Donmez Mustafa Borga, Olcay Emin Orkun, Demirel Münir
Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland.
Department of Prosthodontics, Faculty of Dentistry, Istinye University, 34010 İstanbul, Turkey.
Materials (Basel). 2022 Jun 5;15(11):4011. doi: 10.3390/ma15114011.
The aim of this study was to compare the load-to-failure resistance and optical properties of nano-lithium disilicate (NLD) with lithium disilicate (LDS) and zirconia-reinforced lithium silicate (ZLS) in different aging processes. Thirty crowns were milled from NLD, LDS, and ZLS (n = 10). All crowns were subjected to thermomechanical aging and loaded until catastrophic failure. Ten specimens from each material were prepared in two different thicknesses (0.7 mm and 1.5 mm, n = 5), and color coordinates were measured before and after coffee thermocycling. Color differences (ΔE00) and relative translucency parameter (RTP) were calculated. Data were analyzed by using ANOVA and Bonferroni-corrected t-tests (α = 0.05). ZLS had the highest load-to-failure resistance (p ≤ 0.002), while the difference between LDS and NLD was nonsignificant (p = 0.776). The interaction between material type and thickness affected ΔE00 (p < 0.001). Among the 0.7 mm thick specimens, ZLS had the lowest ΔE00 (p < 0.001). Furthermore, 1.5 mm thick ZLS had lower ΔE00 than that of 1.5 mm thick LDS (p = 0.036). Other than ZLS (p = 0.078), 0.7 mm thick specimens had higher ΔE00 (p < 0.001). The interaction between material type, thickness, and thermocycling affected RTP (p < 0.001). Thinner specimens presented higher RTP (p < 0.001). NLD and LDS had higher RTP than ZLS (p ≤ 0.036). However, 0.7 mm thick specimens had similar RTP after coffee thermocycling (p ≥ 0.265). Coffee thermocycling reduced the RTP values of 0.7 mm thick NLD (p = 0.032) and LDS (p = 0.008). NLD may endure the occlusal forces present in the posterior region. However, long-term coffee consumption may impair the esthetics of restorations particularly when thin NLD is used.
本研究的目的是比较纳米二硅酸锂（NLD）与二硅酸锂（LDS）和氧化锆增强硅酸锂（ZLS）在不同老化过程中的抗破坏载荷和光学性能。用NLD、LDS和ZLS（n = 10）制作了30个全冠。所有全冠均进行热机械老化处理，直至发生灾难性破坏。每种材料的10个样本制作成两种不同厚度（0.7毫米和1.5毫米，n = 5），并在咖啡热循环前后测量颜色坐标。计算颜色差异（ΔE00）和相对半透明度参数（RTP）。采用方差分析和Bonferroni校正t检验（α = 0.05）对数据进行分析。ZLS具有最高的抗破坏载荷（p≤0.002），而LDS和NLD之间的差异不显著（p = 0.776）。材料类型和厚度之间的相互作用影响了ΔE00（p < 0.001）。在0.7毫米厚的样本中，ZLS的ΔE00最低（p < 0.001）。此外，1.5毫米厚的ZLS的ΔE00低于1.5毫米厚的LDS（p = 0.036）。除ZLS外（p = 0.078），0.7毫米厚的样本具有更高的ΔE00（p < 0.001）。材料类型、厚度和热循环之间的相互作用影响了RTP（p < 0.001）。较薄的样本呈现出更高的RTP（p < 0.001）。NLD和LDS的RTP高于ZLS（p≤0.036）。然而，0.7毫米厚的样本在咖啡热循环后的RTP相似（p≥0.265）。咖啡热循环降低了0.7毫米厚的NLD（p = 0.032）和LDS（p = 0.008）的RTP值。NLD可能承受后牙区域存在的咬合力。然而，长期饮用咖啡可能会损害修复体的美观，尤其是在使用薄的NLD时。
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