[Some studies on the ability appreciation of dental handpieces (author's transl)].

Dental handpieces are usually used for cutting teeth instruments of dental treatments. But as ability appreciation of cutting instruments are widely influenced with cutting tools and then these studies have scarcely been reported until now. This paper shows the one method of the ability appreciation of handpieces which are used for test bur as the cutting tools. Test apparatus used for ability appreciation are manufactured for trial as the same way as the dental treatments and experiments of handpiece are carried out. Handpiece test specimens are standard type (air bearing type) made by own country as basic characteristics and then compering with the ability of the type differences, standard, miniature, supertorque and air bearing type made by foreign country are experimented. These results of tests are examined the influence of service air pressure and load speed to be bases on the relation between push load revolution of test burs. And then equivalent efficiency of the works of handpieces are discussed for the experimental results of these characteristics.