Assistant Professor, Department of Prosthodontics, Abant Izzet Baysal University, Bolu, Turkey.
Associate Professor, Department of Prosthodontics, Karadeniz Technical University, Trabzon, Turkey.
J Prosthet Dent. 2018 Jul;120(1):107-113. doi: 10.1016/j.prosdent.2017.09.019. Epub 2018 Jan 6.
Esthetic computer-aided design and computer-aided manufacturing (CAD-CAM) materials have various chemical compositions and can be prepared by using different finishing and polishing procedures. Their optical properties may change over time, depending on these factors. However, information about their stain resistance is still scarce.
The purpose of this in vitro study was to evaluate the optical properties of esthetic CAD-CAM materials after different finishing and polishing procedures and ultraviolet (UV) aging.
Lava Ultimate, Cerasmart, Vita Enamic, Vita Suprinity, and Vita Mark II materials were used. A total of 150 specimens (14×12×1 mm) were prepared (n=10). A spectrophotometer was used to measure color parameters after different finishing and polishing procedures (control, manual polishing, glazing) and ultraviolet (UV) aging. Lightness (L*), green-red (a*), blue-yellow (b*), chroma (Ch), and hue (h) parameters were recorded, and change in lightness (ΔE*) values were calculated. Statistical analyses were performed with 2-way ANOVA, the Fisher least significant difference test, and the paired samples t test (α=.05).
Significant interactions were noted between the aging conditions, material type, and finishing and polishing procedures for all evaluated parameters (P<.001). Vita Suprinity and Vita Mark II glazing groups resulted in significantly higher L* values (P<.05) after the first color measurements. The b* and C values of Vita Suprinity were higher than for other materials (P<.05). The highest ΔE* value was observed in the Lava Ultimate-glazing group (ΔE*=22.7) and the lowest in the Vita Mark II-control group (ΔE*=0.86).
The optical properties of CAD-CAM materials can be affected by the material type and the applied surface finishing and polishing procedure. Manual polishing seems to be a better choice for Lava Ultimate and Cerasmart and glazing for Vita Enamic. For ceramic materials, manual polishing or glazing can be recommended in terms of color stability.
美学计算机辅助设计和计算机辅助制造 (CAD-CAM) 材料具有各种化学成分，并可通过使用不同的精整和抛光程序来制备。它们的光学性质可能会随时间变化，这取决于这些因素。但是，关于它们的抗污性的信息仍然很少。
本体外研究的目的是评估不同精整和抛光程序以及紫外线 (UV) 老化后美学 CAD-CAM 材料的光学性质。
使用 Lava Ultimate、Cerasmart、Vita Enamic、Vita Suprinity 和 Vita Mark II 材料。共制备 150 个试件（14×12×1mm）（n=10）。使用分光光度计在不同的精整和抛光程序（对照、手动抛光、上釉）和紫外线 (UV) 老化后测量颜色参数。记录明度 (L*)、绿-红 (a*)、蓝-黄 (b*)、彩度 (Ch) 和色调 (h) 参数，并计算明度变化值 (ΔE*)。采用 2 因素方差分析、Fisher 最小显著差异检验和配对样本 t 检验进行统计分析 (α=.05)。
所有评估参数均观察到老化条件、材料类型和精整抛光程序之间存在显著的相互作用 (P<.001)。Vita Suprinity 和 Vita Mark II 上釉组在第一次颜色测量后，L值显著升高 (P<.05)。Vita Suprinity 的 b和 C 值高于其他材料 (P<.05)。Lava Ultimate 上釉组的 ΔE值最高（ΔE=22.7），Vita Mark II 对照组的 ΔE值最低（ΔE=0.86）。
CAD-CAM 材料的光学性质可能受到材料类型和应用的表面精整和抛光程序的影响。对于 Lava Ultimate 和 Cerasmart，手动抛光似乎是更好的选择，而上釉则适用于 Vita Enamic。对于陶瓷材料，从颜色稳定性的角度来看，可以推荐手动抛光或上釉。
