J Adv Prosthodont.  2017 Jun;9(3):182-187. 10.4047/jap.2017.9.3.182.

The effect of prolonged storage and disinfection on the dimensional stability of 5 vinyl polyether silicone impression materials

• Nassar U
• Flores-Mir C
• Heo G
• Torrealba

• KMID: 2382604
• DOI: http://doi.org/10.4047/jap.2017.9.3.182

Abstract

PURPOSE
Vinyl polyether silicone (VPES) has a different composition from other elastomeric impression materials as it combines vinyl polysiloxane (VPS) and polyether (PE). Therefore, it is important to study its properties and behavior under different test conditions. This study investigated the dimensional stability of 5 VPES consistencies when stored for up to 2 weeks, with and without using a standard disinfection procedure.
MATERIALS AND METHODS
40 discs of each VPES consistency (total 200) were made using a stainless steel die and ring as described by ANSI /ADA specification No. 19. 20 discs of each material were immersed in a 2.5% buffered glutaraldehyde solution for 30 minutes. Dimensional stability measurements were calculated immediately after fabrication and repeated on the same discs after 7 and 14 days of storage. The data was analyzed using two-way ANOVA with a significance level set at α = 0.05.
RESULTS
The discs mean contraction was below 0.5% at all test times ranging from 0.200 ± 0.014 to 0.325 ± 0.007. Repeated measures ANOVA showed a statistically significant difference after 2-week storage between the disinfected and non-disinfected groups (P < .001). Although there was no statistically significant difference between the materials at the time of fabrication, the contraction of the materials increased with storage for 1 and 2 weeks.
CONCLUSION
The dimensional changes of VPES impression discs after disinfection and prolonged storage complied with ANSI/ADA standard. The tested VPES impression materials were dimensionally stable for clinical use after disinfection for 30 minutes in glutaraldehyde and storage for up to 2 weeks.

Keyword

Impression material; Dimensional stability; Disinfectant; VPES; Prolonged storage

MeSH Terms

Disinfection*
Elastomers
Glutaral
Silicon*
Silicones*
Siloxanes
Stainless Steel
Elastomers
Glutaral
Silicon
Silicones
Siloxanes
Stainless Steel

Figure

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  Fig. 1 (A) Representative impression material disc, (B) The metal die used for making the discs, (C) Diagram of the metal ring showing line C measurement between points D1 and D2.

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  Fig. 2 Percent mean contraction of the impression materials at three time points.

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  Fig. 3 Average contraction of all materials per time point.

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