Back in 1992 I happened up the Sonicaire toothbrush while on vacation.
When I returned I whittled off the plastic toothbrush, finding a metal rod beneath it. I then attached one of our Fine Cut Sonic Adapters to it.
It was really amazing how fast it cut. For a couple years we marketed this modification for Sonicaire toothbrushes and many dentists used them very successfully.
It is no longer available commercially.
It has been replaced by the FineCut Endo Contra Angle.
STS stands for "Successor To Sonics".
It is a modification of a battery powered electric toothbrush that moves the file linearly in an out of the canal a precise half a millimeter about 250 times per second.
Anyone who has done circumferential filing will recognize that it does mechanically, consistently and accurately what you have been doing with great difficulty all these years.
It is safe, effective and FAST.
It is common to enlarge a canal from size 15 to 50 in as little as two minutes using as few as two files.
As we have been telling people for years sonics do not cut.
All they do is vibrate to make the cutting smoother by reducing the coefficient of friction so that you can cut by moving the file past the tooth structure.