Synthesis and characterization of ladder structured ormocer resin of siloxane backbone and methacrylate side chain

摘要

Available resin-based hard tissue restorations are highly influenced by the problems associated with post-polymerization shrinkage and toxicity of uncured monomers. To address this scenario, we have synthesized an ormocer resin (LSM) of inorganic siloxane backbone using the monomer 3-(trimethoxy silyl)propyl methac-rylate (3-TMSPM) by modified sol gel method. The synthesized polycondensed LSM resin is fashioned with three-dimensional network of ladder structured Si-O-Si backbone which grow continuously to form higher molecular weight (Mn-18956 KDa) prepolymer. Four membered siloxane rings along with intact methacrylates constituted the monomeric unit of the prepolymer LSM. High thermal stability indicated the presence of intense siloxane network whereas low glass transition temperature and melting peak demonstrated the flexibility and partial crystallinity of the LSM resin. Low linear polymerization shrinkage (LPS) of cured LSM resin (0.422 +/- 0.04) witnessed the presence of inorganic siloxane backbone and performed better than cured bisphenol glycidyl methacrylate (BisGMA)composite (0.916 +/- 0.09). Non-cytotoxicity and cytocompatibility of the cured LSM resin proved the eligibility of the resin for hard tissue restorative applications.