[Comparative measurements of standard drills and turbines]

Standard electric micromotors as well as accessory handpieces and right-angle handpieces were subjected to technical tests. Turbines with and without traction power (bearing power) were also studied. The rotational speed could be regulated on one turbine. Normal to high rotational speeds were obtained with electric micromotors when used in conjunction with the transferance attachment. The motors functioned well in terms of the linearity of rotational speed. The study of the rotational speed, regulation of rotational speed, and traction power of the turbines showed that the rotational speed and the possibility of so-called contact grinding of the turbine is equal to that of micromotors. In terms of grinding trauma to the pulp and gingiva, the indications shifted in favor of the turbine.