Water absorption of (RTV) silicone denture soft lining material

Objectives: 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...

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Bibliographic Details
Published in:	Journal of dentistry Vol. 24; no. 1; pp. 105 - 108
Main Authors:	Waters, M.G.J., Jaggert, R.G., Winter, R.W.
Format:	Journal Article
Language:	English
Published:	England Elsevier Ltd 1996
Subjects:	Absorption Benzoyl Peroxide - analogs & derivatives Benzoyl Peroxide - chemistry Chemical Phenomena Chemistry, Physical Cross-Linking Reagents - chemistry Dentistry Denture Liners Denture soft liner Dicarboxylic Acids - chemistry Dimethylpolysiloxanes - chemistry Microscopy, Electron, Scanning Polymers - chemistry Porosity Silanes - chemistry Silicon Dioxide - chemistry Silicones - analysis Silicones - chemistry Solubility Stress, Mechanical Temperature Tin Compounds - chemistry Water - chemistry Water absorption Denture soft liner Water absorption
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Summary:	Objectives: 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. Conclusion: It was concluded that the filler was directly responsible for the water absorption of the RTV material.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0300-5712 1879-176X
DOI:	10.1016/0300-5712(95)00032-1