J Adhes Dent. 2018;20(4):307-315. doi: 10.3290/j.jad.a40988.
To evaluate the effect of different luting strategies on the fatigue failure load (FFL) and stress distribution of Y-TZP disks luted to epoxy resin substrate.
Y-TZP disks (diameter = 10 mm; thickness = 0.7 mm) were assigned to five groups according to the luting strategy (n = 15): CC: no zirconia surface treatment, composite cement; G_CC: application of a thin glaze layer on zirconia followed by hydrofluoric acid etching and silanization, composite cement; Al_CC: air abrasion of the zirconia surface with 125-µm Al2O3 particles, composite cement; Si_CC: tribochemical silica coating (30-µm SiO2 particles), composite cement; ZP: air abrasion of the zirconia surface with 125-µm Al2O3 particles, zinc-phosphate cement. The disks were luted to the epoxy resin substrate. The FFL was evaluated by the step-test method. The load was applied in stages of 10,000 cycles, starting with 600 N, followed by increments of 200 N. Samples were loaded until fracture or to a maximum of 100,000 cycles. FFL data were submitted to Kaplan-Meier (α = 0.05) and Weibull analyses. Conditions simulating a strong and a weak bond between Y-TZP and epoxy resin were evaluated in the finite element analysis (FEA).
Luting strategy influenced the FFL (p < 0.001) and the stress distribution of Y-TZP disks. Al_CC (2227 ± 149 N) and Si_CC (2133 ± 235 N) showed the highest FFL values, followed by CC (1800 ± 293 N) and G_CC (1280 ± 147 N), while ZP showed the lowest FFL value (680 ± 101 N). The highest Weibull modulus occurred in Al_CC (18.2). A strong bond reduced the tensile stress concentration in the Y-TZP luting surface, while a weak bond between Y-TZP and the epoxy resin favored the concentration of tensile stresses.
Air abrasion with aluminum oxide and silica-coated alumina particles improves the FFL of bonded Y-TZP. Zinc-phosphate cement should be used very carefully in the cementation of zirconia restorations, since it results in lower values of FFL than composite cements.
评估不同粘固策略对粘接到环氧树脂基底上的 Y-TZP 磁盘的疲劳失效负荷 (FFL) 和应力分布的影响。
根据粘固策略将 Y-TZP 磁盘（直径=10mm；厚度=0.7mm）分为五组（n=15）：CC：不进行氧化锆表面处理，复合水泥；G_CC：在氧化锆上施加薄釉层，然后进行氢氟酸蚀刻和硅烷化处理，复合水泥；Al_CC：用 125-µm Al2O3 颗粒对氧化锆表面进行喷砂处理，复合水泥；Si_CC：使用 30-µm SiO2 颗粒进行摩擦化学硅涂层处理，复合水泥；ZP：用 125-µm Al2O3 颗粒对氧化锆表面进行喷砂处理，锌磷酸盐水泥。将磁盘粘接到环氧树脂基底上。通过逐步测试法评估 FFL。在 10000 个循环的阶段中施加负载，从 600N 开始，然后每次增加 200N。在样品断裂或达到 100000 个循环之前，对样品施加负载。FFL 数据提交给 Kaplan-Meier（α=0.05）和威布尔分析。在有限元分析（FEA）中评估了模拟 Y-TZP 和环氧树脂之间强和弱结合条件。
粘固策略影响 FFL（p<0.001）和 Y-TZP 磁盘的应力分布。Al_CC（2227±149N）和 Si_CC（2133±235N）显示出最高的 FFL 值，其次是 CC（1800±293N）和 G_CC（1280±147N），而 ZP 显示出最低的 FFL 值（680±101N）。Al_CC 的威布尔模数最高（18.2）。强结合降低了 Y-TZP 粘固表面的拉伸应力集中，而 Y-TZP 和环氧树脂之间的弱结合有利于拉伸应力的集中。
氧化铝和涂覆有氧化铝颗粒的硅砂喷砂处理提高了粘固 Y-TZP 的 FFL。在粘结氧化锆修复体时，应非常小心地使用锌磷酸盐水泥，因为它会导致比复合水泥更低的 FFL 值。
