Associate Professor, Assistant Dean of Digital Technologies, Department of Restorative Dentistry, University at Buffalo School of Dental Medicine, Buffalo, NY.
Dental student, Department of Restorative Dentistry, University at Buffalo School of Dental Medicine, Buffalo, NY.
J Prosthet Dent. 2021 Nov;126(5):693-697. doi: 10.1016/j.prosdent.2020.09.016. Epub 2020 Nov 5.
The bond between resin cement and zirconia is essential to the long-term retention of a zirconia crown. However, it is unclear if the existing methods provide a long-term bond between resin cement and zirconia.
The purpose of this in vitro study was to evaluate the effects of a zirconia etching solution on the shear bond strength between zirconia and resin cement.
Sixty yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) disks (Ø8×5 mm) were divided into 4 groups (n=15). Each group was then treated with 1 of the following methods: airborne-particle abraded with 50-μm AlO (AA); etched with zirconia etching solution (ZES); airborne-particle abraded with 50-μm AlO and then etched with ZES (AA-ZES); etched with ZES and then airborne-particle abraded with 50-μm AlO (ZES-AA). Sixty composite resin cylinders (Ø2.3×2.4 mm) were luted to the zirconia disks with a self-adhesive resin cement under constant load and then light-polymerized for 40 seconds. Specimens were stored in a 37 °C incubator in distilled water for 24 hours and then thermocycled for 1000 cycles between 5 °C and 55 °C. A universal testing machine with a crosshead speed of 0.5 mm/min was used to measure the shear force (N). The shear bond strength (MPa) was then calculated. One-way ANOVA was used to compare the mean shear bond strength among the groups (α=.05). The failure mode was evaluated by using light microscopy at ×90 magnification and categorized as an adhesive, cohesive, or mixed failure.
Mean ±standard deviation shear bond strength for AA, ZES, AA-ZES, and ZES-AA groups were 9.9 ±2.6, 8.9 ±2.9, 9.6 ±3.9, and 11.0 ±2.3 MPa, respectively. There was no significant difference among the treatment groups (P>.05).
A zirconia etching solution did not significantly improve the shear bond strength between zirconia and resin cement compared with airborne-particle abrasion with AlO.
树脂水门汀与氧化锆之间的结合对于氧化锆全冠的长期保留至关重要。然而，目前尚不清楚现有的方法是否能在树脂水门汀和氧化锆之间提供长期的结合。
本体外研究的目的是评估氧化锆蚀刻溶液对氧化锆与树脂水门汀之间剪切结合强度的影响。
将 60 个氧化钇稳定四方氧化锆多晶（Y-TZP）圆盘（Ø8×5mm）分为 4 组（n=15）。然后，每组分别采用以下方法之一进行处理：用 50-μmAlO 进行气载颗粒喷砂（AA）；用氧化锆蚀刻溶液（ZES）蚀刻；先用 ZES 蚀刻，再用 50-μmAlO 进行气载颗粒喷砂（AA-ZES）；先用 ZES 蚀刻，再用 50-μmAlO 进行气载颗粒喷砂（ZES-AA）。将 60 个复合树脂圆柱体（Ø2.3×2.4mm）用自粘树脂水门汀在恒定载荷下粘接到氧化锆圆盘上，然后用光聚合器聚合 40 秒。将标本在 37°C 孵育箱中在蒸馏水中储存 24 小时，然后在 5°C 和 55°C 之间进行 1000 次热循环。用十字头速度为 0.5mm/min 的万能试验机测量剪切力（N）。然后计算剪切结合强度（MPa）。用单因素方差分析比较组间平均剪切结合强度（α=.05）。用光学显微镜在×90 放大倍数下评估失效模式，并分为黏附性、内聚性或混合性失效。
AA、ZES、AA-ZES 和 ZES-AA 组的平均±标准偏差剪切结合强度分别为 9.9±2.6、8.9±2.9、9.6±3.9 和 11.0±2.3MPa。处理组之间无显著差异（P>.05）。
与 AlO 的气载颗粒喷砂相比，氧化锆蚀刻溶液并未显著提高氧化锆与树脂水门汀之间的剪切结合强度。
