Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Effect of coloring agent dryness on zirconia color

치과용 지르코니아 착색제의 건조정도가 지르코니아 색조에 미치는 영향

  • Lee, Joo-Hee (Department of Dental Lab Technology, Daejeon Health Institute of Technology) ;
  • Park, Jin-Young (Institute for Health Science, Korea University) ;
  • Kim, Hae-Jung (Kim&Lee Inc.) ;
  • Moon, Yun Hee (School of Health Sciences, Dankook University) ;
  • Kim, Woong-Chul (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University)
  • Received : 2018.05.03
  • Accepted : 2018.08.03
  • Published : 2018.08.31
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Abstract

One of the most important factor of esthetic prosthesis is the color of the teeth. Zirconia is produced in the process of design, milling, coloring, drying, and sintering. The effect of the drying degree of zirconia colorant on the color tone is examined. For the experiment, a total of 45 zirconia specimens(15 for each) were fabricated by using cad/cam system. The zirconia specimens(L block(LAZOR), Z block(Zircos-E block posterior), A block(AlphaZ)) were then subjected to zirconia sintering in accordance with the manufacturer's instructions, using a chemical coloring agent to Non-drying(0sec), intermediate (10sec), and completely dried (10min) temperature holding times. The color tone was measured using a spectrophotometer. The results were analyzed with a One-way analysis of variance and the Tukey post-hoc test (${\alpha}=.05$) The $L^*$ values of L, A specimens, $a^*$ values of A specimens, and $b^*$ values of Z specimens were not statistically different according to the degree of drying (p>0.05), While the $L^*$ value of Z specimen, $a^*$ value of L, Z specimen, $b^*$ values of L, A specimens were statistically different according to the degree of drying(p <0.05). In conclusion, the drying of zirconia colourants improves zirconia brightness and increases the optical properties of the enamel.

심미 치과보철물의 가장 중요한 요인 중의 하나는 치아의 색상이다. 지르코니아는 디자인, 밀링, 착색, 건조, 소결과정을 거치는데, 이때의 지르코니아 착색제의 건조 정도가 색조에 어떠한 영향을 미치는지 알아보고자 한다. 실험을 위해 캐드캠을 이용하여 지르코니아 블록별(L block(LAZOR), Z block(Zircos-E block posterior), A block(AlphaZ))로 각 15개씩 총 45개의 원형 시편을 제작하였다. 그다음 지르코니아 시편을 화학적 착색제를 이용하여 미건조(0sec), 중간건조(10sec), 완전건조(10min)의 온도유지시간(Temperature dwelling time)을 부여하여 오븐에서 건조한 후 제조회사 지시대로 지르코니아 시편을 소결하였다. 분광광도계를 이용하여 색조를 측정하였다. 치과용 지르코니아 시편의 건조유지시간에 따라 색조의 변화를 비교 분석하기 위해 One-way ANOVA를 시행하고, 사후검정으로 Tukey test를 실시하였다. 지르코니아 $L^*$값은 L, A 시편과 $a^*$값은 A 시편, $b^*$값은 Z 시편의 건조 정도에 따라 통계적으로 차이가 없으나 (p>0.05), $L^*$값은 Z 시편과 $a^*$값은 L, Z 시편, $b^*$값은 L, A 시편이 건조 정도에 따라 통계적으로 차이가 있었다(p<0.05). 결론적으로 착색제의 건조유지시간이 길수록 지르코니아 명도를 밝게 하고, 법랑질의 광학적 특성을 증가시킨다.

Keywords

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