반복 소성이 지르코니아 전부도재관의 색조에 미치는 영향
The effect of repeated firings on the color of zirconia-based all-ceramic system
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연구 목적: 각각 다른 방법으로 색조를 부여한 세 가지 지르코니아 전부도재관에서 반복소성이 전부도재관의 색조에 미치는 영향을 비교, 관찰하였다. 연구 재료 및 방법: 지르코니아 코어를 세가지 방법으로 착색(KW군: Masking liner를 사용하여 하부 코어색 차단, KI군: 지르코니아 코어를 금속 산화물 용액에 침전시켜 착색, NM군: 지르코니아 코어를 고온에서 소결하기 전에 금속산화물과 혼합하여 착색)하여 원반형 시편을 제작하였다. 지르코니아 코어 상방에 A3 색조의 상아질 도재를 소성하고 3, 5, 7회 반복소성 후 L*a*b* 값을 측정하여 비교하고 다른 두 가지 색의 3차원 공간에서의 거리를 나타내는 색차방정식을 이용하여 분석하였다. 측정된 결과는 반복측정 (repeated-measures ANOVA) 분석법과 Tukey 다중범위 검증법을 사용하여 소성횟수에 따른 색조변화를 유의수준5%에서 검정하였다. 결과: 1. 모든 실험군에서 반복소성에 따른 L*a*b*값의 변화가 관찰되었다 (P< .001). 2. 반복소성으로 L*값과 a*값 (KI군제외)은 감소하고 b*값 은 증가하는 경향을 보였다. 3. ΔE값이 1이상 나타난 반복소성횟수는KW군과 KI군은 3회 그리고NM군은 7회였다. 4. 7회 반복소성 후 ΔE값은 KI군 (ΔE = 2.26), KW군 (ΔE = 1.47) 그리고NM군 (ΔE =1.08) 순으로 높게 나타났다 (P< .001). 결론: 반복소성이 지르코니아 코어 색조를 부여방법에 따라 전부도재관의 색조에 미치는 영향을 끼쳤다.
Abstract
PURPOSE: The aim of this study was to evaluate the effect of repeated firings on the color of zirconia restoration with different shading method. MATERIALS AND METHODS: Three different types of zirconia frameworks (adding metallic pigments to the initial zirconia powder before sintering (Group NM), dipping the milled frameworks in dissolved coloring agents (Group KI), or application of liner material to the sintered white frameworks (Group KW) were used to support A3 shade dentin porcelain. Repeated firings (3, 5, or 7) were performed, color differences among ceramic specimens were measured using a colorimeter. Repeated measurements analysis of variance (ANOVA) was used to analyze the data for significant difference. The Tukey Honestly Significant Different (HSD) test was used to perform multiple comparisons (α= .05). RESULTS: 1. L*a*b* values of the ceramic systems were affected by the number of firings (1, 3, 5 or 7 firings) (P < .001) and shading methods (P < .001). 2. As the number of firings increased, the L* (for all groups) and a* value (for KW and NM groups) decreased and the b* value(for all groups) increased. 3. The mean color differences caused by repeated firings were perceptible (ΔE > 1) for group KW and KI fired after 3 times, except for group NM fired after 7 times. 4. In order of decreasing ΔE value fired after 7 times, the values were group KI(ΔE = 2.26) > group KW (ΔE = 1.47) > group NM (ΔE = 1.08) (P < .001). CONCLUSION: Repeated firings influenced the color of the zirconium-oxide all-ceramic specimens with different shading methods.
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