试论口腔科氧化锆陶瓷材料的低温时效性能

Study on Low Temperature Aging Properties of Oral Zirconia Ceramic Materials

目的:研究口腔科陶瓷氧化锆材料的低温老化性能,探讨影响其时效性能的因素。方法:将氧化锆陶瓷坯体在4种烧结温度下保温2个小时,分为A组(1350℃~2h)、B组(1400℃~2h)、C组(1450℃~2h)及D组(1500℃~2h),分别在140℃的环境中老化,时间分别为0h、5h、24h和96h。采用扫描电子显微镜观察样品,测量氧化锆材料的抗弯曲强度,采用X射线衍射仪分析时效后材料的晶相结构。结果采用SPSS 18.0统计软件进行分析,统计方法单因素方差分析和Iukeys检验。结果D组晶粒尺寸较大,表面可见有较大的颗粒形成。各组组内弯曲强度比较,A组、B组差异无统计学意义(P>0.05),C组及D组差异有统计学意义(P<0.05),D组强度下降幅度最大。结论:材料晶粒尺寸伴随着烧结温度的升高以及时效时间的延长而增大。低温时效可以引起陶瓷材料表面单斜相的含量增加,引起材料显微结构的改变;随着时间的延长口腔科氧化锆陶瓷材料的弯曲强度降低,口腔科氧化锆陶瓷材料的低温时效效应具有时间依赖性。

Objective:To study the low temperature aging properties of dental ceramics zirconia and to explore the factors aff ecting its aging properties.Methods:Zirconia ceramic body was burned in 4 kindsGroup A(1350℃~2h),group B(1400℃~2h),group C(1450℃~2h)and group D(1500℃~2h)were divided into groups at 140℃,respectivelyThe aging time in the environment is 0h,5h,24h and 96h respectively.The bending strength of zirconia material was measured by scanning electron microscope(SEM)The crystal phase structure of the aged material was analyzed by radiometer.Results SPSS 18.0 statistical software was used for analysis,statistical methods were one-way ANOVA and Tukeys test.Results D crystal formationThe particle size is large,and large particles can be seen on the surface.There was no signifi cant diff erence in bending strength between groups A and B(P>0.05),but there was a signifi cant diff erence between groups C and DStatistical signifi cance(P<0.05),the intensity of group D decreased the most.Conclusion:The grain size increases with the increase of sintering temperature and aging time.Low temperature aging can increase the content of monoclinic phase on the surface of ceramic materials.The microstructure of the material is changed.With the extension of time,the bending strength of dental zirconia ceramic materials decreases,and the low temperature aging eff ect of dental zirconia ceramic materials has a time depende.