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目的:体外检测掺锶纳米羟基磷灰石作为填料与釉质粘结剂复合后的粘结强度和再矿化作用。方法:将掺锶纳米羟基磷灰石按不同质量比(0%、8%、10%、12%、14%)、纳米羟基磷灰石按一定质量比(10%)与京津釉质粘结剂复合后分别粘结托槽,电子万能测试机检测托槽粘结强度,并计算ARI记分,对结果进行统计学处理与分析。用扫描电镜观察12%掺锶纳米羟基磷灰石粘结剂、10%纳米羟基磷灰石粘结剂和0%粘结剂对托槽周围脱矿釉质的再矿化情况。结果:12%掺锶纳米羟基磷灰石粘结剂剪切强度和拉伸强度均高于其他各组,与10%纳米羟基磷灰石粘结剂、0%粘结剂有显著差异(P<0.05);各组ARI记分之间无显著差异(P>0.05);12%掺锶纳米羟基磷灰石粘结剂再矿化效果优于其他各组。结论:12%掺锶纳米羟基磷灰石釉质粘结剂较其他各组具有良好的机械性和再矿化作用。
OBJECTIVE: To investigate the bonding strength and remineralization of strontium-doped nano-hydroxyapatite (HEMA) as filler and enamel binder in vitro. Methods: Nano-hydroxyapatite-doped nano-hydroxyapatite was bonded with Beijing-Tianjin enamel by mass ratio (0%, 8%, 10%, 12%, 14% After compounding, the brackets were respectively bonded, and the electronic universal testing machine was used to detect the bond strength of the brackets. ARI scores were calculated and the results were statistically processed and analyzed. Scanning electron microscopy was used to observe the remineralization of demineralized enamel around brackets with 12% strontium-doped nano-hydroxyapatite binder, 10% nano-hydroxyapatite binder and 0% binder. Results: The shear strength and tensile strength of 12% strontium-doped nano-hydroxyapatite binder were higher than those of the other groups, which were significantly different from that of 10% nano-hydroxyapatite binder and 0% binder (P <0.05). There was no significant difference between each group (P> 0.05). The remineralization effect of 12% strontium-doped nano-hydroxyapatite binder was better than other groups. Conclusion: 12% strontium-doped nano-hydroxyapatite enamel binder has good mechanical and remineralization effects than other groups.