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KMID : 1035320170440040349
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Korean Society for Dental Materials
2017 Volume.44 No. 4 p.349 ~ p.358
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Surface characteristics of Zirconia Crown by the polishing method
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Kang Myong-Hun
Kong Ji-Hyun
Park Jung-Eun
Kim Tae-Hwan
Jang Jong-Hwa
Bae Tae-Sung
Lee Min-Ho
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Abstract
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This study was conducted to confirm the effect of polishing conditions which are the rotation speed, moving direction and use of a paste including diamond particles on the changes of the scratched zirconia surface using Cera Glrazeⓡ. Eighty-five Yttrium oxide-stabilized zirconium oxide discs with 12 mm in diameter and 1.5 mm in thickness were fabricated. These specimens were divided into 5Groups; Group A, Ba1~4, Bb1~4, Ca1~4, Cb1~4(n=5). The surface of polished specimen was analyzed using X-ray diffraction (XRD), surface roughness test, optical microscope and scanning electron microscope (SEM). In surface roughness test and optical microscope and SEM images, roughness was like this - group A>B, A>C, a>b, 1>2>3>4. In the result of XRD analysis, It was confirmed that the crystal phases on the surfaces of group A, Ba1~3, Bb1~3, Ca1~3, Cb1~3 were changed from tetragonal to monoclinic except group 4. Monoclinic crystals on zirconia surface was eliminated by using the diamond paste during polishing. The polishing direction affected the decrease in the surface roughness had influence on decrease, but rotation speed did not.
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KEYWORD
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3Y-TZP, polishing, XRD, Surface Roughness
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