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首页> 外文期刊>The Journal of Prosthetic Dentistry >Changes in optical properties of enamel porcelain after repeated external staining.
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Changes in optical properties of enamel porcelain after repeated external staining.

机译：反复外部染色后搪瓷瓷器的光学性能变化。

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STATEMENT OF PROBLEM: After staining a porcelain restoration, increasing the lightness (value) and decreasing the chroma of a restoration is not practically easy to accomplish. PURPOSE: The purpose of this study was to determine the color change of enamel porcelain after repeated external staining procedures over the enamel porcelain surface. Changes in translucency and differences in surface roughness were also measured. MATERIAL AND METHODS: Enamel porcelain (VITA OMEGA 900 Metal Ceramics) disks (1 x 12 mm) of 1 shade (EN2) were prepared, and 1 of 4 types of external stains (VITA Akzent stains) was applied over the specimens and fired. Firing was repeated 3 times after application of the same stains. Color of the specimens before and after stainings was measured with a reflection spectrophotometer. Two-factor repeated-measures analysis of variance with the fixed factors of the stain type and number of staining cycles for the changes in CIE L(*), CIE a(*), CIE b(*), color (DeltaE(*)(ab)), and chroma (DeltaC(*)(ab)) after repeated staining was performed (alpha=.05). Chroma change was calculated as DeltaC(*)(a)=(Deltaa *(2) +Deltab *(2))(1/2). Changes in translucency (translucency parameter and masking effect) and difference in surface roughness (Ra) after the third staining cycle were also determined. RESULTS: Color change after the first staining cycle was perceptible (DeltaE(*)(ab) >2) for 2 of 4 types of stains and was perceptible for all 4 types of stains investigated after the third staining cycle (DeltaE(*)(ab) = 2.36-11.04). Lightness generally increased, and chroma also increased after staining but varied by the type of stains and number of staining cycles. Translucency generally decreased after repeated staining. Surface roughness varied by the type of stain (P < .001). CONCLUSION: Color difference and lightness increased significantly after repeated staining cycles, but chroma change was small after repeated staining cycles. Therefore, repeated staining may be a method to increase the lightness of enamel porcelain.
机译：问题陈述：在对瓷器修复体染色后，要提高修复体的亮度（值）和降低色度实际上并不容易。目的：本研究的目的是确定瓷釉表面重复进行外部染色后，瓷釉的颜色变化。还测量了透明度的变化和表面粗糙度的差异。材料和方法：准备1个阴影（EN2）的搪瓷烤盘（VITA OMEGA 900金属陶瓷）（1 x 12 mm），将4种类型的外部污渍（VITA Akzent污渍）中的1种涂在样品上并烧制。施加相同的污渍后重复烧制3次。用反射分光光度计测量染色前后样品的颜色。对CIE L（*），CIE a（*），CIE b（*），颜色（DeltaE（*）的变化，采用染色类型和染色循环数固定因子的方差的两因素重复测量分析（ab））和重复染色后的色度（DeltaC（*）（ab））（alpha = .05）。色度变化计算为DeltaC（*）（a）=（Deltaa *（2）+ Deltab *（2））（1/2）。还确定了第三次染色循环后半透明性的变化（半透明性参数和掩盖效果）以及表面粗糙度的差异（Ra）。结果：第一个染色周期后的颜色变化对于4种类型的污渍中的2种是可以感知的（DeltaE（*）（ab）> 2），并且在第三次染色周期之后的所有4种类型的污渍（DeltaE（*）（ ab）= 2.36-11.04）。染色后，亮度通常会增加，色度也会增加，但会因染色类型和染色周期数而异。重复染色后，半透明通常会降低。表面粗糙度因污渍类型而异（P <.001）。结论：重复染色循环后色差和亮度明显增加，但重复染色循环后色度变化很小。因此，重复染色可能是增加珐琅瓷器亮度的方法。

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