금속염화물 착색제 침투가 정방정 지르코니아 다결정체의 색조와 강도 변화에 미치는 영향
Effect of Metal Chloride Coloring Liquids on Color and Strength Changes of Tetragonal Zirconia Polycrystals
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초록
본 연구에서는 1,040oC에서 예비소결한 Y-TZP 시편을크롬 염화물 0.03∼0.08 wt%, 테르븀 염화물 0.03∼0.07 wt%를 함유한 금속염화물 수용액에 3분간 침지하고서 1,450oC에서 2시간 동안 소결하였으며, 이를 금속염화물 침투가 Y-TZP 소결체의 색상, 소결밀도, 굴곡강도 및 미세조직의 변화에 미치는 영향을 조사한 결과, 다음과 같은 결론을 얻었다. 지르코니아 예비소결체에 대한 크롬과 테르븀염화물 침투로 A1, A2 및 A3에 근사한 색조의 재현이 가능하였다. 크롬과 테르븀 염화물을 첨가했을 때 지르코니아의결정립 크기가 증가하였다. Y-TZP 소결체의 2축 굴곡강도는 크롬과 테르븀 염화물 침투에 의해서 유의한 변화를 보이지 않았다(p＞0.05). X-선 회절 분석결과, 크롬과 테르븀염화물의 첨가 여부와 함량에 따른 지르코니아 결정상의 차이점은 관찰되지 않았다. 이상의 결과로 크롬과 테르븀 염화물을 사용하여 지르코니아의 색상을 조절할 수 있음을 확인하였고, 착색된 지르코니아의 색상은 Vita shade guide의색상과 다소 차이가 있었지만 임상에서 이중구조 세라믹 보철물 재작 시 사용 가능할 것으로 생각된다.
Abstract
The purpose of this study was to evaluate the effect of metal chloride infiltration treatment on color and strength changes of the yttria-stabilized tetragonal zirconia polycrystals (Y-TZP). Fifty disc specimens were prepared with a Y-TZP powder (ZPEX; Tosoh, Japan). Thirty different metal chloride solutions containing 0.03∼0.08 wt% chromium and 0.03∼0.07 wt% terbium ions were prepared. Presintered Y-TZP specimens were soaked in metal chloride coloring liquids for 3 minutes and sintered in air at 1,450℃ for 2 hours. The color of the specimens was measured with spectrophotometer and color difference (ΔE *) was obtained based on the CIE L *, a*, b* color coordinate values. To evaluate the effect of metal chloride infiltration strength changes, the biaxial flexural test was performed at crosshead speed 0.5 mm/min. Colors of the sintered Y-TZP showed the colors of Vita shade guide A1, A2 and A3 with the infiltration of chromium and terbium chloride solutions. Density of the sintered Y-TZP increased by the infiltration of chromium and terbium chloride solutions. Bi-axial flexural strength of the sintered Y-TZP did not show statistically significant differences by the infiltration of chromium and terbium chloride solutions (p＞0.05). Chromium and terbium chloride did not affect the crystal phase of zirconia, and all specimens showed tetragonal phase. Accordingly, this study suggests that chromium and terbium chlorides can make colored zirconia while adding in a liquid form. The color of colored zirconia differ from that of vita shade guide but it can use all ceramic restoration as substructure in dental clinic.
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