Evaluation of some properties of elastomeric dental impression materials after disinfection

Abstract

Backgrounds and objectives: Dental impressions present a risk to spread infections among dental practitioners and should be disinfected to prevent the spread of these microorganisms. Different disinfectant materials and techniques can be used to eliminate this threat. The purpose of this study was to evaluate the effect of some disinfectant materials with two different techniques on surface detail and dimensional stability of elastomeric impression materials. Materials and methods: Three dental impression materials were used in this study, Vinyl polysiloxane, Polyether and Vinyl polyether siloxane that were disinfected with sodium hypochlorite, Dettol and Cavex Impresafe by using two techniques, spraying and immersion methods for each. Results: The results of this study showed a significant difference of the dimensions between immediate and 48 hours after disinfection P<0.05 with the maximum change (1.5%) appeared with vinyl polysiloxane material when immersed in sodium hypochlorite for 10 minutes and stored for 48 hours, but this change was acceptable by the ADA. Polyether showed the least dimensional change of 0.05% after 7 hours from disinfection with Cavex impresafe and the latter caused the least change on the impression materials. Conclusion: Within the limitations of this in vitro study, it was concluded that dental impression materials can be disinfected without causing dimensional changes that affect the manufacture of dental prosthesis.

Effect of propolis on the mechanophysical properties of addition silicon dental impression material

“…In order to normalize the test block's temperature to intraoral temperature, it was immersed in a water bath at 35°C for 15 minutes. 25,26 In accordance with ISO 4823:2015, impression material was injected and slightly overfilled the ring mold onto the test block, then covered with polyethylene sheet, the assembly was then placed back in a water bath to simulate oral temperature, a glass slab was placed on top, and a one kilogram of weight was added to the assembly to simulate the pressure of the hand on the tray. 27 According to ISO 4823:2015 for lab testing, the specimens were taken out of the ring mold two minutes after the manufacturers recommended minimum removal time, and any excess was cut away using blade number 15 26 and then washed for 15 seconds under running distilled water as directed by the manufacturer.…”

Untitled

“…The US Environmental Protection Agency and the Centers for Disease Control and Prevention consider hypochlorous acid a very high-level disinfectant due to its widespread usage worldwide. There is a wide range of bacteria and viruses that this simple chemical combination may kill quickly and effectively [18]. Glutaraldehyde is considered as a high-level disinfectant, and many studies suggest its use to disinfect polyether impression and the best suggested time for disinfection is 10 minutes that not to affect properties of impression material [19], so it has been used in this study as a positive control.…”