[PAR] [TLE] Nickel [SEP] Nickel is a chemical element with symbol Ni and atomic number 28.  It is a silvery-white lustrous metal with a slight golden tinge.  Nickel belongs to the transition metals and is hard and ductile.  Pure nickel, powdered to maximize the reactive surface area, shows a significant chemical activity, but larger pieces are slow to react with air under standard conditions because an oxide layer forms on the surface and prevents further corrosion (passivation).  Even so, pure native nickel is found in Earth's crust only in tiny amounts, usually in ultramafic rocks, and in the interiors of larger nickel–iron meteorites that were not exposed to oxygen when outside Earth's atmosphere. [PAR] [TLE] Rotary technology [SEP] Rotary endodontic files use an engine to rotate the endodontic file during root canal treatment.  The advantages of rotary endodontics are reduced instrumentation times and fewer files used during the procedure.  Commonly Nickel-Titanium files are used because of their greater flexibility which permits increasingly curved roots to be treated.  The use of Ni-ti files comes at a cost of at increased risk of fractured endodontic files, possibly necessitating endodontic retreatment.
[PAR] [TLE] Nickel [ SEP ] Nickel is a chemical element with symbol Ni and atomic number 28 . It is a silvery - white lustrous metal with a slight golden tinge . Nickel belongs to the transition metals and is hard and ductile . Pure nickel , powdered to maximize the reactive surface area , shows a significant chemical activity , but larger pieces are slow to react with air under standard conditions because an oxide layer forms on the surface and prevents further corrosion ( passivation ) . Even so , pure native nickel is found in Earth 's crust only in tiny amounts , usually in ultramafic rocks , and in the interiors of larger nickel – iron meteorites that were not exposed to oxygen when outside Earth 's atmosphere . [PAR] [TLE] Rotary technology [ SEP ] Rotary endodontic files use an engine to rotate the endodontic file during root canal treatment . The advantages of rotary endodontics are reduced instrumentation times and fewer files used during the procedure . Commonly Nickel - Titanium files are used because of their greater flexibility which permits increasingly curved roots to be treated . The use of Ni - ti files comes at a cost of at increased risk of fractured endodontic files , possibly necessitating endodontic retreatment .
What property does Rotary technology and Nickel have in common?
What property does Rotary technology and Nickel have in common ?
flexibility
flexibility