Water absorption of (RTV) silicone denture soft lining material.
OBJECTIVE
The reason for high water absorption by room temperature vulcanizing (RTV) silicone denture soft lining materials has not been demonstrated previously. An experimental room-temperature vulcanizing (RTV) silicone soft lining material which had been shown to have good mechanical properties had high water absorption at equilibrium whilst losing only small amounts of soluble material after desorption. The volume change in the material was also high. A variety of formulations of the experimental material was devised in order to determine the cause of the high water sorption values.


METHODS
Water sorption values were determined using standard experimental techniques. Sections of the polymerized materials were examined by scanning electron microscopy for microporosity.


RESULTS
Neither removal of residual cross-linker nor changing the method of polymerization reduced the water absorption. Scanning electron microscopy did not demonstrate a porous structure of the polymerized material. A correlation was seen between filler content and water absorption. A formulation without filler showed a greatly reduced water absorption and volume change.


CONCLUSIONS
It was concluded that the filler was directly responsible for the water absorption of the RTV material.
Waters
M G
MG
Department of Basic Dental Science, Cardiff Dental School, University of Wales College of Cardiff, UK.
Jagger
R G
RG
Winter
R W
RW
D000042:Absorption; D001585:Benzoyl Peroxide / Q000031:analogs & derivatives / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003432:Cross-Linking Reagents / Q000737:chemistry; D003822:Denture Liners; D003998:Dicarboxylic Acids / Q000737:chemistry; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011108:Polymers / Q000737:chemistry; D016062:Porosity; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D012828:Silicones / Q000032:analysis / Q000737:chemistry*; D012995:Solubility; D013314:Stress, Mechanical; D013696:Temperature; D017971:Tin Compounds / Q000737:chemistry; D014867:Water / Q000737:chemistry*
D003432:Cross-Linking Reagents; D003998:Dicarboxylic Acids; D004129:Dimethylpolysiloxanes; D011108:Polymers; D012821:Silanes; D012828:Silicones; D017971:Tin Compounds; D014867:Water; C020714:bis(2,4-dichlorobenzoyl)peroxide; C013830:baysilon; D012822:Silicon Dioxide; D001585:Benzoyl Peroxide