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首页> 美国卫生研究院文献>The Journal of the Indian Prosthodontic Society >An In Vitro Study on Effect of Ceramic Thickness and Multiple Firings on Colour of Metal Ceramic Restorations
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An In Vitro Study on Effect of Ceramic Thickness and Multiple Firings on Colour of Metal Ceramic Restorations

机译：陶瓷厚度和多次烧成对金属陶瓷修复体颜色影响的体外研究

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Preparation of porcelain restorations that match the natural dentition has been a subject of great concern for many years. An understanding of the process by which the colour and translucency of fixed restorations are planned and obtained so as to replicate the colour of its adjacent teeth is important for achieving an esthetic restoration. This study was done to study the effect of fabrication procedures such as ceramic thickness and number of firing cycles on the colour of metal ceramic restorations. Metal ceramic samples with three different ceramic thicknesses; 0.5, 1 and 1.5 mm (N = 30, n = 10 per group) were fabricated. A3 shade of [VMK 95, VITA Zahnfabrik, Bad Sackingen, Germany] ceramic was used for the fabrication of samples. Samples were subject to multiple firing cycles and colour was measured after 2nd, 3rd, 4th, 6th, 8th and 10th firing cycle. Colour measurement was done objectively using spectrolino (Gretag Macbeth Inc., Germany) spectrophotometer. ‘Repeated measures ANOVA’ test was used for doing statistical analysis. No significant change was noticed in any of the four colour parameters between the baseline reading after second firing uptil the tenth firing for any of the three groups with different ceramic thicknesses. There was a consistent rise in L* or lightness of colour as the thickness of ceramic increased. Between group I and group III there was a consistent shift of a* axis towards the blue green side and there was a consistent shift in b* axis towards purple–blue with an increase in ceramic thickness. It was observed that there was a change in ΔE with a change in ceramic thickness. There was a change of about two units between group I and group II and a change of about one unit between group II and group III. Change in ΔE between group I and group III was the most significant, being about three units. It was concluded from the study that multiple firing cycles during fabrication of metal ceramic restorations do not have any effect on colour while colour varies with change in ceramic thickness.
机译：多年来，与自然牙质相匹配的瓷器修复物的制备一直是备受关注的问题。计划和获得固定修复体的颜色和半透明以复制其相邻牙齿的颜色的过程的理解对于实现美学修复体很重要。进行这项研究是为了研究制造程序（例如陶瓷厚度和烧成次数）对金属陶瓷修复体颜色的影响。具有三种不同陶瓷厚度的金属陶瓷样品；分别制造0.5、1和1.5毫米（每组N = 30，n = 10）。 [VMK 95，德国巴特萨金根的VITA Zahnfabrik的] A3阴影用于样品的制造。样品经历多个焙烧循环，并在第二，第三，第四，第六，第八和第十次焙烧循环后测量颜色。使用分光光度计（Gretag Macbeth Inc.，德国）分光光度计客观地进行颜色测量。 “重复测量方差分析”测试用于进行统计分析。对于具有不同陶瓷厚度的三组中的任何一组，在第二次焙烧后至第十次焙烧之间，基线读数之间的四个颜色参数中的任何一个都没有发现显着变化。随着陶瓷厚度的增加，L *或颜色的亮度持续增加。在第一组和第三组之间，随着陶瓷厚度的增加，a *轴向蓝绿色一侧持续移动，b *轴向紫蓝色持续移动。观察到随着陶瓷厚度的变化ΔE也发生变化。第一组和第二组之间约有两个单元的变化，第二组和第三组之间约有一个单元的变化。 I组和III组之间的​​ΔE变化最为显着，约为3个单位。从研究得出的结论是，在金属陶瓷修复体的制造过程中，多次烧成对颜色没有任何影响，而颜色随陶瓷厚度的变化而变化。

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