This study evaluated the influence of 120 autoclave sterilization cycles on the color stability of two commercial shade guides (Vita Classical and Vita System 3D-Master). The specimens were evaluated by spectrophotometer before and after the sterilization cycles. The color was described using the three-dimensional CIELab system. The statistical analysis was performed in three chromaticity coordinates, before and after sterilization cycles, using the paired samples t test. All specimens became darker after autoclave sterilization cycles. However, specimens of Vita Classical became redder, while those of the Vita System 3D-Master became more yellow. Repeated cycles of autoclave sterilization caused statistically significant changes in the color coordinates of the two shade guides. However, these differences are considered clinically acceptable.
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机译：这项研究评估了120个高压灭菌器灭菌周期对两种商用遮光罩（Vita Classical和Vita System 3D-Master）的颜色稳定性的影响。在灭菌循环之前和之后，通过分光光度计评估样品。使用三维CIELab系统描述了颜色。使用配对样本t检验，在灭菌周期之前和之后的三个色度坐标中进行统计分析。高压灭菌后，所有样品均变黑。但是，Vita Classical的标本变红，而Vita System 3D-Master的标本变黄。高压灭菌器的重复循环在统计上显着改变了两个遮光罩的颜色坐标。但是，这些差异被认为是临床可接受的。
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