改良液式冲蚀对3Y-TZP氧化锆基底与饰面瓷结合强度的影响

目的:探讨采用改良液式冲蚀方式对3Y-TZP氧化锆基底表面进行冲蚀后,对其与饰面瓷间结合强度的影响.方法:制作8 mm×8 mm×3 mm(±0.02)]氧化锆试件块174个,根据不同尺寸的刚玉磨粒、不同的喷砂压强、不同的喷砂时间,采用传统喷砂方式进行分组处理(实验组),在氧化锆处理面上饰面瓷.表面未做处理的氧化锆试件直接上饰面瓷作为对照组,应用电子万能测力计检测各组试件与饰面瓷间的最大剪切力,计算剪切强度.分别用传统干式喷砂、改良液式冲蚀方式在相同条件下(150 μm,0.6 MPa,30 s)处理氧化锆试件块,用扫描电镜下观察处理面,再上饰面瓷,计算剪切强度,与对照组进行组间比较.采用SPSS17.0软件包对数据进行统计学分析.结果:采用传统干式喷砂方式,在0.4 MPa压强作用下,以110 μm A12O3喷砂粉喷砂20 s时,氧化锆与饰面瓷之间的剪切强度最大,显著大于对照组(P＜0.05);改良液式冲蚀组饰面瓷的结合强度显著大于传统干式喷砂处理组及对照组(P＜0.01).扫描电镜下可见,采用改良液式冲蚀的试件表面呈现均匀的粗糙面:采用传统干式喷砂处理的试件表面呈现不均匀的粗糙面,部分位置可见微裂纹.结论:对3Y-TZP氧化锆表面喷砂,能够增强其与饰面瓷间的结合强度;改良液式冲蚀比传统干式喷砂更适用于3Y-TZP氧化锆的表面处理.

Evaluation of the effect of modified wet particle erosion on bond strength between 3Y-TZP zirconia framework and veneering porcelain

PURPOSE:To evaluate the effect of bond strength between 3mo1％ yttrium-stabilized tetragonal zirconium polycrystal (3Y-TZP) zirconia framework after modified wet particle erosion and veneering porcelain.METHODS:A total of 174 8 mm× 8 mm× 3 mm (±0.02)] specimens were prepared and then randomly divided into different groups according to different particle size,sandblasting pressure,sandblasting time through conventional sandblasting (experimental groups);specimens in the control group were not sandblasted.The bond strength between 3Y-TZP zirconia framework and veneering porcelain was measured using a universal testing machine.Statistical analysis was performed using SPSS17.0 software package.The bond strength of specimens treated by two methods-conventional sandblasting and modified wet particle erosion under the same condition (150 μm,0.6 MPa,30 s) were acquired,while the surface was analyzed microscopically before the specimens were veneered with the veneering ceramic under scanning electronic microscope (SEM).RESULTS:The bond strength of conventional sandblasting group under the condition (110 μm,0.4 MPa,30 s) was maximal,and significantly higher than the control group (P＜0.05).The bond strength of modified wet particle erosion group was significantly higher than the conventional sandblasting group and control group (P＜0.01);SEM showed that the surface of specimen with modified wet particle erosion was homogeneously rough;the surface specimen with conventional sandblasting was heterogeneously rough,some microcracks were seen in some areas.CONCLUSIONS:Sandblasting can slightly enhance the bond strength between 3Y-TZP zirconia framework and veneering porcelain,modified wet particle erosion is recommended for 3Y-TZP zirconia framework surface treatment.