W&H - Dental Handpieces - What should you look for
Contra-angle handpieces are available in various step-up and step-down ratios. An air motor with a 2:1 contra-angle handpiece step-down ratio thus reaches a speed of approx. 12,500 min-1. Electric motors reach an idle speed of up to 40,000 min-1. This corresponds to a bur speed of 200,000 min-1 for 1:5 contra-angle handpieces. The maximum power is over 60 W and the torque is approx. 3 …
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