牙科氧化铝基陶瓷纳米硅涂层表面改性的研究

目的 探讨溶胶凝胶法制备纳米硅涂层的工艺,评价涂层对牙科氧化铝基陶瓷润湿性的改变,为提高其与树脂的粘接提供实验基础。方法 采用溶胶凝胶法在喷砂的In-Ceram氧化铝基片表面制备硅涂层;原子力显微镜(AFM)观察热处理后涂层凝胶的微观形态;红外光谱(IR)分析热处理前后的凝胶;计算瓷片抛光组、喷砂组、喷砂加纳米硅涂层组油酸接触角的改变。结果 在In-Ceram氧化铝基片表面置得纳米硅涂层,AFM观测显示热处理使纳米氧化硅粒子的直径长大;IR分析可知凝胶经热处理后Si-OH弯曲振动吸收峰消失;喷砂和喷砂加纳米硅涂层组油酸的接触角均小于抛光组(P=0.000,P=0.000),喷砂加纳米硅硅涂层组的接触角最小(P=0.000,P=0.003)。结论 溶胶凝胶法可以在牙科氧化铝基陶瓷表面制备纳米硅涂层;热处理加强了涂层凝胶微结构中的Si-O-Si网络,但会使纳米粒子部分团聚;喷砂能够提高氧化铝基陶瓷的润湿性,纳米硅涂层使润湿性进一步增强。

Surface Modification of Dental Alumina Ceramic with Silica Coating

Objective To make silica coating through sol-gel process,and to evaluate the wettability of dental alumina ceramic with or without coating.Methods Silica coating was prepared with colloidal silica sol on In-Ceram alumina ceramic surface which had been treated with air particle abrasion.Coating gel after heat treatment was observed with atomic force microscope(AFM),and was analyzed by infrared spectrum(IR)with gel without sintered as control.Contact angles of oleic acid to be finished,sandblasted and coated ceramic surface of were measured.Results AFM pictures showed that some parts of nano-particles in coating gel conglomerated after heat treatment.It can be seen from the IR picture that bending vibration absorption kurtosis of Si-OH also vanished af-ter heat treatment.Among contact angles of three treated surface,the ones on polished surface were the biggest(P= 0.000,P=0.000),and sandblasting silica coating surface the smallest(P=0.000,P=0.003).Conclusion Silica coating can be made with sol-gel process successfully.Heat treatment may reinforce Si-O-Si net structure of coating gel.Wettability of dental alumina ceramic with silica coating is higher than with sandblasting and polishing.