[Peak-to-valley height measurement and scanning electron microscopy of cavity walls (author's transl)]

Using a feeler type of cutting mechanism and a scanning electron microscope, cavity walls were examined subsequent to the preparation thereof with various types of working tools. The combination of these two methods of examination allows results to be obtained which are far better than those achieved with the use of one of these methods alone. The most unfavourable configuration of the cavity wall is obtained using a turbine (diamond). It is especially in the case of inlay preparations that it is necessary for the walls of cavities prepared using a turbine to be retreated by means of a normal-speed type of instrument. Smoothest surfaces are generally obtained with the use of a finisher.