What endodontics contra angle can be used in pneumatic micromotor?

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In the case of mechanical files, we advise the use of contra angle FXM 700 70:1, let us understand: Generally the pneumatic micromotor rotation has between 20000 and 25000 RPM, then we have on file a rotation of 25000/70 = 357 RPM. In the case of hand files, we advise the use of contra angle FXR 160 16:1, let us understand: Generally the pneumatic micromotor has between 20000 and 25000 RPM, then the file has a speed of 25000/16 = 1562.5 oscillations per minute.

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