Wang Xue, Zhang Xiao-hong, Mu Jian-gang, Liu Hong, Li Jing-hua
Department of Prosthodontics, Affiliated Hospital of Medical College, Qingdao University, Qingdao 266003, Shandong Province, China.
Shanghai Kou Qiang Yi Xue. 2006 Dec;15(6):641-4.
To evaluate the effect of different polishing methods on surface roughness and accuracy of cobalt-chromium castings.
Five polishing methods were compared: centrifugal barrel polishing, electrical brightening, grinding, grinding+centrifugal barrel polishing and grinding+electrical brightening. 30 specimens (30 mmx 10 mm x l.5 mm) were divided into 6 groups which were cast and polished for surface roughness test.30 upper complete denture bases were cast and divided into 6 groups. The dimensional accuracy between the posterior border of the upper complete denture and model at five different positions were determined by traveling microscope measuring method respectively before and after polishing. One-way ANOVA with SPSS13.0 was used for statistical analysis.
Specimens polished by grinding+centrifugal barrel got the smoothest surface (P < 0.01) with Ra0.19 microm, compared with Ra3.38 microm before polishing. No significant difference of the posterior border gaps between the cast base and model was found (P > 0.05).
Bases polished by grinding + centrifugal barrel had the smoothest surface. There is no influence of centrifugal barrel polishing on dimensional accuracy of cast upper base.
评估不同抛光方法对钴铬铸件表面粗糙度和精度的影响。
比较了五种抛光方法：离心滚筒抛光、电解抛光、打磨、打磨+离心滚筒抛光和打磨+电解抛光。将30个试件（30mm×10mm×1.5mm）分为6组进行铸造和抛光以进行表面粗糙度测试。铸造30个上颌全口义齿基托并分为6组。在抛光前后，分别通过移动显微镜测量法测定上颌全口义齿后缘与模型在五个不同位置处的尺寸精度。使用SPSS13.0进行单因素方差分析以进行统计分析。
与抛光前的Ra3.38微米相比，经打磨+离心滚筒抛光的试件表面最光滑（P<0.01），Ra为0.19微米。铸造基托与模型之间后缘间隙无显著差异（P>0.05）。
经打磨+离心滚筒抛光的基托表面最光滑。离心滚筒抛光对铸造上颌基托的尺寸精度没有影响。
