Characterizing the performance of dental air-turbine ...
2008-1-1 · The start of the modern turbine era may be 1941, when a patent claimed 25 000 rpm (417 /s) for a design using compressed air at 45 psi (310 kPa). 42 The turbine rotor was unusual: a cylinder with a circular arrangement of holes through which air jets from two nozzles were directed. In addition, ball bearings were to be used (as opposed to the sleeve bearings of earlier handpieces), and the inner ball …
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