The instrument transfer method in four handed dentistry in dental operating microscope as a module of a training program in the aspect of reduction of the dynamic load of the visual system of the operator

Resume. Introduction of a Dental Operating Microscope (DOM) in the clinical work can make some difficulties in operator’s work.In particular, to ensure the safety of the operator’s visual system and ergonomics of the work, the operator’s gaze should be continuously directed to the operating field. The instruments should be moved over the operating field by the assisting personnel, whose participation in the transfer is not complete until the evening nstrument is visible through the microscope and the operator is fully capable of controlling its movement. Instrument transfer method in DOM includes 3 steps: modified direct placement, predelivery, delivery and exchange of instruments. In the presented method the most important elements are the properly oriented end of the instrument by dental assistant and mutual grasp of instrument. The method allows to reduce the load on the operator’s visual system and to make four-handed work ergonomic. Key words: dental operating microscope (DOM), four-handed dentistry in DOM, instrument transfer in DOM, mutual grasp, visual system overload of dental operator.