In order to investigate the effect of nanodiamond （ND） on the mechanical properties of dental composite resins, bisphenol-A-glycidyl dimethacrylate （ Bis-GMA ）, triethylene glycol dime- thacrylate （ TEGDMA）, bar...In order to investigate the effect of nanodiamond （ND） on the mechanical properties of dental composite resins, bisphenol-A-glycidyl dimethacrylate （ Bis-GMA ）, triethylene glycol dime- thacrylate （ TEGDMA）, barium glass （BG） powder, DL-camphoroquinone （CQ） and dimethylamin- oethylmethacrylate （DMAEMA） were mixed as the matrix for the experiments. NDs of three diame- ters （ 100 nm, 220 nm, 500 nm） modified with 3-（trimethoxysilyl） propyl methacrylate （γ-MPS） were added to the mixture separately in 0. 2% to get test samples. The fiexural strength and elastic modulus of these samples and the mixture without ND （as the reference group, RG） were characterized with standard specification tests. Results reveal that the mechanical properties and elastic modulus of resins containing 220 nm ND （ R-220 ） and 500 nm ND （ R-500 ） were significantly different from those of RG. R-500 had the highest flexural strength and elastic modulus （ by average data）, and all of its five specimens were found to have mean flexural strength values greater than the minimum value （80MPa） prescribed by ISO 4049： 2000. Different sizes of diamonds have different effects on mechanical properties of dental composite resins, and the performances of 220 nm and 500 nm diamonds are better than that of 100 nm diamond.展开更多
文摘In order to investigate the effect of nanodiamond （ND） on the mechanical properties of dental composite resins, bisphenol-A-glycidyl dimethacrylate （ Bis-GMA ）, triethylene glycol dime- thacrylate （ TEGDMA）, barium glass （BG） powder, DL-camphoroquinone （CQ） and dimethylamin- oethylmethacrylate （DMAEMA） were mixed as the matrix for the experiments. NDs of three diame- ters （ 100 nm, 220 nm, 500 nm） modified with 3-（trimethoxysilyl） propyl methacrylate （γ-MPS） were added to the mixture separately in 0. 2% to get test samples. The fiexural strength and elastic modulus of these samples and the mixture without ND （as the reference group, RG） were characterized with standard specification tests. Results reveal that the mechanical properties and elastic modulus of resins containing 220 nm ND （ R-220 ） and 500 nm ND （ R-500 ） were significantly different from those of RG. R-500 had the highest flexural strength and elastic modulus （ by average data）, and all of its five specimens were found to have mean flexural strength values greater than the minimum value （80MPa） prescribed by ISO 4049： 2000. Different sizes of diamonds have different effects on mechanical properties of dental composite resins, and the performances of 220 nm and 500 nm diamonds are better than that of 100 nm diamond.
