S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Journal Papers (저널논문_치의학과)
The mechanical properties and bioactivity of poly(methyl methacrylate)/SiO2-CaO nanocomposite
- Issue Date
- ELSEVIER SCI LTD
- BIOMATERIALS, Vol.30, No.20, pp.3444-3449
- This paper was presented in part at the 20th Annual Meeting of the International Society for Ceramics in Medicine (Bioceramics 20), October 24–26, 2007.
- The mechanical properties and bioactivity of poly(methyl methacrylate)/SiO2-CaO nanocomposite were investigated using dimethyldiethoxysilane (DMDES) and tetraethoxysilane (TEOS), which could produce two and four siloxane linkages, respectively, after a sol-gel reaction. Methyl methacrylate was copolymerized with 3-(trimethoxysilyl)propyl methacrylate and then co-condensed with DIVIDES (specimen D) and TEOS (specimen T), respectively, with calcium nitrate tetrahydrate under acidic conditions. The fracture toughness of specimen D was much improved compared to that of specimen T, whereas its fracture strength, hardness, and apatite-forming ability in simulated body fluid (SBF) were slightly decreased. The improved fracture toughness of specimen D without losing apatite-forming ability was explained by the decrease of siloxane linkage numbers and the introduction of alkyl groups in silica structure because covalently bonded siloxane linkages produce hard and brittle fracture behavior in the nanocomposite while the alkyl groups help to make the silica as linear chain structure. The practical implication of these results is that this new nanocomposite can be applied to the filler materials for bone cement and dental composite resin because of its good bioactivity and improved mechanical properties. (c) 2009 Elsevier Ltd. All rights reserved.
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