着色剂氧化铈及氧化铒对牙科氧化锆陶瓷颜色及性能的影响

Effect of cerium oxide and erbium oxide as colorants on the chromaticity and mechanical properties of dental zirconia ceramic

背景:有研究提出在氧化锆中添加稀土氧化物,可以在一定程度上改变氧化锆自身颜色,以期满足口腔临床要求,达到美观。目的:对添加稀土氧化物氧化锆的色度值和机械性能进行评价。方法:用ShadeEye电脑比色仪测试件的L*a*b*值,用X射线衍射仪(D/max-RB)分析材料的晶相结构,在EZ-100万能实验机上测试其三点弯曲强度。使用扫描电镜观察试样弯曲断口显微形态。结果与结论:①烧结后所形成的氧化锆试件材料主晶相结构为四方相氧化锆,未见第2种晶相结构。②氧化铈与氧化锆混合呈淡黄色;氧化铒与氧化锆混合呈浅粉红色,并随着剂量的增加,颜色随之加深;二者混合试件使氧化锆呈浅桔黄色,并随着剂量的增加,颜色随之加深。③单独添加二氧化铈后,材料的抗弯强度呈下降趋势,单独添加氧化铒后,材料的抗弯强度呈下降趋势,二氧化铈和氧化铒混合试件抗弯强度随二氧化铈和氧化铒含量的增加而降低,单独添加二氧化铈仅少量降低了抗弯强度,当加入氧化铒后对材料强度降低的影响更加明显。表明,稀土氧化物与氧化锆混合可以改变氧化锆自身颜色,并且具有一定的抗弯性。

BACKGROUND： Some studies have proposed adding rare earth oxides into zirconia, to change the color of zirconia oxide in order to meet the clinical requirements of the mouth for beautility. OBJECTIVE： To evaluate the chromatic value and mechanical properties of zirconia added with rare earth oxides. METHODS： ShadeEye computer colorimetric meter was used to test the L ＊ a ＊ b ＊ values of the specimens. X-ray diffraction （D/Max-RB） was used to analyze the crystalline structure of materials. Using EZ-100 universal experiment machine, three-point bending strength was measured. The bending fracture microscopic form was observed under scanning electron microscope. RESULTS AND CONCLUSION： ①The main crystalline structure of sintered ziconia specimens was tetragonal zirconia, and there was no another crystalline structure. ②The mixture of cerium oxide and ziconia presented with pale yellow; the mixture of erbium oxide and ziconia presented with pale pink, and the color deepened with the dose increase. Two hybrid specimens made ziconia presenting orange, and with the color deepened with the dose increase. ③The flexural strength of the materials added with cerium dioxide or erbium oxide alone was in downtrend. The flexural strength of the specimens added with the mixture of cerium dioxide and erbium oxide was decreased with the increase of cerium dioxide and erbium oxide. However, the single cerium dioxide only led to a small decrease in the flexural strength, and erbium oxide significantly increased the decrease of flexural strength. The color of zironia mixed with rare earth oxides can be changed, and a certain flexural resistance appears.