Objective To study the mechanical properties of strontium-doped nano-bioactive glass (SrNBG) modified composite resin by synthesizing SrNBG and adding it to composite resin for modification.
Methods Nano-bioactive glass (NBG) and SrNBG with three different strontium doping ratios were synthesized by sol-gel doylamine method. The most appropriate strontium doping ratios were obtained by hydroxyapatite (HA) activity test in vitro. Then, the inorganic fillers in composite resin were replaced by 5%, 10% and 15% of mass ratio respectively, and three modified composite resin were obtained, and were selected as experimental group 1, experimental group 2 and experimental group 3. Composite resin without SrNBG replacement was used as control group. The mechanical properties of composite resin were measured by electronic universal testing machine.
Results SrNBG synthesized by sol-gel dodecamine method had regular spherical particles with a diameter of about 200 nm and good dispersion. When the SrNBG doping ratios were 5 mol% and 10 mol%, both SrNBG showed good biological activity. In the three experimental groups of SrNBG modified composite resin, when the replacement mass ratios of SrNBG were 5% and 10%, there were no statistical differences in the three mechanical properties compared with the control group (P>0.05). When the replacement mass ratio of SrNBG was 15%, diametral tensile strength (DTS) and flexural strength (FS) were significantly lower than those of the control group (P < 0.05).
Conclusion SrNBG synthesized by sol-gel dodecylamine method has uniform particle size, good dispersity and excellent biological activity. When the replacement mass ratio of SrNBG is 10%, the mechanical properties of the modified composite resin are not affected.
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