This study evaluated the influence of surface treatments of resin composite substrate on the fatigue behavior of adhesively cemented lithium disilicate glass-ceramic simplified restorations. CAD/CAM lithium disilicate ceramic blocks were shaped into discs (N = 60, Ø = 10 mm; thickness = 1.0 mm). Resin composite discs (N = 60, Ø = 10 mm, thickness = 2 mm) were allocated into four groups considering the “surface treatment” factor: Ctrl – no surface treatment; Bur – grinding with coarse diamond bur (#3101G, KG Sorensen); PA – etching with 37% phosphoric acid (15 s); AA – air abrasion with alumina particles (45 μm, 10 mm distance, 2.8 bars, 10 s). The surface topography, the roughness, the fractal dimension (estimated by the box-counting method) and the contact angle analyses were performed after the surface treatments. The lithium disilicate discs were etched (5% hydrofluoric acid, 20 s), silanized and adhesively cemented (Multilink N, Ivoclar Vivadent) on the resin composite discs. The samples (bonded restoration set) were subjected to a step-stress fatigue test at 20 Hz, 10,000 cycles/step with a step-size of 100 N applied on the ceramic surface, having ceramic up and resin composite down. Fractographic analysis was performed. The fatigue data (Fatigue Failure Load – FFL; and Cycles for Failure – CFF) were analyzed by Kaplan Meier with Mantel-Cox log-rank post-hoc tests (α = 0.05). No statistical difference for fatigue performance could be found among the groups (FFL means: 820–867 N; CFF means: 53,195–61,090 cycles). The bur group showed higher surface roughness and contact angle values. The PA group has the highest average fractal dimension. Therefore, the resin composite surface treatment induces topographical changes, however, it has no effect on the fatigue behavior of lithium disilicate restorations.

本研究评估了树脂复合基材表面处理对胶结二硅酸锂微晶玻璃简化修复体疲劳行为的影响。CAD/CAM 二硅酸锂陶瓷块成型为圆盘（N = 60，Ø = 10 mm；厚度 = 1.0 mm）。考虑到“表面处理”因素，将树脂复合材料盘（N = 60，Ø = 10 mm，厚度 = 2 mm）分为四组：Ctrl - 无表面处理；车针 – 用粗金刚石车针 (#3101G, KG Sorensen) 研磨；PA – 用 37% 磷酸蚀刻（15 秒）；AA – 氧化铝颗粒的空气磨损（45 微米，10 毫米距离，2.8 条，10 秒）。在表面处理后进行表面形貌、粗糙度、分形维数（通过盒计数法估计）和接触角分析。将二硅酸锂圆盘蚀刻（5% 氢氟酸，20 秒）、硅烷化并粘合（Multilink N，Ivoclar Vivadent）在树脂复合圆盘上。样品（粘合修复组）在 20 Hz、10,000 次/步、步长为 100 N 的情况下进行步进应力疲劳试验，陶瓷表面上有陶瓷，树脂复合材料向下。进行断口分析。Kaplan Meier 使用 Mantel-Cox 对数秩事后检验 (α = 0.05) 分析了疲劳数据（疲劳失效载荷 – FFL；和失效周期 – CFF）。组间疲劳性能没有统计学差异（FFL 表示：820-867 N；CFF 表示：53,195-61,090 次循环）。车针组显示出更高的表面粗糙度和接触角值。PA 组具有最高的平均分形维数。所以，