Abstract : Tri Auto ZX2 can be used for patency and glide path according to the manufacturer's instruction manual. However, no reports have verified these details. This study examined whether Tri Auto ZX2 can achieve patency and a glide path.

 The orifice of extracted human premolars was enlarged using #35. 08 EndoWave. Patency and glide path were prepared using OGP mode 180°, 300rpm in Tri Auto ZX2.

Group 1 : Patency was possible with D-finder #10, but not with D-finder #15. EndoWave MGP #15 was used for the glide path.

Group 2 : Patency was possible with D-finder #10, but not with D-finder #15. Superfile #15 was used for the glide path.

Group 3 : Patency was not possible with D-finder #10 or #15. EndoWave MGP #10 was used for patency.

Group 4 : Patency was not possible with D-finder #10 or #15. Superfile #10 was used for patency.

 A glide path could be prepared in all root canals in groups 1 and 2. Patency was possible in 49.1% of root canals in group 3 using Endowave MGP#10 with Tri Auto ZX2 OGP mode. Patency was possible in 68.7% of root canals in group 4 using superfile #10 with Tri Auto ZX2 OGP mode. 31.3% of stainless-steel files in group 4 broke when using OGP mode.

 It is suggested that Tri Auto ZX2 is a good motor for achieving patency and glide path after negotiation using D-finder #10.