Evaluation of Changes of Geometrical Parameters of Polysiloxane Dental Impressions Due to the Influence of Chemical and Microwave Disinfection Method Using 3D Technologies

This clinical and laboratory study evaluated the effect of two methods of disinfection in different modes at the volume changes of polysiloxane dental impressions and plaster models poured from them, as compared to the same parameters of plastic master models (PMM), using three-dimensional non-contact laser scanner and software. To determine the volume changes of sіlicone impressions, as a result of immersion and microwave methods of decontamination received 270 impressions from plastic master models (PMM) by 5 different polysiloxane materials: Stomaflex, Express, Speedex, Stomavid, Zeta Plus. In all researched groups of silicone impressions that modes did not change volumetric parameters so that it was significantly noticeable, p> 0.05 (5%). Immersion in solutions of chemical disinfectants with an exposure of 15 minutes did not affect significantly the size of silicone impressions compared to the control group. But according to the regulations and guidelines on the use of selected chemical disinfectants, especially dangerous to destroy viruses and bacteria is necessary to prepare working solutions with high concentrations, but this is due to increased spending on this method, as well as increased hazard to medical staff. The method of the microwave disinfection using settings «-UNDADENT" when used "wet smooth combined express" mode reduces the cost of expensive disinfectants in the preparation of working solutions with low concentrations. That is possible through a dual effect on pathogens, namely chemical, thermal and microwave. Microwave method also makes it possible to dispense with all chemical disinfectants using ordinary distilled water and exposure time 10 min. Thus, according to the research results, with 95% confidence we can make assumptions about the safety of methods and disinfection regimes for volumetric parameters of used silicone impressions, besides, Stomaflex, that, in our view, necessary to choose other effective solutions of chemical disinfectants in which they could be immersed with exposure less than 15 min.