2种方法处理后纳米氧化钛对硅橡胶赝复体遮色性能影响

Effect of nano-TiO_2 after two treatments on the masking ability of silicone rubber prosthesis

目的研究两种处理方法下纳米氧化钛对硅橡胶试件遮色能力的影响,寻找适合于口腔硅橡胶赝复体遮色剂的处理方法,为临床口腔颌面部赝复体的选色、配色提供理论依据。方法用分光光度计分别在黑(L=22.0,a=-1.0,b=-6.2)、白(L=92.7,a=-0.9,b=-2.0)色背景下测量不同处理方法下的纳米TiO2硅橡胶试件的颜色参数L、a、b。根据公式ΔE=[(ΔL)2+(Δa)2+(Δb)2]1/2计算在黑、白背景下的色差值,即表示该遮色剂的遮色能力。结果添加2种处理方法后的纳米TiO2质量分数小时,色差值没有明显差别,但随着添加质量分数的增加,硅铝包覆的纳米TiO2的色差值明显高于硅烷偶联剂处理的纳米TiO2。结论硅铝包覆处理纳米TiO2的分散性能明显优于硅烷偶联剂处理。两种方法处理后的纳米TiO2在添加质量分数较小时,遮色能力没有明显差别,但随着添加纳米TiO2质量分数的增加,硅烷偶联剂处理的纳米TiO2的遮色能力明显优于硅铝包覆处理。

Objective To study the effect of nano TiO2 on the masking ability of silicone rubber prosthesis after two different treat- ments to find the proper treatment suitable for the oral silicon rubber prosthesis masking agent and to offer theoretical basis for clinical selection and colourity of prosthesis in maxillofacial region. Methods Spectrophotometer was used to meter the color parameter L,a,b of TiO2 nano silicon rubber specimens treated in different ways respectively under black and white backgrounds （L = 22.0,a = - 1.0, b= -6.2）,white （L=92.7,a= -0.9,b= -2.0）.According to the formula △E= [（△L ）2 ＋ （△a）2 ＋ △b）2]1/2,the value of chromatism under black and white backgrounds was calculated,which showed the masking ability of the masking agent. Results There was no significant difference in the value of chromatism as the proportion fraction of nano TiO2 was small,but with the proportion frac- tion increasing,the value of chromatism of nano TiO2 with cladding silicone and aluminium was higher than that of the test pieces of the other treatment. Conclusions The dispersion property of nano TiO2 treated with silicone and aluminium is better than that treated with silane coupling agent. After two treatments,there is no obvious difference in the masking ability as the proportion fraction is small but with proportion fraction increasing,masking ability of nano TiO2 treated with silane coupling agent is much better.