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GC-MS and Surface Characteristics of Polyvinyl Siloxane-An In Vitro Analysis
K Kasim Mohamed1, R Fathima Banu1, V Anand Kumar1
1Department of Prosthodontics, Faculty of Dental Science, Sri Ramachandra Institute of Higher Education and Research, Chennai 600116, India.
Objective:
To assess the surface characteristics, composition and release of components of Polyvinyl siloxane (PVS) impression material and explore the use of the material other than for impressions.
Methods:
Forty samples of 0.5-mm thickness and 8-mm diameter PVS discs, with few perforations, were prepared and divided into four groups. Group 1 in methanol was analyzed by GC-MS immediately and on 1st, 7th and 14th day. Group 2 and 3 placed in 10 mL of human saliva and in artificial nasal fluid, respectively, were analyzed by GC-MS at 24 hours. Group 4 was subjected to surface characteristics analysis by placing five PVS discs each in 1 mL of human saliva and 1 mL of artificial nasal fluid, respectively.
Results:
On Day 1, Dodecanoic acid, methyl ester, Cyclononasiloxane, octadecamethyl, Cyclodecasiloxane and eicosamethyl (four peaks) were observed in Group 1. At 24 hours, Group 2 had additional compounds of 2-Decene,7-methyl-(Z)-, 2-Undecene,8-methyl-(Z)- and Lauryl acetate. Group 3 showed release of 32 compounds, but their retention time was less. Surface characteristics on Day 14 revealed no noticeable changes.
Conclusions:
The study revealed that there was a lack of any adverse component release from PVS for a period of 2 weeks based on GC-MS analysis.
