GC-MS and Surface Characteristics of Polyvinyl Siloxane-An In Vitro Analysis.

Abstract

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. 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 10mL of human saliva and in artificial nasal fluid, respectively, were analyzed by GC-MS at 24hours. Group 4 was subjected to surface characteristics analysis by placing five PVS discs each in 1mL of human saliva and 1mL of artificial nasal fluid, respectively. On Day 1, Dodecanoic acid, methyl ester, Cyclononasiloxane, octadecamethyl, Cyclodecasiloxane and eicosamethyl (four peaks) were observed in Group 1. At 24hours, 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. The study revealed that there was a lack of any adverse component release from PVS for a period of 2weeks based on GC-MS analysis.