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Organic overlayer model of a dental composite analyzed by laser desorption postionization mass spectrometry and photoemission
Author(s) -
Zhou Manshui,
Wu Chunping,
Edirisinghe Praneeth D.,
Drummond James L.,
Hanley Luke
Publication year - 2006
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.30591
Subject(s) - materials science , overlayer , composite material , dental composite , methacrylate , composite number , chemical bond , silane , silanes , covalent bond , polymer , polymerization , organic chemistry , chemistry
Some dental composites consist of a polymerizable resin matrix bound to glass filler particles by silane coupling agents. The resin in these composites includes bisphenol A diglycidyl methacrylate (Bis‐GMA) as well as other organic components. Silane coupling agents such as 3‐(trimethoxysilyl) propyl methacrylate (MPS) have been used to improve the mechanical properties of the dental composites by forming a covalent bond between the glass filler particles and the resin. These resin–glass composites undergo material property changes during exposure to the oral environment, but degradation studies of the commercial composites are severely limited by their chemical complexity. A simplified model of the dental composite has been developed, which captures the essential chemical characteristics of the filler particle–silane–resin interface. This model system consists of the resin matrix compound Bis‐GMA covalently bound via a methacryloyl overlayer to amorphous silicon oxide (SiO 2 ) surface via a siloxane bond. Scanning electron microscopy shows the porous characteristic and elemental composition of the SiO 2 film, which approximately mimics that of the glass filler particles used in dental composites. LDPI MS and XPS verify the chemistry and morphology of the Bis‐GMA‐methacryloyl overlayer. Preliminary results demonstrate that LDPI MS will be able to follow the chemical processes resulting from aging Bis‐GMA‐methacryloyl overlayers aged in water, artificial saliva, or other aging solutions. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res, 2006