et al. [ 29 ]	TN of NiTi instruments at various temperatures increased cutting efficiency and corrosion resistance.
Lin et al. [ 30 ]	TN significantly increased the corrosion resistance.