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Abstract

Knowing the detailed pattern of the teeth and the surrounding tissues is important to make a good impression. Vinyl siloxanether is a promising option to save the characteristics of the impressions after disinfection. This study was designed to evaluate the effect of disinfection on dimensional stability of the light consistency of vinyl siloxanether. The samples were made according to the recommendation of the American Dental Association (ADA). Forty five impression ingots of vinyol siloxanether  were made and divided in three groups . First group samples were immersed in a 5.25% sodium hypochlorite solution. Second group were placed in a 2% deconex solution and last group considered as the control group. Measuring the dimensional changes on the samples was done by Digimizer image analysis software with an accuracy of 1 micron immediately, after 1-week and 2-week storage. The sodium hypochlorite group showed the highest dimensional changes in all time frames. There was a significant difference in dimensional changes between groups after two weeks (F=19.52, p=<0.001). There was a significant difference in dimensional changes between the sodium hypochlorite group and the deconex group and also between the control and the sodium hypochlorite group (mean differences=0.02, -0.03; 95%CI=(0.01-0.04), (-0.04- -0.02), respectively; both p-values<0.001). Dimensional changes increased over time (p<0.001). Light-bodied vinyl siloxanether shows acceptable dimensional stability after disinfection. Immersion in the deconex solution for two minutes causes fewer changes.

Keywords: Vinysiloxanether, Dimensional stability, Disinfection, Impression material