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《West China Journal of Stomatology》 2016-04
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Effects of dentin demineralization and bond-strength properties of bioactive glass containing resin adhesive

Wang Yu;Gong Ling;Ji Yan;Zheng Lichun;Chen Song;Dept. of Preventive Dentistry,Nanjing Stomatological Hospital,Medical School of Nanjing University;  
Objective This study investigated the shear bond strength and the ability of resin adhesive containing different amounts of bioactive glass(BG) to prevent dentin demineralization. Methods BG bonds at 30%, 40%, and 50% concentrations comprised a mixture of coupling agents modifying BG and Single Bond 2. Forty permanent premolars extracted for orthodontic treatment were randomly divided into four groups, namely, control group(BG-free), 30% BG group, 40% BG group, and 50% BG group. Composite resin and dentin were prepared into bonding specimens by using respective adhesives and then immersed in artificial saliva at p H 4 for 1 week. Changes in the p H values of the solution were measured every 24 h. The microtensile bond strength(TBS) of each specimen was examined after immersion in distilled water at 37 °C for 24 h. Results The TBS values of the control group, 30% BG group, 40% BG group, and 50% BG group were(27.76±0.29),(27.05±0.58),(26.95±0.69), and(25.12±0.24) MPa, respectively. The TBS of the control group was not significantly different from that of the 30% BG group(P=0.06) but significantly higher than that of the 40% BG and 50% BG groups(P=0.04 and P=0.00, respectively). In addition, TBS was significantly higher in the 30% BG and 40% BG groups than in the 50% BG group(P=0.00 and P=0.00, respectively). The p H values of the solution increased with increasing BG content. Conclusion BG bonds are useful in the prevention of dentin demineralization. However, in this study, the 30% BG group did not affect the shortterm bond strength. The 50% BG group displayed the optimum ability to inhibit demineralization but showed the worst bond strength.
【Fund】: 南京市医学科技发展项目(YKK14111)~~
【CateGory Index】: R783.1
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