Mechanical dental drills from 9000 years ago till nowAbraham Cancino29 de August de 2014 Mechanical dental drills from 9000 years ago till now. Fortunately, the things have changed a lot. 1. 15 rotations per minute2. 300 rotations per minute3. About 30.000 rotations per minute4. 400.000 – 800.000 rotations per minute
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