纳米无定形磷酸钙对渗透树脂显微硬度及抛光性能的影响

Effects of Amorphous Calcium Phosphate on Microhardness and Polishing Performance of Resin Infiltrant

目的:探讨渗透树脂中加入纳米无定形磷酸钙后对树脂显微硬度及抛光性能的影响。方法:通过脱矿液建立人工龋模型,分别使用渗透树脂及加入纳米无定形磷酸钙的渗透树脂对龋模型进行渗透,使用显微硬度测试仪计算努氏硬度,利用扫描电子显微镜观察釉质抛光表面探究无定形磷酸钙加入渗透树脂后对树脂显微硬度及抛光性能的影响。结果:显微硬度测试后发现,渗透树脂组(C组)与脱矿组(B组)相比,显微硬度提高(P<0.05),但较正常釉质组(A组),硬度值存在统计学差异(P<0.05),纳米无定型磷酸钙渗透树脂组(D组)与正常釉质组(A组)相比,无统计学差异。扫描电镜观察显示,渗透树脂组(C组)及纳米无定形磷酸钙渗透树脂组(D组)经过相同步骤的抛光后,渗透树脂组(C组)表面光滑,孔隙小而少,有少量细滑痕,纳米无定形磷酸钙渗透树脂组(D组)表面不规整,孔隙较大,较C组显粗糙。结论:渗透树脂虽然可以较好恢复脱矿釉质表面的显微硬度,但与正常釉质存在差异,纳米无定形磷酸钙的加入,可以较好弥补渗透树脂这一缺点,但是会影响树脂的抛光性能。

Objective：To investigate the effects of amorphous calcium phosphate on microhardness and polishing performance of resin infiltrant.Methods：Artificial model of dentin caries lesion was established by demineralization fluid treating on the enamel.The specimens were infiltrated by resin infiltrant or resin infiltration mixed with amorphous calcium phosphate agent.Microhardness was investigated by the microhardness tester and the polishing performance was investigated by scanning electron microscopy.Results：The microhardness of resin infiltration group was higher than that of demineralized group（P〈0.05）,but lower than that of normal enamel group（P〈0.05）.There were no statistical differences between the nano amorphous calcium phosphate group and the normal enamel group.In the resin infiltration group,the enamel was smoother with smaller amount of slide mark and smaller pores on the surface in resin infiltration group observed by scanning electron microscope.The surface was rougher with big pores in the nano amorphous calcium phosphate group.Conclusion：Resin infiltration can improve the microhardness of demineralized enamel surface.The nano amorphous calcium phosphate mixed with the resin infiltration can improve the microhardness but decrease the polishing performance.