de Bragança Rafaella Mariana Fontes, Leyva Del Rio Diana, Oliveira-Neto Luiz Alves, Johnston William Michael
PhD Candidate, Division of Restorative and Prosthetic Dentistry, College of Dentistry, The Ohio State University, Columbus, OH.
Assistant Professor, Division of Restorative and Prosthetic Dentistry, College of Dentistry, The Ohio State University, Columbus, OH.
J Prosthet Dent. 2024 Sep;132(3):613.e1-613.e8. doi: 10.1016/j.prosdent.2024.06.009. Epub 2024 Jul 8.
Shade selection is a challenge in restorative dentistry. While single-shade composite resins may simplify this process, whether the color mismatch between this composite resin and the substrate is within acceptable levels to ensure successful outcomes is unclear.
The purpose of this in vitro study was to assess the influence of background and surrounding shade, thickness, and proximity to the surrounding on color mismatch when shaded and single-shade composite resins are used in the center of an enamel layer.
Two-layer specimens mimicking dentin (the background) and enamel (the surrounding and center) were prepared. Two shades were used for the background and the surrounding layer (OA1/A1 and OA3/A3). At the Ø3-mm center, 2 single-shade composite resins were placed, Omnichroma (OM) and Admira Fusion x-tra (FU), and also shaded composite resins A1, WE, A3, and C2. For the OA1/A1 background and surrounding, shades A1 and WE served as positive controls, while the A3 and C2 were negative controls. For OA3/A3, these controls were reversed. Two enamel layer thicknesses were evaluated (0.5- and 1.0-mm). Reflectance measurements were made at 0.0, 1.0, 2.0, and 2.5 mm from the center. Color differences were calculated between those at 2.5 mm and at other distances (ΔE ΔE and ΔE). Data analysis employed a 4-way repeated measure ANOVA with Bonferroni corrections for the pair-wise comparisons (α=.05).
Background and surrounding shade, central shade, distance, and thickness affected color mismatch (P<.05). For the OA1/A1 specimens, single-shade color mismatch values were found between both the positive and negative controls (P<.05). For the OA3/A3 specimens, the color mismatch did not differ significantly from that of negative controls (P>.05). No difference was found between ΔE and ΔE, but each was distinct from ΔE. Thickness did not affect the color mismatch of the single-shade composite resins (P<.05).
Single-shade composite resins for enamel replacement showed higher color mismatches compared with positive controls.
在口腔修复学中，色度选择是一项挑战。虽然单色度复合树脂可能会简化这一过程，但这种复合树脂与基底之间的颜色不匹配是否在可接受范围内以确保成功的治疗效果尚不清楚。
本体外研究的目的是评估当在牙釉质层中心使用带色度和单色度复合树脂时，背景和周围色度、厚度以及与周围的距离对颜色不匹配的影响。
制备模拟牙本质（背景）和牙釉质（周围和中心）的两层样本。背景和周围层使用两种色度（OA1/A1和OA3/A3）。在直径3毫米的中心处，放置两种单色度复合树脂，全彩（OM）和Admira Fusion x-tra（FU），以及带色度复合树脂A1、WE、A3和C2。对于OA1/A1背景和周围，色度A1和WE作为阳性对照，而A3和C2为阴性对照。对于OA3/A3，这些对照则相反。评估了两种牙釉质层厚度（0.5毫米和1.0毫米）。在距中心0.0、1.0、2.0和2.5毫米处进行反射率测量。计算2.5毫米处与其他距离处之间的颜色差异（ΔE、ΔE和ΔE）。数据分析采用四因素重复测量方差分析，并进行Bonferroni校正以进行两两比较（α = 0.05）。
背景和周围色度、中心色度、距离和厚度影响颜色不匹配（P < 0.05）。对于OA1/A1样本，在阳性和阴性对照之间均发现单色度颜色不匹配值（P < 0.05）。对于OA3/A3样本，颜色不匹配与阴性对照相比无显著差异（P > 0.05）。ΔE和ΔE之间未发现差异，但它们各自与ΔE不同。厚度不影响单色度复合树脂的颜色不匹配（P < 0.05）。
与阳性对照相比，用于替代牙釉质的单色度复合树脂显示出更高的颜色不匹配。
