Novel Dental Resins From Trialkoxysilanes and Dental Monomers by in Situ Formation of Oligomeric Silyl Ethers and Silsesquioxines
Joseph M. Antonucci, Bruce O. Fowler, Sabine H. Dickens, N D. Richards
The silane coupling agent 3-methacryloxypropyltrimethoxysilane (MPTMS) is commonly used to surface modify (silanize) glass fillers for the reinforcement of dental and other acrylic polymer-based composites. Surface modification of the glass filler phase can be effected by adding MPTMS to the matrix-forming monomer phase (in situ silanization). It appears plausible that adding MPTMS, or similar trialkoxysilanes, to the resin phase also may promote interactions involving the monomeric components, especially if they contain hydroxylated monomers such as Bis-GMA. Many currently used dental monomers also have non-hydroxyl polar groups in their chemical structures that can serve as sites for water absorption. Previous studies have shown that MPTMS and other trialkoxysilanes in the presence of water can form oligomeric silsesquioxanes by a complex sequence of hydrolysis-condensation reactions.In this study we investigated the reaction of MPTMS (and several related trialkoxysilanes) with four commonly used dental monomers. It was found that the dihydroxylated dimethacrylate, Bis-GMA, formed predominately oligomeric silyl ethers by an exchange reaction with MPTMS whereas polar, but non-hydroxylated dimethacrylates formed oligomeric silsesquioxanes, presumably due to the hydrolysis-condensation reactions of MPTMS induced by the presence of water in these monomers. Supported by NIST/NICDR Interagency agreementYI-DE-1021-02 and ADAHR-PRC. A74
American Chemical Society; Division of Polymer Chemistry, National Meeting | 224th | | American Chemical Society (ACS)
, Fowler, B.
, Dickens, S.
and Richards, N.
Novel Dental Resins From Trialkoxysilanes and Dental Monomers by in Situ Formation of Oligomeric Silyl Ethers and Silsesquioxines, American Chemical Society; Division of Polymer Chemistry, National Meeting | 224th | | American Chemical Society (ACS)
(Accessed November 30, 2023)