Dimensional Change of Elastomeric Materials after Immersion in Disinfectant Solutions for Different Times

Abstract

Aim The aim of this study was to evaluate the influence of immersion period in two disinfectant solutions on dimensional change of four elastomeric impression materials. Materials and methods Four representative materials of each class of elastomers: Xantopren (polydimethylsiloxane—PDS), Express (polyvinyl siloxane—PVS); Permlastic (polysulfide— PS) and Soft Impregum (polyether—EP) were mixed according to manufacturers’ instructions and then inserted into a metal matrix prepared according to the specification of ISO 4823. The molds were removed from the matrix after 7 minutes and immersed in disinfectant solutions (sodium hypochlorite 0.5 and 2% glutaraldehyde) for 5, 10, 20, 30 and 60 minutes (n = 7), except the control group, which was not immersed. Once removed from solutions, the test samples were washed in water for 15 seconds, dried and measured three times, using a comparative optical microscope, with accuracy of 0.0005 mm. The analysis of variance with three criteria and Tukey's test with significance level of 5% showed that differences in linear dimensions of the materials analyzed were not statistically significant (p > 0.05) after soaking in sodium hypochlorite 0.5 and 2% glutaraldehyde, for the tested periods of time. Clinical significance Combinations of molding material and disinfecting solution can be used in the dental clinic for infection control, without changing the dimensional molds, for immersion periods not longer than 20 minutes. How to cite this article Carvalhal CIO, de Mello JAN, Sobrinho LC, Correr AB, Sinhoreti MAC. Dimensional Change of Elastomeric Materials after Immersion in Disinfectant Solutions for Different Times. J Contemp Dent Pract 2011;12(4): 252-258.

The effect of disinfectants on dimensional stability of addition and condensation silicone impressions

“…Evaluating the influence of immersion period in disinfectant solutions on dimensional change of elastomers, Carvalhal et al 22 note that there are time limits within disinfection which must be performed, because of the reactivity of disinfecting agents. They also emphasize that in shorter immersion periods, sodium hypochlorite solution lead to greater dimensional change of condensation silicone (Xantopren) compared with glutaraldehyde, which is in accordance with the results of the present study.…”

“…A third limitation is that the prescribed measurements were recorded on a flat surface, disregarding the possibility of dimensional changes in three dimensions. Some studies have used this method 4,21,22 , while the other authors [23][24][25] have introduced different modifications.…”

Evaluation of dimensional accuracy for different complete edentulous impressions immersed in different disinfectant solutions

“…[1719] A number of methods for disinfection have been investigated and recommended including antimicrobial immersion system and/or spraying and then sealing in a bag or spraying system. It has been suggested that immersion system is better than spraying as the latter leads to the pooling effect and its effect is localized.…”

“…[1314] Much work has been undertaken, and results have been reported regarding the surface changes and dimensional stability of the impression material that is subjected to different immersion disinfectants. [111516171819]…”

The Effect of disinfection of Extended-Pour alginate impressions on the surface roughness of stone casts

“…As well as, it is commonly used for preliminary impressions to obtain a study cast used for treatment planning, diagnostic purposes, construction of custom trays or provisional prostheses (2) . Dental impression is considered as a remarkable way for transmission of microorganisms like hepatitis B,tuberculosis or AIDS from the office to other environments because of its contact with saliva and blood during the impression procedure (3,4) .…”