Experimental Research on Grinding Surface-Quality of Dental Zirconia  

作　　者：雷小宝 谢峰 廖文和 郑侃 

机构地区：[1]College of Electrical Engineering and Automation,Anhui University [2]College of Mechanical Engineering,Nanjing University of Science and Technology [3]College of Mechanical-Electrical Engineering,Nanjing University of Aeronautics and Astronautics

出　　处：《Journal of Donghua University(English Edition)》2016年第1期72-79,共8页东华大学学报（英文版）

基　　金：National Natural Science Foundation of China(No.51305206);Natural Science Foundation of Anhui Province,China(No.1308085QE93);Planned Projects for Postdoctoral Research Funds of Jiangsu Province,China(No.1401024C)

摘　　要：The properties and cutting performance of Y_2O_3-stabilized tetragonal zirconia polycrystal( Y-TZP) used widely for dental restoration have been introduced. The surface roughness of denture made by the ceramics plays an important role in product quality. In order to enhance the surface quality of denture processing,the effect of grinding parameters such as spindle speed,feed rate and the depth of cut with different levels on denture surface roughness were deeply studied to look for reasonable grinding parameters. The experiment was arranged in the orthogonal method. A new dental bur used only for dentistry was employed to carry out the experiment in a high accuracy machining center which was developed by Nanjing University of Aeronautics and Astronautics. The experimental results demonstrated that the depth of cut was the major parameter on surface roughness. With scanning electron microscope( SEM),it was found that the ceramics debris and its surfaces damage were mainly affected by depth of cut. The surface formation mechanism of zirconia ceramics was revealed by the morphology of machined surface. The topographies of the grinded ceramics surfaces demonstrated that zirconia ceramics was removed by its brittle fracture and plastic deformation. The plastic deformation region at grinded ceramic surface was larger with the smaller grinding depth.Finally, an example for grinding molar crown using zirconia ceramics was provided. After processing,the surface morphology of the molar crown was measured. The results showed that its quality was high and met the requirements of dental restoration. The research results of this paper provide useful and theoretical basis for denture processing.The properties and cutting performance of Y_2O_3-stabilized tetragonal zirconia polycrystal（ Y-TZP） used widely for dental restoration have been introduced. The surface roughness of denture made by the ceramics plays an important role in product quality. In order to enhance the surface quality of denture processing,the effect of grinding parameters such as spindle speed,feed rate and the depth of cut with different levels on denture surface roughness were deeply studied to look for reasonable grinding parameters. The experiment was arranged in the orthogonal method. A new dental bur used only for dentistry was employed to carry out the experiment in a high accuracy machining center which was developed by Nanjing University of Aeronautics and Astronautics. The experimental results demonstrated that the depth of cut was the major parameter on surface roughness. With scanning electron microscope（ SEM）,it was found that the ceramics debris and its surfaces damage were mainly affected by depth of cut. The surface formation mechanism of zirconia ceramics was revealed by the morphology of machined surface. The topographies of the grinded ceramics surfaces demonstrated that zirconia ceramics was removed by its brittle fracture and plastic deformation. The plastic deformation region at grinded ceramic surface was larger with the smaller grinding depth.Finally, an example for grinding molar crown using zirconia ceramics was provided. After processing,the surface morphology of the molar crown was measured. The results showed that its quality was high and met the requirements of dental restoration. The research results of this paper provide useful and theoretical basis for denture processing.

关 键 词：zirconium ceramics grinding parameters surface roughness surface morphology molar crown 

分 类 号：TH161[机械工程—机械制造及自动化] R783[医药卫生—口腔医学]