Prodan Corina Mirela, Gasparik Cristina, Ruiz-López Javier, Dudea Diana
Department of Prosthetic Dentistry and Dental Materials, Iuliu Hațieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania.
Department of Optics, Faculty of Science, University of Granada, Granada, Spain.
J Esthet Restor Dent. 2025 Feb;37(2):533-545. doi: 10.1111/jerd.13305. Epub 2024 Oct 3.
To evaluate the influence of preheating and water storage on color, whiteness, and translucency of one-shaded, group-shaded, and multi-shaded resin-based composites.
A total of 270 samples were fabricated from one-shaded (Omnichroma), group-shaded (Optishade MD), and multi-shaded (Enamel Plus HRI) resin-based composites and divided into six groups: no heating (control) and 1-5 heatings (test) (n = 15). The CIE L*, a*, b*, C*, and h° color coordinates were registered over white, black, and gray backgrounds with a spectrophotometer before and after 24, 72, 144 h water storage. Kruskal-Wallis test was used to evaluate differences in the color coordinates, whiteness index, and translucency parameter (α = 0.05). The Mann-Whitney U test was performed with a Bonferroni correction (p < 0.001) for pairwise comparisons. CIEDE2000 color, whiteness, and translucency differences between groups and subgroups were evaluated using their respective 50%:50% perceptibility and acceptability thresholds.
Preheating influenced color coordinates, whiteness index, and relative translucency parameters (p < 0.001). Although color differences were below the acceptability threshold for all materials, translucency differences were above the acceptability threshold for Omnichroma. Water storage significantly influenced the whiteness index of Optishade MD (p < 0.001).
Preheating had a more considerable effect on the color, whiteness, and translucency of one-shaded resin-based composite, while water storage influenced group-shaded resin-based composite more importantly.
Preheating influences the color, whiteness level, and translucency of the resin-based composites, but the variations remain generally clinically acceptable; however, practitioners should be aware that the modifications in translucency for one-shaded resin-based composites could be more important than for group-shaded and multi-shaded resin-based composites.
评估预热和储水对单色系、组色系和多色系树脂基复合材料的颜色、白度和半透明度的影响。
用单色系（全彩）、组色系（Optishade MD）和多色系（Enamel Plus HRI）树脂基复合材料制作总共270个样本，并分为六组：不加热（对照组）和1 - 5次加热（试验组）（n = 15）。在储水24、72、144小时前后，用分光光度计在白色、黑色和灰色背景上记录CIE L*、a*、b*、C*和h°颜色坐标。采用Kruskal-Wallis检验评估颜色坐标、白度指数和半透明度参数的差异（α = 0.05）。采用经Bonferroni校正（p < 0.001）的Mann-Whitney U检验进行两两比较。使用各自50%:50%的可感知性和可接受性阈值评估组间和亚组间的CIEDE2000颜色、白度和半透明度差异。
预热影响颜色坐标、白度指数和相对半透明度参数（p < 0.001）。尽管所有材料的颜色差异均低于可接受阈值，但全彩的半透明度差异高于可接受阈值。储水显著影响Optishade MD的白度指数（p < 0.001）。
预热对单色系树脂基复合材料的颜色、白度和半透明度影响更大，而储水对组色系树脂基复合材料的影响更为显著。
预热会影响树脂基复合材料的颜色、白度水平和半透明度，但这些变化在临床上通常仍可接受；然而，从业者应意识到，单色系树脂基复合材料的半透明度变化可能比组色系和多色系树脂基复合材料更为重要。
