[Experimental rationale of hand stabilization devices use by teeth preparation].

This paper compares two methods of teeth preparation - with or without mechanical hand stabilization device preventing accidental angular deviations of dental handpiece during preparation. The results of two experiment series showed decreased convergence of side walls of the prepared teeth in cases when mechanical hand stabilizer corresponding to the values recommended in literature. It is concluded that mechanical hand stabilization device is a useful tool for improving the quality of preparations.