Our office uses electric handpieces instead of the older air turbine handpieces.  Present electric technology provides us with cutting instruments that are more efficient than air turbines. Cavity preparation is quicker, more precise, and less traumatic with modern electrical technology than is possible with air turbines.  Moreover, electrical systems are quiet. The characteristic loud hissing noise of the air turbine should be a thing of the past when replaced by a quiet, consistent, efficient electrical system.